Latest RRB JE Electrical Exam Question (Objective Questions), MCQ in English
Subjects : General Awareness, Physics & Chemistry, Basics of Computer Application, Basics of Enviroment and Pollution Control, Technical Abilities (Electrical)
Question Bank RRB JE Electrical Exam (CBT 2) - English
Kurukshetra a journal on rural development is published by
A
Ministry of Finance
B
Ministry of Information and Broadcastin
C
Ministry of Rural Development
D
Planning Commission
Question 3Single Answer
Sattriya dance form is famous in which of these states ?
A
Assam
B
Himachal Pradesh
C
Punjab
D
Tamil Nadu
Question 4Single Answer
Which of the following statements is true ?
Statement I: Indian techniques such as Rasa and Bhawa in classical dances have their origins in Bharatmuni's Natyashastra.
Statement II: Bharatanatyam has its origin in Odisha.
A
Only Statement II is true
B
Both Statement I and Statement II are true
C
Neither Statement I nor Statement II is true
D
Only Statement I is true
Question 5Single Answer
Which is the national game of Bhutan ?
A
badminton
B
basketball
C
football
D
archery
Question 6Single Answer
What is the national game of the United States of America ?
A
water polo
B
Rugby
C
Polo
D
baseball
Question 7Single Answer
When was the Constituent Assembly of India formed?
A
1946
B
1947
C
1948
D
1950
Question 8Single Answer
Who was the Chairman of the Drafting Committee of the Indian Constitution?
A
Dr. Rajendra Prasad
B
Dr. B.R. Ambedkar
C
Jawaharlal Nehru
D
Sardar Vallabhbhai Patel
Question 9Single Answer
What is the lithosphere composed of ?
A
Water and gases
B
Rocks and minerals
C
Living organisms
D
Air and gases
Question 10Single Answer
The lithosphere includes :
A
Only the Earth's crust
B
The Earth's crust and upper mantle
C
Only the Earth's mantle
D
The Earth's crust, mantle, and core
Question 11Single Answer
Who is known as the "Missile Man of India"?
A
Dr. Homi J. Bhabha
B
Dr. Vikram Sarabhai
C
Dr. APJ Abdul Kalam
D
Dr. Satish Dhawan
Question 12Single Answer
Which organization is responsible for India's space exploration programs?
A
BARC
B
ISRO
C
DRDO
D
HAL
Question 13Single Answer
Which is the longest river in India?
A
Yamuna
B
Ganges
C
Brahmaputra
D
Godavari
Question 14Single Answer
What major infrastructure project was inaugurated by PM Narendra Modi on 28 March 2026?
A
Mumbai Trans Harbour Link
B
Atal Tunnel
C
Noida International Airport
D
Chenab Bridge
Question 15Single Answer
What was the status of India-US trade relations highlighted in early 2026 leading into March developments?
A
Increased tariffs
B
Breakthrough deal reducing US tariffs on Indian goods to 18%
C
Complete trade halt
D
New sanctions
Physics & Chemistry
Question 16Single Answer
Temperature can be expressed as derived quantity in terms of
A
length and mass
B
mass and time
C
length, mass and time
D
None of these
Question 17Single Answer
Electron volt is a unit of
A
potential difference
B
charge
C
energy
D
capacity
Question 18Single Answer
Dimensions of impulse are
A
[MLT –1]
B
[MLT²]
C
[MT–2]
D
[ML–1T–3]
Question 19Single Answer
Potential is measured in
A
joule/coulomb
B
watt/coulomb
C
newton–second
D
None of these
Question 20Single Answer
One Nanometer is equal to
A
10–9m
B
10–6m
C
10–10m
D
10–3m
Question 21Single Answer
Maxwell is the unit of
A
magnetic susceptibility
B
intensity of Magnetisation
C
magnetic Flux
D
magnetic Permeability
Question 22Single Answer
Which of the following is derived physical quantity ?
A
Mass
B
Velocity
C
Length
D
Time
Question 23Single Answer
Which of the following is not a synthetic fibre:
A
Anygora
B
Rayon
C
Nylon
D
Polyster
Question 24Single Answer
Which one of the following is not contained in Portland cement ?
A
Ca3Al2O6
B
Ca3SiO5
C
Ca2SiO4
D
Ca3(PO4)2
Question 25Single Answer
What is the reson for white cement to be white ?
A
It does not contain carbon
B
It does not contain silicon
C
It does not contain iron
D
It does not contain calcium
Question 26Single Answer
Which fertilizer is assimilated directly by the plant ?
A
Super phosphate
B
Nitrolim
C
Muriate of Potash
D
Humus
Question 27Single Answer
Which of the following chemicals is used in foam fire extinguishers ?
A
Aluminium sulphate
B
Copper sulphate
C
Cobalt sulphate
D
Nickel sulphate
Question 28Single Answer
What is a mixture of potassium nitrate, powdered charcoal and sulphur called ?
A
Glass
B
Cement
C
paint
D
Gun powder
Question 29Single Answer
Which one of the following chemicals is used in beauty parlours for hair – setting ?
A
Sulphur based
B
Phosphorus based
C
Silicon based
D
Iron based
Question 30Single Answer
Which one of the following is used as a mordant in dyeing and tanning industry ?
A
Magnesium oxide
B
Magnesium carbonate
C
Magnesium chloride
D
Magnesium sulphate
Basics of Computer Application
Question 31Single Answer
Which Windows interface element typically appears to display information, a warning, an error message, or a request for confirmation?
A
Window
B
Pop-up menu
C
Message box
D
Taskbar
Question 32Single Answer
What is active desktop ?
A
a term that is synonymous with viewing your desktop as web page
B
a feature to customize your desktop to display informating you can update from the internet
C
both a and b above mentioned
D
A software
E
None of these
Question 33Single Answer
What is meant by an active window?
A
A window that is minimized
B
The window currently receiving user input
C
Any window currently open
D
The window opened first
Question 34Single Answer
What was America Online (AOL) primarily known for during the early popularization of consumer Internet access?
A
An online service providing Internet access and proprietary online content
B
A computer operating system
C
A spreadsheet application
D
A database management system
Question 35Single Answer
An application is
A
word processing, accounting and engineering programs are example of application programs
B
computer program designed to enable users to perform specific job functions
C
Both a and b above mentioned
D
a document
E
None of these
Question 36Single Answer
Which of the following programs enables you to calculate numbers related to rows and columns?
A
Window program
B
Spreadsheet program
C
Graphics program
D
Word program
E
None of these
Question 37Single Answer
The term Briefcase is used for
A
a special folder on the windows desktop used to keep documents up to date when shared between computers
B
a window that us currently open
C
A folder which keeps deleted, files for a while and can be retrieved from it
D
All of the above
E
None of these
Question 38Single Answer
In a graphical user interface, what is a button primarily used for?
A
Executing a command or initiating an action
B
Permanently storing data
C
Displaying the computer's IP address
D
Formatting a disk automatically
Question 39Single Answer
A channel (in windows terminology) is
A
a widely used online service that offers access to the internet
B
a specialized web site designed to work with the windows 98 subscribing feature to automatically download information from the internet and store it on your computer for later viewing
C
an area on the computer memory where text or graphics can be temporarily stored
D
All of the above
E
None of these
Question 40Single Answer
What does a checked checkbox generally indicate in a graphical user interface?
A
The associated option is enabled or selected
B
The application has closed
C
The file has been deleted
D
The computer is offline
Basics of Enviroment and Pollution Control
Question 41Single Answer
Which of the following defines an ecosystem?
A
A group of similar organisms
B
The interaction between living organisms and their physical environment
C
A community of plants
D
A population of animals
Question 42Single Answer
What is biodiversity?
A
The number of individuals in a population
B
The variety of life in a particular habitat or ecosystem
C
The amount of rainfall in a region
D
The average temperature of an area
Question 43Single Answer
Which of the following is an abiotic factor?
A
Bacteria
B
Plants
C
Sunlight
D
Animals
Question 44Single Answer
Which of the following is a biotic factor?
A
Water
B
Soil
C
Fungi
D
Air
Question 45Single Answer
What is sustainable use of natural resources?
A
Using resources without considering future needs
B
Using resources in a way that meets current needs without compromising future availability
C
Exploiting resources for maximum profit
D
Ignoring resource depletion
Question 46Single Answer
Which of the following is an example of a natural resource?
A
Plastic
B
Steel
C
Coal
D
Synthetic fibers
Question 47Single Answer
What is the role of decomposers in an ecosystem?
A
To produce food
B
To consume living organisms
C
To break down dead organic matter
D
To provide shelter
Question 48Single Answer
Which level of the food chain do plants occupy?
A
Primary consumers
B
Secondary consumers
C
Producers
D
Decomposers
Question 49Single Answer
What is the significance of biodiversity?
A
It increases vulnerability to diseases
B
It provides ecosystem stability and resilience
C
It reduces the number of natural resources
D
It has no impact on the environment
Question 50Single Answer
What is the primary source of energy for most ecosystems?
A
Chemical energy
B
Geothermal energy
C
Solar energy
D
Nuclear energy
Important Questions Package
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Technical Abilities (Electrical)
Question 51Single Answer
Resistance switching is normally resorted in case of
A
Air blast CB
B
Bulk oil CB
C
Minimum oil CB
D
All types of CB
Question 52Single Answer
By transmitting power at high voltage
A
it will give poor voltage regulation
B
it will give better voltage regulation
C
it will not effect voltage regulation
D
None of these
Question 53Single Answer
Which statement about the daily load curve is valid ?
A
The area under the curve gives the average demand
B
The ratio of the area under the curves to the total area of rectangle in which it is contained gives the load factor for the day
C
The peak of the curve gives the installed capacity of the plant
D
The area of the curves divided by the number of hours gives load factor
Question 54Single Answer
High voltage Schring bridge is used to measure
A
large capacitance without additional element
B
small capacitance without additional element
C
medium value capacitance
D
None of these
Question 55Single Answer
Draw - in - system of laying underground cables has the drawback (s) of
A
higher cost
B
reduced current carrying capacity of the cables
C
requirements of much deeper and wider trenches
D
repairs, alterations or additions difficult
E
all of the above except
Question 56Single Answer
Surge impedance of a transmission line is
A
independent of its length
B
dependent on its length
C
independent on its temperature
D
none of the above
Question 57Single Answer
If two synchronous generators connected in parallel loose synchronism, it will lead to
A
stalling of generators
B
wild fluctuations in current
C
wild fluctuations in current and voltage
D
None of these
Question 58Single Answer
A differential relay responds to
A
algebraic difference of two or more similar electrical quantities
B
vector difference of two or more similar electrical quantities
C
algebraic difference between two currents
D
algebraic difference between two voltages
Question 59Single Answer
The conductor carries more current on the surface in comparison to its core. This phenomenon is called the
A
Skin effect
B
Corona
C
Ferranti effect
D
Lenz's effect
Question 60Single Answer
A booster is connected in
A
series with the feeder
B
parallel with the feeder
C
both (a) and (b) are correct
D
none of these
Question 61Single Answer
Fuses have got advantages of
A
cheapest type of protection
B
inverse time - current characteristic
C
no maintenance
D
current limiting effect under short - circuit conditions
E
all of the above
Question 62Single Answer
The power transmitted will be maximum when
A
line reactance is high
B
corona losses are minimum
C
sending end voltage is more
D
receiving end voltage is more
Question 63Single Answer
The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The load factor of the consumer is
A
0.75
B
0.375
C
1.33
D
None of these
Question 64Single Answer
In a transformer, the exciting current will be in phase quadrature with the impressed voltage provided
A
only the leakage impedance drop is ignored
B
only the core loss is ignored
C
both the leakage impedance drop and the core loss are ignored
D
only the no - load copper loss is ignored
Question 65Single Answer
Which of the following techniques is used for the measurements of a.c. high frequency voltages ?
A
Peak voltmeter
B
Series resistance mircro - ammeter
C
Resistance potential divider
D
All of these
Question 66Single Answer
Use of additional shunt capacitor can be made for increasing the capability of line as it
A
reduces surge impedance Z0
B
increases phase shift β
C
increase in α
D
all of the above
Question 67Single Answer
The sag of a transmission line is least affected owing to
A
weight of the conductor
B
current through the conductor
C
atmospheric temperature
D
ice deposited on the conductor
Question 68Single Answer
In case of Impulse Thermal break down of solid insulating materials, the critical electric field is proportional to
A
critical absolute temperature
B
square of critical absolute temperature
C
square of T0
D
none of these
Question 69Single Answer
The insulation of the modern EHV lines is designed based on
A
corona
B
switching voltages
C
lightning voltage
D
all of these
Question 70Single Answer
For constant voltage transmission, the voltage drop along the line is maintained constant by installing
A
capacitors
B
inductors
C
resistors
D
synchronous phase modifiers at the receiving end
Question 71Single Answer
AC network analyser is employed for solving the problems of
A
load flow
B
load flow and stability
C
load flow and short - circuit
D
load flow, stability and short - circuit
Question 72Single Answer
The change in excitation in an alternator connected to an infinite line provides a corresponding change in
A
terminal voltage
B
speed of rotor
C
power generated
D
power factor
Question 73Single Answer
Different types of insulators used for transmission lines are
A
pin type only
B
suspension type only
C
strain type only
D
pin type, suspension type and shackle type
Question 74Single Answer
The conductor connecting consumer's terminals to the distributor is called the
A
feeder
B
distributor
C
service main
D
none of the above
Question 75Single Answer
Which of the following method or techniques can be used for the measurement of high d.c. voltages ?
A
Generating voltmeter
B
Electrostatic voltmeter
C
Peak voltmeter
D
Half effect generators
Question 76Single Answer
The ripple voltage in dc output is small if
A
frequency of supply voltage is small
B
the filtering capacitor is small
C
load current is small
D
none of these
Question 77Single Answer
The voltage measurements using uniform spark gap are
A
affected by dust particles
B
affected by polarity of supply
C
affected by temperature
D
none of these
Question 78Single Answer
Neutral earthing is provided for
A
the safety of personnel from electric shock
B
the safety of equipment and personnel against lightning and voltage surges
C
reducing the voltage stress on lines and equipment with respect to earth under various operating and fault conditions
D
controlling the earth fault currents for protective relaying
E
both (c) and (d)
Question 79Single Answer
The function of Lightning arrester is
A
to limiting the short - circuit fault current
B
to provide path to high voltage surge to earth
C
to reduce arcing
D
none of these
Question 80Single Answer
In which of the following cases are delay fuses used ?
A
For the protection of light circuits
B
For the protection of power out - let circuits
C
For the protection of fluorescent lamps
D
For the protection of motors
Question 81Single Answer
In order to improve the voltage profile of the line, compensation is resorted by providing
A
capacitors at the receiving end
B
reactors at the receiving end
C
resistors at the receiving end
D
none of these
Question 82Single Answer
Skin effect in conductor is proportional to
A
(diameter of conductor) 1/2
B
diameter of conductor
C
(diameter of conductor)2
D
(diameter of conductor)4
Question 83Single Answer
The function of steel wire in an ACSR conductor is to
A
compensate for skin effect
B
take care of surges
C
provide additional mechanical strength
D
reduce inductance
Question 84Single Answer
A fault is more severe from the view point of RRRV if it is a
A
Short length fault
B
Medium length line fault
C
Long length line fault
D
None of these
Question 85Single Answer
Protective resistance to be connected between the sphere gap and the test equipment is required while measuring
A
power frequency and higher frequency a.c. voltage
B
power frequency and impulse voltage
C
all kinds of voltages
D
none of these
Question 86Single Answer
Series capacitor is used in a transmission line to
A
compensate the voltage drop
B
reduce line loss
C
limit short circuit current
D
improve load power factor
Question 87Single Answer
The passive element that is used as interconnecting element for the stable operation of interconnected system is
A
reactor
B
resistor
C
capacitor
D
resistor and capacitor
Question 88Single Answer
Corona loss in a transmission line is dependent on
A
diameter of the conductor
B
material of the conductor
C
height of the conductor
D
none of these
Question 89Single Answer
In a minimum oil circuit breaker the oil is used
A
to act as circuit breaking medium only
B
for circuit breaking and providing insulation
C
for providing insulation only
D
for none of the above purposes
Question 90Single Answer
Skin effect is
A
proportional to frequency
B
proportional to square of frequency
C
inversely proportional to frequency
D
independent of frequency
Question 91Single Answer
Rated making capacity of breaker is equal to
A
X rated symmetrical breaking capacity
B
2.55 X rated symmetrical breaking capacity
C
1 X rated symmetrical breaking capacity
D
none of these
Question 92Single Answer
The main reason for using high voltage for long distance power transmission is
A
reduction in transmission losses
B
reduction in time of transmission
C
increase in system reliability
D
none of the above
Question 93Single Answer
Bus - coupler is very essential in
A
single bus - bar arrangement
B
ring bus - bar arrangement
C
double bus, double breaker arrangement
D
main and transfer bus
Question 94Single Answer
With the rise in temperature, the insulation resistivity
A
remains unchanged
B
decreases linearly
C
increases linearly
D
reduces exponentially
Question 95Single Answer
The effect of bonding the cable is
A
to increase the effective resistance and inductance
B
to increase the effective resistance but reduce inductance
C
to reduce the effective resistance and inductance
D
to reduce the effective resistance but increase the inductance
Question 96Single Answer
Increase in temperature in overhead transmission lines causes
A
increase in stress and length
B
decrease in stress and length
C
decrease in stress but increase in length
D
none of the above
Question 97Single Answer
The insulation resistance of the cable decreases with the
A
increase in length of cable
B
decrease in length of cable
C
electric stresses
D
none of these
Question 98Single Answer
Corona has the disadvantage(s) of
A
power loss
B
interference with neighbouring communication circuits
C
introducing the harmonics, predominately third harmonics, into the transmission lines
D
all of the above
Question 99Single Answer
In a load duration curve for an intergrated power system the uppermost crest represents the energy contributed by
A
base power stations
B
major thermal stations
C
peaking hydro or gas turbine stations
D
non - conventional power stations
Question 100Single Answer
At bridge crossing and near the railway track ternary lead cables are used because they
A
are of high tensile strength
B
are of low coefficient of thermal expansion
C
are of low specific gravity
D
can withstand shocks and vibrations
Question 101Single Answer
The heat produced at the contact point owing to flow of electric current is least affected by
A
temperature of the surrounding medium
B
contact resistance
C
magnitude of electric current flowing
D
duration of flow of current
Question 102Single Answer
A stationary alternator should not be connected to the live bus - bar because
A
it is likely to operate as a synchronous motor
B
it will get short - circuited
C
it will reduce bus - bar voltage
D
all of the above
Question 103Single Answer
In a transmission system the feeder supplies power to
A
transformer substations (step - up)
B
service mains
C
distributors
D
all of the above
Question 104Single Answer
For a given amount of power to be transmitted over a certain distance with fixed power loss, the volume of copper required is
A
directly proportional to voltage
B
inversely proportional to voltage
C
inversely proportional to the square of voltage and pf of the load
D
directly proportional to the square of the voltage and pf of the load
Question 105Single Answer
Power despatch through a line can be increased by
A
installing series capacitors
B
installing shunt capacitors
C
installing series reactor
D
installing shunt reactor
Question 106Single Answer
In the figure shown which curve represents the variation of cost of generation per kWh with the load factor, for a thermal power plant ?
A
Curve A
B
Curve B
C
Curve C
D
Curve D
Question 107Single Answer
Under 'no load conditions the current in a transmission line is because of
A
capacitance effect
B
corona effect
C
proximity effect
D
back flow from earth
Question 108Single Answer
The only advantage of corona is that it
A
produces a pleasing luminous glow
B
makes line current sinusoidal
C
works as a safety valve for surges
D
ozone gas is produced
Question 109Single Answer
Earth wires are made of
A
copper
B
aluminium
C
iron
D
galvanised stranded steel
Question 110Single Answer
The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The demand factor of the consumer is
A
0.75
B
0.375
C
1.33
D
none of the above
Question 111Single Answer
A lightning arrester connected between the line and earth in a power system
A
protects the terminal equipment against travelling surges
B
protects the terminal equipment against direct lightning stroke
C
suppresses high frequency oscillations in the line
D
reflects back the travelling waves approaching it
Question 112Single Answer
Oil filled cables have the advantage(s) of
A
smaller overall size
B
most perfect impregnation
C
easy detection of fault
D
all of the above
Question 113Single Answer
A bus coupler circuit breaker is utilised in a substation for
A
joining the transmission line with station bus - bar
B
joining main and transfer bus in a substation
C
joining the generator with transfer
D
joining the neutral of the generator with earth
Question 114Single Answer
The fluids used in circuit breakers should be of
A
high dielectric strength and thermal stability
B
non - inflammability
C
are extinguishing ability
D
all of the above
Question 115Single Answer
Feeder is designed mainly from the point of view of
A
its current carrying capacity
B
voltage drop in it
C
operating voltage
D
operating frequency
Question 116Single Answer
Power output per unit volume of an MHD generator is proportional to
A
specific electrical conductivity of gas
B
square of the magnetic field strength
C
square of the fluid velocity
D
all of the above
Question 117Single Answer
Increase in frequecy of transmission line causes
A
no change in line resistance
B
increase in line resistance
C
decrease in line resistance
D
decrease in line series reactance
Question 118Single Answer
A dc series generator can excite itself
A
only on zero load current
B
only when load current is not zero
C
irrespective of the value of load current
D
none of the above
Question 119Single Answer
Thermal relays are used for protection of motors against over - current owing to
A
short - circuits
B
heavy loads
C
earth fault
D
all of these
Question 120Single Answer
Transmission efficiency of a transmission line increases with the
A
decrease in power factor and voltage
B
increase in power factor and voltage
C
increase in power factor but decrease in voltage
D
increase in voltage but decrease in power factor
Question 121Single Answer
While using air - blast circuit breaker, current chopping is a phenomenon often observed when
A
a long overhead line is switched off
B
a bank of capacitors is switched off
C
a trasformer on no - load is switched off
D
none of these
Question 122Single Answer
The contact resistance of a circuit breaker is about
A
20 Ω
B
2 Ω
C
20 mΩ
D
20 μΩ
Question 123Single Answer
Metallic shielding is provided on underground cables to
A
reduce thermal resistance
B
reduce corona effect
C
control the electrostatic voltage stress
D
all of the above
Question 124Single Answer
The most economical limit of power factor correcting is governed by
A
original power factor
B
relative costs of the supply and power factor correction equipment
C
both (a) and (b)
D
none of the above
Question 125Single Answer
A short - circuit current is identified by
A
heavy current flow
B
voltage rise
C
voltage drop
D
none of these
Question 126Single Answer
Which of the following materials is not used for transmission and distribution of electrical power ?
A
Tungsten
B
Copper
C
Aluminium
D
Cadmium copper
Question 127Single Answer
Which of the following alternators will have maximum number of poles ?
A
Alternator coupled to hydraulic turbine
B
Alternator coupled to steam turbine
C
Alternator coupled to gas turbine
D
All will have same number of poles
Question 128Single Answer
In humid weather, the corona occurs at a voltage
A
much less than the needed in fair weather
B
much higher than that needed in fair weather
C
equal to that needed in fair weather
D
none of the above
Question 129Single Answer
Short - circuit currents are due to
A
single phase to earth fault
B
phase to phase fault
C
all the three phases to earth fault
D
all the three phases short - circuited
E
any of the above
Question 130Single Answer
Over - current protection respond to
A
increase in current above pick - up value
B
single line to earth faults
C
double line to earth faults
D
all of the above
Question 131Single Answer
A fuse is
A
always connected in series with the circuit
B
always connected in parallel with the circuit
C
normally connected in series with the circuit
D
none of these
Question 132Single Answer
Standard impulse testing of power transformer requires
A
one application of chopped wave followed by one application of full - wave
B
two applications of chopped wave followed by an application of a full - wave
C
one application of chopped wave followed by two application of a full - wave
D
none of these
Question 133Single Answer
The presence of earth in case of overhead lines
A
increases the capacitance
B
increases the inductance
C
decreases the capacitance and increases the inductance
D
does not effect any of the line constants
Question 134Single Answer
Partial discharge measurement on a cable gives
A
p.f of the cable
B
loss angle of the cable
C
location of fault
D
None of these
Question 135Single Answer
Any leakage of air into the condenser destroys the vacuum and causes
A
an increase in air pressure in the condenser limiting the useful heat drop in the steam turbine
B
lowering of the partial pressure of the steam and of the saturation temperature along with it
C
undercooling of the condensate more severe
D
all of the above
Question 136Single Answer
The intersheaths in cables are used to
A
provide proper stress distribution
B
minimize the stress
C
provide protection against moisture and voltage surges
D
provide protection against current and voltage surges
Question 137Single Answer
The string efficiency of insulators can be increased by
A
reducing the number of strings
B
increasing the number of strings
C
correct grading of insulators of various strings
D
none of these
Question 138Single Answer
Which one of the following statements regarding the position of minimum copper loss in a phase of rotary convertor is true ?
A
The position of minimum copper loss is in the middle of the phase whatever may be the power factor
B
The position of minimum copper loss varies with the variation in power factor and this position is displaced from the middle of the phase by the power factor angle
C
The position of minimum copper loss is the tapping point whatever may be the power factor
D
None of the above
Question 139Single Answer
In order to have lower cost of electrical generation
A
the load factor and diversity factor should be high
B
the load factor should be low but diversity factor high
C
the load factor should be high but diversity factor low
D
the load factor and diversity factor should be low
Question 140Single Answer
The stability limit of system is defined as the value of power below which
A
the system is stable and above which also stable
B
the system is unstable and above which it is stable
C
the system is stable and above which it is unstable
D
none of these
Question 141Single Answer
Swing equation represents
A
the variation of power with respect to time
B
the variation of torque angle with respect to time
C
the variation of input power with respect to time
D
none of these
Question 142Single Answer
In case of Impulse Thermal breakdown of insulating materials, the critical time to breakdown is
A
proportional to critical electric field
B
inversely proportional to critical electric field
C
proportional to square of critical absolute temperature
D
none of these
Question 143Single Answer
Economiser in a steam power plant
A
improves the boiler efficiency by 10 - 12 %
B
saves fuel consumption by 5 - 15 %
C
becomes a necessity for pressure
D
none of these
Question 144Single Answer
Conductor configuration determine
A
inductance
B
sag
C
voltage
D
current
Question 145Single Answer
If the length of the arc of circuit breaker increases, its resistance
A
be extinguished
B
decreases
C
remains same
D
none of these
Question 146Single Answer
If the frequency of a transmission system is changed from 50 Hz to 100 Hz, the string efficiency
A
will increase
B
will decrease
C
remain unchanged
D
may increase or decrease depending on the line parameters
Question 147Single Answer
The pressurised water reactors employ
A
light water and natural uranium
B
heavy water and enriched uranium
C
light water and enriched uranium
D
none of the above combinations
Question 148Single Answer
The suitable turbine used for harnessing tidal power is
A
Francis turbine
B
Pelton turbine
C
Kaplan turbine
D
None of these
Question 149Single Answer
In an AC Transmission line, difference in phase of voltages at the two ends of the line is due to
X rated symmetrical breaking capacity