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Objective Questions

Latest IOCL JE Electrical Exam Question (Objective Questions), MCQ in English

Subjects : Domain Knowledge (Electrical), Quantitative Aptitude, Logical Reasoning, Verbal Ability of English Language

Question Bank IOCL Junior Engineer (Electrical) Exam - English
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Domain Knowledge (Electrical)

Question 1Single Answer
When a very small amount of higher conducting metal is added to a conductor, its conductivity will 
  1. A
    increase
  2. B
     decrease
  3. C
    remain the same 
  4. D
    increase or decrease depending on the impurity
Question 2Single Answer
A semiconductor differs from a conductor in that it has
  1. A
    Only one path for the free electrons in the valence band
  2. B
    Only one path for holes in the conduction band
  3. C
    Two paths followed by free electrons and holes, one an ordinary path in the conduction band and the other one an extraordinary path in the valence band, respectively 
  4. D
    Two paths followed by free electrons and holes, one an extraordinary path in the conduction band and the other one an ordinary path in valence band, respectively 
Question 3Single Answer
Which of the following circuits is used for converting a sine wave into a square wave?
  1. A
    Monostablemultivibrator
  2. B
    Bistablemultivibrator
  3. C
    Schmitt trigger circuit 
  4. D
    Darlington complementary pair
Question 4Single Answer
If a square matrix of order 100 has exactly 15 distinct eigenvalues, then the degree of the minimum polynomial is 
  1. A
    At least 15 
  2. B
    At most 15 
  3. C
    Always 15 
  4. D
    Exactly 100
Question 5Single Answer
For high speed reading and storing of information in a computer, the core shall be of 
  1. A
    Ferrite 
  2. B
    Piezoelectric 
  3. C
    Pyroelectric 
  4. D
    Ferromagnetic above 768°C
Question 6Single Answer
Assuming both the voltage sources are in phase, the value of R for which maximum power is transferred from circuit A to circuit B is
  1. A
    0.8 Ω
  2. B
    1.4 Ω
  3. C
    2 Ω
  4. D
    2.8 Ω
Question 7Single Answer
For the intrinsic gallium-arsenide, the conductivity at room temperature 25°C is 10-6 (ohm-m)-1, the electron and hole nobilities are 0.85 m2/V-s and 0.04 m2/V-s respectively. What is the intrinsic carrier concentration at the room temperature?
  1. A
    7.0 × 1012 m-3
  2. B
    7.0 × 10-12 m-3
  3. C
    7.0 × 10-12 m3
  4. D
    7.0 × 1012 m3
Question 8Single Answer
The resistivity of intrinsic germanium at 30°C is 0.46 –m. What is the intrinsic carrier density at 30°C if the electron mobility is 0.38 m2/V-s and the hole mobility is 0.18 m2/V-s?
  1. A
    9.2 × 105/m3
  2. B
    2.77 × 103/m3
  3. C
    2.43 × 1019/m3
  4. D
    8.9 × 1012/m3
Question 9Single Answer
Heat conduction in a semiconductor takes place
  1. A
    By the mobility of the carriers
  2. B
    Due to energy gap between conduction band and valency band
  3. C
    By the holes and thermal vibrations of atoms
  4. D
    By the electrons and thermal vibrations of atoms
Question 10Single Answer
Brewster angle is the angle when a wave is incident on the surface of a perfect dielectric at which there is no reflected wave and the incident wave is
  1. A
    Parallel polarized
  2. B
    Perpendicularly polarized
  3. C
    Normally polarized
  4. D
    None of the above
Question 11Single Answer
An electrical breakdown of a p-n junction occurs if
  1. A
    Forward voltage increases up to the rating
  2. B
    Reverse voltage increases beyond the rating
  3. C
    Forward voltage decreases below the rating
  4. D
    Reverse voltage decreases below the rating
Question 12Single Answer
The chief deterrent to the widespread application of superconducting materials is
  1. A
    Very difficult to form, machine or case
  2. B
    The difficult in attaining and maintaining extremely low temperature
  3. C
    The poor strength-to-weight ratio
  4. D
    The lower oxidation rate at elevated temperatures
Question 13Single Answer
Which one of the following properties is not observed in the carbon nanotubes ?
  1. A
    High stiffness and strengths
  2. B
    Low densities
  3. C
    Unusual electrical property
  4. D
    Non-ductile
Question 14Single Answer
The evidence for the importance of electron-phonon interaction in super-conductors comes from
  1. A
    Meissner effect
  2. B
    Josephson effect
  3. C
    Isotope effect
  4. D
    x quantization experiments
Question 15Single Answer
Which one of the following materials is used for cable insulation ?
  1. A
    Phenol formaldehyde
  2. B
    Polytetrafluoroethylene
  3. C
    Polyvinyl chloride
  4. D
    Acrylonitrile butadiene styrene
Question 16Single 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 17Single 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 18Single 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 19Single 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 20Single 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 21Single 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 22Single 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 23Single 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 24Single 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 25Single 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 26Single 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 27Single 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 28Single 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 29Single 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 30Single 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 31Single Answer
What is the primary purpose of the Laplace transform in network analysis?
  1. A
    To solve differential equations in the time domain
  2. B
    To convert time-domain signals to frequency domain
  3. C
    To analyze discrete systems
  4. D
    To synthesize network components
Question 32Single Answer
What is the Laplace transform of a unit step function u(t)?
  1. A
    1/s
  2. B
    s
  3. C
    e(-s)
  4. D
    1/(s+1)
Question 33Single Answer
Which property of the Laplace transform is used to handle initial conditions in network analysis?
  1. A
    Linearity
  2. B
    Time-shifting
  3. C
    Differentiation in time domain
  4. D
    Convolution
Question 34Single Answer
What is the Laplace transform of the derivative of a function f(t)?
  1. A
    sF(s)
  2. B
    sF(s) - f(0)
  3. C
    F(s)/s
  4. D
    F(s) + f(0)
Question 35Single Answer
What is the primary application of the Laplace transform in circuit analysis?
  1. A
    Solving algebraic equations
  2. B
    Solving differential equations for transient response
  3. C
    Analyzing steady-state response
  4. D
    Synthesizing network components
Question 36Single Answer
What is the Laplace transform of an exponential function e(-at)?
  1. A
    1/(s+1)
  2. B
    Decrease the speed
  3. C
    Have no effect on speed
  4. D
    Increase the torque
Question 37Single Answer
Which transform is used to analyze the frequency response of a network?
  1. A
    Laplace transform
  2. B
    Fourier transform
  3. C
    Z-transform
  4. D
    Hilbert transform
Question 38Single Answer
What is the primary function of a chopper in a DC drive system?
  1. A
    To regulate AC voltage
  2. B
    To convert DC to AC
  3. C
    To control DC voltage by varying duty cycle
  4. D
    To step up AC voltage
Question 39Single Answer
Which type of chopper is used for regenerative braking in DC drives?
  1. A
    Step-up chopper
  2. B
    Step-down chopper
  3. C
    Two-quadrant chopper
  4. D
    Single-quadrant chopper
Question 40Single Answer
In a DC drive, what does the armature control method primarily regulate?
  1. A
    Field current
  2. B
    Armature voltage
  3. C
    Motor torque
  4. D
    Back EMF
Question 41Single Answer
What is the role of a freewheeling diode in a DC chopper circuit?
  1. A
    To increase voltage
  2. B
    To provide a path for inductor current during off-time
  3. C
    To block reverse current
  4. D
    To regulate frequency
Question 42Single Answer
Which power electronic device is commonly used in DC drives for speed control?
  1. A
    Diode
  2. B
    Thyristor
  3. C
    IGBT
  4. D
    BJT
Question 43Single Answer
What is the main advantage of using a PWM-based chopper in DC drives?
  1. A
    High power loss
  2. B
    Reduced harmonics and improved efficiency
  3. C
    Fixed frequency operation
  4. D
    Low voltage regulation
Question 44Single Answer
In a DC motor drive, how is speed increased above the base speed?
  1. A
    By reducing field current
  2. B
    By increasing armature voltage
  3. C
    By increasing load torque
  4. D
    By reducing armature resistance
Question 45Single Answer
What is the purpose of a cycloconverter in AC drives?
  1. A
    To convert DC to AC
  2. B
    To convert AC of one frequency to another
  3. C
    To regulate DC voltage
  4. D
    To step up AC voltage
Question 46Single Answer
If (A=\begin{bmatrix}2&1\4&2\end{bmatrix}), what is the rank of matrix (A)?
  1. A
    0
  2. B
    1
  3. C
    2
  4. D
    3
Question 47Single Answer
What is the determinant of the matrix (\begin{bmatrix}3&5\2&7\end{bmatrix})?
  1. A
    19
  2. B
    21
  3. C
    17
  4. D
    11
Question 48Single Answer
A square matrix is invertible if and only if?
  1. A
    Its determinant is zero
  2. B
    Its trace is zero
  3. C
    It is symmetric
  4. D
    Its determinant is non-zero
Question 49Single Answer
The eigenvalues of the identity matrix of order 4 are?
  1. A
    0, 0, 0, 0
  2. B
    1, 1, 1, 1
  3. C
    4, 4, 4, 4
  4. D
    −1, −1, −1, −1
Question 50Single Answer
If the trace of a 3×3 matrix is 12 and two eigenvalues are 2 and 5, what is the third eigenvalue?
  1. A
    3
  2. B
    4
  3. C
    7
  4. D
    5
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