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Latest OPSC Assistant Industries Officer Exam Question (Objective Questions), MCQ in English

Subjects : Basic Engineering

Question Bank OPSC Assistant Industries Officer Exam Paper 2 - English
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Basic Engineering

Question 1Single Answer
At temperature of 298 Kelvin, Silicon is not suitable for most-electronic applications, due to small amount of conductivity. This can be altered by
  1. A
    Gettering
  2. B
    Doping
  3. C
    Squeezing
  4. D
    Sintering
Question 2Single Answer
By doping Germanium with Gallium, the types of semi-conductors formed are
1. N type
2. P type
3. Intrinsic
4. Extrinsic
  1. A
    1 and 4
  2. B
    2 and 4
  3. C
    1 and 3
  4. D
    2 and 3
Question 3Single Answer
An n-type of silicon can be formed by adding impurity of:
1. Phosphorous
2. Arsenic
3. Boron
4. Aluminum 
Which of the above are correct ?
  1. A
    1 and 2
  2. B
    2 and 3
  3. C
    3 and 4
  4. D
    1 and 4
Question 4Single Answer
According to Einstein’s relationship for a semiconductor, the ratio of diffusion constant to the mobility of the charge carriers is
  1. A
    Variable and is twice the volt equivalent of the temperature
  2. B
    Constant and is equal to the volt equivalent of the temperature
  3. C
    Equal to two and is twice the volt equivalent of the temperature
  4. D
    Equal to one and is equal to the volt equivalent of the temperature
Question 5Single Answer
Swept-out voltage in PIN diode happens when PIN diode is
  1. A
    Forward biased and the thickness of the depletion layer decreases till I-region becomes free of mobile carriers
  2. B
    Reverse biased and the thickness of the depletion layer increases till I-region becomes free of mobile carriers
  3. C
    Forward biased and the thickness of the depletion layer increases till I-region becomes free of mobile carriers
  4. D
    Reverse biased and the thickness of the depletion layer decreases till I-region becomes free of mobile carriers
Question 6Single Answer
The number of holes in an N-type silicon with intrinsic value 1.5 × 1010/cm3 and doping concentration of 1017/cm3, by using mass-action law is
  1. A
    6.67 × 106/cc
  2. B
    4.44 × 10-25/cc
  3. C
    1.5× 10-24/cc
  4. D
    2.25 × 103/cc
Question 7Single Answer
A tunnel-diode is best suited for
  1. A
    Very low frequencies
  2. B
    50 Hz
  3. C
    100 Hz
  4. D
    Microwave frequencies
Question 8Single Answer
Small recovery time of a diode is most significant for
  1. A
    Line-frequency rectification
  2. B
    Switching operations
  3. C
    High-frequency rectifications and switching operations
  4. D
    Low-frequency rectifications and switching operations
Question 9Single Answer
In JFET, when operated above the pinch-off voltage, the
  1. A
    Depletion region becomes smaller
  2. B
    Drain current starts decreasing
  3. C
    Drain current remains practically constant
  4. D
    Drain current increases steeply
Question 10Single Answer
Thermal runaway is not possible in FET because, as the temperature of FET increases
  1. A
    The drain current increases
  2. B
    The mobility of charge carriers decreases
  3. C
    The mobility of charge carriers increases
  4. D
    The transconductance increases
Question 11Single Answer
Consider the following statements regarding an N-P-N Bipolar Junction Transistor:
1. Emitter diode is forward biased and collector diode is reverse biased
2. Emitter has many free electrons
3. Free electrons are injected into base and pass through collector
4. Depletion layers around junction J1 and J2 of BJT are widened 
    Which of the above statements are correct?
  1. A
    1, 2 and 4
  2. B
    1, 3 and 4
  3. C
    2, 3 and 4
  4. D
    1, 2 and 3
Question 12Single Answer
A freewheeling diode T phase controlled rectifier
  1. A
    Improves the line power factor
  2. B
    Enables inverse operation
  3. C
    Is responsible for additional reactive power
  4. D
    Is responsible for additional harmonics
Question 13Single Answer
The zeners incorporated within the encapsulations of some MOSFETs are meant for
  1. A
    Reducing the cost
  2. B
    Biasing the gate circuit
  3. C
    Self-protecting the device against transients
  4. D
    None of the above
Question 14Single Answer
When UJT is used for triggering an SCR, the wave-shape of the signal obtained from UJT circuit is
  1. A
    Sine wave
  2. B
    Saw tooth wave
  3. C
    Trapezoidal wave
  4. D
    Square wave
Question 15Single Answer
Darlington pairs are frequently used in linear ICs because, they
  1. A
    Do not require any capacitors or inductors
  2. B
    Have enormous impedance transformation capability
  3. C
    Can be readily formed/hooked from two adjacent transistors
  4. D
    Resemble emitter follower
Question 16Single Answer
What will be the depth of penetration of the plunger in Vicat Apparatus (IS : 5513 - 1976) from the bottom of the Vicat Mould, when the cement paste is tested for standard consistency, according to IS 4031 – 1988 ?
  1. A
    11 to 15 mm
  2. B
    8 to 10 mm
  3. C
    15 to 17 mm
  4. D
    5 to 7 mm
Question 17Single Answer
Two sewer pipelines A and B (having the same diameter and made of the same material) are laid at a bed slope of 1 in 225 and 1 in 625, respectively. Determine the ratio of their carrying capacities (QA to QB) .
  1. A
  2. B
  3. C
    1
  4. D
Question 18Single Answer
Select the correct statement with respect to an over - reinforced cement concrete section under the working stress method .
  1. A
    The compressive stress in steel reaches the allowable limit before the maximum tensile stress in concrete reaches the allowable limit
  2. B
    Tensile steel stress and maximum compressive stress in concrete simultaneously reach their allowable limits
  3. C
    The allowable limiting stress is reached in concrete before the steel stress reaches the limiting value
  4. D
    The tensile stress in steel reaches the allowable limit before the maximum compressive stress in concrete reaches the allowable limit
Question 19Single Answer
A cantilever beam of span L is built - in at the support. It is restrained against lateral deflection and torsion at the free end. The effective length of compression flange for the beam as per IS 800 : 2007 is
  1. A
    0.5 L
  2. B
    0.85 L
  3. C
    2 L
  4. D
    0.75 L
Question 20Single Answer
What is the principle of plane surveying ?
  1. A
    Working from part to whole
  2. B
    Working from point to area
  3. C
    Working from angle to volume
  4. D
    Working from whole to part
Question 21Single Answer
According is IS 5968 : 1987, the minimum radius of radius of curve to be provided in the alignment of unlined canals carrying a discharge of less than 30 cumecs up to 15 cumecs is :
  1. A
    100 m
  2. B
    1000 m
  3. C
    600 m
  4. D
    150 m
Question 22Single Answer
A Pelton wheel is to be designed for a pitch diameter of 1 m and jet diameter of 0.1 m. The number of buckets on the runner computed by Taygun’s formula is :
  1. A
    20
  2. B
    25
  3. C
    15
  4. D
    10
Question 23Single Answer
What is the effect of fly ash in concrete ?
  1. A
    Reduces the secondary hydration process
  2. B
    Increases the heat of hydration
  3. C
    Increases the amount of air entrainment
  4. D
    Reduces the heat of hydration
Question 24Single Answer
As per IS 456 : 2000, the minimum grade of concrete to be used for plain concrete and reinforced concrete, respectively, in concrete works exposed directly along the sea coast are :
  1. A
    M 20 and M 30
  2. B
    M 20 and M 25
  3. C
    M 22 and M 40
  4. D
    M 15 and M 25
Question 25Single Answer
Identify the property that changes as a function of the geometrical dimensions of a section in structural materials :
  1. A
    Mass density
  2. B
    Moment of inertia
  3. C
    Poission’s ratio
  4. D
    Modulus of elasticity
Question 26Single Answer
As per IRC (Indian Roads Congress) recommendation, what will be the designed stopping sight distance (in metres) at the vehicle speed of 80 km/h on a rural highway ?
  1. A
    120
  2. B
    140
  3. C
    70
  4. D
    60
Question 27Single Answer
No deduction is made in the quantity estimation for plastering work in cement mortar for openings having size up to :
  1. A
    0.5 m2
  2. B
    1.0 m2
  3. C
    3 m2
  4. D
    0.75 m2
Question 28Single Answer
What is the height of slump cone mould used for testing the workability of the concrete ?
  1. A
    20 cm
  2. B
    10 cm
  3. C
    30 cm
  4. D
    25 cm
Question 29Single Answer
Select the correct option with regard in the following statements (S1, S2) pertaining to pavements .
S1 : Present serviceability index is used for the functional evaluation of pavement surface condition
S2 : Rigid pavements are less affected by temperature variations than flexible pavements
  1. A
    Statements S1 is true and Statement S2 is false
  2. B
    Both statements S1 and S2 are false
  3. C
    Statements S1 is false and Statement S2 is true
  4. D
    Both statements S1 and S2 are true
Question 30Single Answer
If the quadrantal bearing of a line AB is S 31'35' E, then its whole circle bearing is equal in :
  1. A
    121o25'
  2. B
    148o25'
  3. C
    58o25'
  4. D
    211o25'
Question 31Single Answer
Resistance switching is normally resorted in case of
  1. A
    Air blast CB
  2. B
    Bulk oil CB
  3. C
    Minimum oil CB
  4. D
    All types of CB
Question 32Single Answer
By transmitting power at high voltage
  1. A
    it will give poor voltage regulation
  2. B
    it will give better voltage regulation
  3. C
    it will not effect voltage regulation
  4. D
    None of these
Question 33Single Answer
Which statement about the daily load curve is valid ?
  1. A
    The area under the curve gives the average demand
  2. 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
  3. C
    The peak of the curve gives the installed capacity of the plant
  4. D
    The area of the curves divided by the number of hours gives load factor
Question 34Single Answer
High voltage Schring bridge is used to measure
  1. A
    large capacitance without additional element
  2. B
    small capacitance without additional element
  3. C
    medium value capacitance
  4. D
    None of these
Question 35Single Answer
Draw - in - system of laying underground cables has the drawback (s) of
  1. A
    higher cost
  2. B
    reduced current carrying capacity of the cables
  3. C
    requirements of much deeper and wider trenches
  4. D
    repairs, alterations or additions difficult
  5. E
    all of the above except
Question 36Single Answer
Surge impedance of a transmission line is
  1. A
    independent of its length
  2. B
    dependent on its length
  3. C
    independent on its temperature
  4. D
    none of the above
Question 37Single Answer
If two synchronous generators connected in parallel loose synchronism, it will lead to
  1. A
    stalling of generators
  2. B
    wild fluctuations in current
  3. C
    wild fluctuations in current and voltage
  4. D
    None of these
Question 38Single Answer
A differential relay responds to
  1. A
    algebraic difference of two or more similar electrical quantities
  2. B
    vector difference of two or more similar electrical quantities
  3. C
    algebraic difference between two currents
  4. D
    algebraic difference between two voltages
Question 39Single Answer
The conductor carries more current on the surface in comparison to its core. This phenomenon is called the
  1. A
    Skin effect
  2. B
    Corona
  3. C
    Ferranti effect
  4. D
    Lenz's effect
Question 40Single Answer
A booster is connected in
  1. A
    series with the feeder
  2. B
    parallel with the feeder
  3. C
    both (a) and (b) are correct
  4. D
    none of these
Question 41Single Answer
Fuses have got advantages of
  1. A
    cheapest type of protection
  2. B
    inverse time - current characteristic
  3. C
    no maintenance
  4. D
    current limiting effect under short - circuit conditions
  5. E
    all of the above
Question 42Single Answer
The power transmitted will be maximum when
  1. A
    line reactance is high
  2. B
    corona losses are minimum
  3. C
    sending end voltage is more
  4. D
    receiving end voltage is more
Question 43Single 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
  1. A
    0.75
  2. B
    0.375
  3. C
    1.33
  4. D
    None of these
Question 44Single Answer
In a transformer, the exciting current will be in phase quadrature with the impressed voltage provided
  1. A
    only the leakage impedance drop is ignored
  2. B
    only the core loss is ignored
  3. C
    both the leakage impedance drop and the core loss are ignored
  4. D
    only the no - load copper loss is ignored
Question 45Single Answer
Which of the following techniques is used for the measurements of a.c. high frequency voltages ?
  1. A
    Peak voltmeter
  2. B
    Series resistance mircro - ammeter
  3. C
    Resistance potential divider
  4. D
    All of these
Question 46Single Answer
Use of additional shunt capacitor can be made for increasing the capability of line as it
  1. A
    reduces surge impedance Z0
  2. B
    increases phase shift β
  3. C
    increase in α
  4. D
    all of the above
Question 47Single Answer
The sag of a transmission line is least affected owing to
  1. A
    weight of the conductor
  2. B
    current through the conductor
  3. C
    atmospheric temperature
  4. D
    ice deposited on the conductor
Question 48Single Answer
In case of Impulse Thermal break down of solid insulating materials, the critical electric field is proportional to
  1. A
    critical absolute temperature
  2. B
    square of critical absolute temperature
  3. C
    square of T0
  4. D
    none of these
Question 49Single Answer
The insulation of the modern EHV lines is designed based on
  1. A
    corona
  2. B
    switching voltages
  3. C
    lightning voltage
  4. D
    all of these
Question 50Single Answer
For constant voltage transmission, the voltage drop along the line is maintained constant by installing
  1. A
    capacitors
  2. B
    inductors
  3. C
    resistors
  4. D
    synchronous phase modifiers at the receiving end
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