Power Grid Corporation of India Executive Trainee post EE Sample question paper

Kindly provide me the Power Grid Corporation of India Executive Trainee post EE Sample question paper………………

[Kiran Chandar]

Power Grid Corporation of India recruits Executive Trainee candidate through the GATE scores, so here I am sharing the GATE EE Sample question paper:

Q.1:- Two materials have resistance temperature coefficients of 0.004 and 0.0002 respectively at a given
temperature. In what ratio should the wires made of these materials be connected in series so as to have an
overall temperature coefficient of 0.002?
(a) 1:2 (b) 2:3 (c) 9:10 (d) 15:16
Q.2:- Consider the two fields,
E = 120 𝜋 cos (10⁶𝜋 t- x) V / m
And
H = A cos (10⁶𝜋 t- x) / m.
The values of A and β which will satisfy the Maxwell’s equation in a linear isotropic, homogeneous,
loss-less-medium with = 8 and
= 2 will be
A (in A / m) β (in rad / m)
(a) 1 0.0105
(b) 1 0.042
(c) 2 0.0105
(d) 2 0.042
Q.3:- A chopper operating at a fixed frequency is feeding an R-L load. As they duty ratio of the choppe is
increased from 25% to 75%, the ripple in the load current.
(a) Remains constant.
(b) Decreases, reaches a minimum at 50% duty ratio and then increases.
(c) Increases, reaches a maximum at 50% duty ratio and then decreases.
(d) Keeps on increasing as the duty ratio is increased.
Q.4:- A sinusoidal waveform, when observed on an oscilloscope, has a peak to peak amplitude of 6cm. If
the vertical sensitivity setting is 5 V / cm, the rms value of the voltage will be
(a) 10.6 V (b) 11.1 V (c) 12.6 V (d) 15 V
Q.5:- Which of the following is an example of an open-loop system?
(a) Household refrigerator.
(b) Respiratory system of an animal.
(c) Stabilization of air pressure entering into a mask.
(d) Execution of a program by a computer.
Q.6:- A binary tree T has n leaf nodes. The number of nodes of degree 2 in T is
(a) (a) n (b) n – 1
(b) (c) n (d)
Q.7:- An n-channel silicon (= 1.1 eV) MOSFET was fabricated using n⁺ poly silicon gate and the threshold
voltage was found to be 1 V. Now, if the gate is changed to p⁺ poly-silicon, other things remaining the same,
the new threshold voltage should be
(a) –0.1 V (b) 0 V (c) 1.0 V (d) 2.1 V
Q.8:- Scintillation is
(a) Variation of physical dimensions under the influence of magnetic field.
(b) Deionization of gases under low pressures.
(c) Production of flashes of light by some substances when struck by alpha, beta of gamma rays.
(d) Change in dielectric constant of substances with change in humidity.
Q.9:- Which of the following statements is true?
(a) ROM is Read /Write memory.
(b) PC points to the last instruction that was executed.
(c) Stack works on the principle of LIFO.
(d) All instructions affect the flags.
Q.10:- In which range the cost of a synchronous motor is likely to be comparable to the cost of induction
motor?
(a) Low H.P., high speed.
(b) High H.P., low speed.
(c) High H.P., high speed.
(d) Low H.P., low speed.
Q.11:- which one of the theories given below is related to the theory of the thermocouple?
(a) Piezoelectric effect (b) Skin effect (c) See back effect (d) Faraday’s Law
Q.12:- For the purpose of analysis exact equivalent circuit of a transformer is usually replaced by an
approximate equivalent circuit. In doing so errors introduced due to winding copper loss and core loss are
of differential nature. Due to this the analysis by approximate equivalent circuit gives fairly satisfactory
results. Under the circumstance, which one of the following is correct in respect of losses referred to
approx. Equivalent circuit?
(a) This accounts for somewhat greater primary winding copper loss and more cores less core loss.
(b) This accounts for somewhat lesser primary winding copper loss and more core loss.
(c) This accounts for somewhat greater secondary winding copper loss and less core loss
(d) This accounts for somewhat lesser secondary winding copper loss and more core loss.
Q.13:- Consider the following statements: In a 3-phase induction motor connected to a 3-phase supply; if
one of the lines suddenly gets disconnected, then the
1. Motor will come to a standstill.
2. Motor will continue to run at the same speed with line current unchanged.
3. Motor will continue to run at a slightly reduced speed with increased line current.
4. Rotor currents will have both sf and a (2-s) f component frequency where s is the slip and f is the
supply frequency.
Of these statements:
(a) 1 and 4 are correct
(b) 1 and 2 are correct
(c) 3 and 4 are correct
(d) 2 and 3 are correct
Q.14:- While a 2-phase ac servomotor is in operation, if the voltage across the control field winding
becomes zero, then the motor has a tendency to run as a single-phase induction motor. To prevent this
(a) rotor having high mass moment of inertia is used for such a motor
(b) drag cup type of light rotor with high rotor resistance is preferred
(c) a low rotor resistance is used
(d) The number of turns in the control field winding used is less than the main reference wingding.
Q.15:- The inertia constant of a 100 MVA, 11 KV water wheel generators is 4. The energy stored in the rotor
at the synchronous speed is
(a) (a) 400 MJ (b) 400 KJ
(b) (c) 25 MJ (d) 25 KJ.
Q.16:- A separately excited dc generator is feeding a shunt motor. If the load torque on the motor is halved
approximately.
(a) Armature currents of both motor and generator are halved.
(b) Armature current of motor is halved and that of generator is unaltered.
(c) Armature current of generator is halved and that of motor is unaltered.
(d) Armature currents of both motor and generator are unaltered.
Q.17:-Which variety of coal has lowest calorific value?
(a) Steam coal
(b) Bituminous coal
(c) Lignite
(d) Anthracite
Q.18:- The Current through an electrical conductor is 1 ampere when the temperature of the conductor is
0°C and 0.7 ampere when the temperature of the conductor is 1200°C must be
(a) 0.08 A (b) 0.16 A (C) 0.32 A (d) 0.64 A
Q.19:- The velocity of a travelling electrmagnetic wave I freee space is given by
(a) μ₀ ε₀ (b) (c) (d)
Q.20:- When a thyristor is negatively blased
(a) all the three junctions are negatively blased .
(b) outer junctions are positively blased and the inner junction is negatively biased.
(c) outer junction are negatively baised and the inner junction is positively biased a.
(d) the junction near the anode is negatively biased and the one near the cathode is positevely
biased.
Q.21:- In the two-wattneter nethod of neasurung power in a balanced threee-phase circuit, one wattmeter
shows zero and thr other positve maximum. The lad powe factor is
(a) zero (b) 0.5 (c) 0.866 (d) 1.0
Q.22:- If the unit step response of a system is a unit impusle function, then the transfer function of such a
system will be
(a) 1 (b) 1/s (c) s (d) 1 / s²
Q.23:- The probability that a number selected at random between 100 and 999 (both inclusive will not
contain the digit 7 is
(a) 16/25 (b) (9/10)³ (c) 27/75 (d) 18/25
Q.24:- In the ciruit shown in the figure, N is a fintie gain amplifier with a gain of k, a very input impendance,
and a very low output impedance. The input impendance of the feedback amplifier with the feedback Z
connected, as shown will be
(a) Z (1-1 / k)
(b) Z (1-d)
(c) Z (k-1)
(d) Z (1-k)
Q.25:- A satellite carrying antenna system, transmitter, receiver and power supply is known as
(a) geostationary satellite
(b) orbital satellite
(c) active satellite
(d) passive satellite
Q.26:- In a virtual memory system, the address space specified by the address lines of the CCPU must than
the secondary storage size.
(a) smaller, smaller
(b) smaller, larger
(c) larger, smaller
(d) larger, larger
Q.27:- Wires are made by
(a) spinning
(b) rolling
(c) drawing
(d) turning
Q.28:- Based on the cohesive energy of an ionic solid, which of the following is not a property of the ionic
solid?
(a) It forms relatively stable and hard crystals
(b) It is a poor electric conductor
(c) It has a higher vaporization temperature
(d) None of the above.
Q.29:- If the wave-form of the voltage impressed on the primary of a Y- bank contains a 5th harmonic, the
wave-forms of the resultant voltages of primary and the secondary would be
Primary Secondary
(a) Peaked peaked
(b) Peaked flat-topped
(c) Flat-topped peaked
(d) Flat-topped flat-topped
Q.30:- In a self-excited induction generator, to keep the frequency of generated voltage constant with the
increase in load the speed of the induction machine should be
(a) Increased.
(b) Decreased.
(c) Maintained less than the rated synchronous speed.
(d) Maintained more than the rated synchronous speed.
Q.31:- The speed of a universal motor can be controlled by
(a) introducing a variable resistance in series with the motor
(b) tapping the field at various points
(c) centrifugal mechanism
(d) all of the above steps
Q.32:- A large a.c. generator, supplying to n infinite bus, has a sudden short-circuit occurring at it’s the
voltage behind the transient reactance to remain constant immediately after the fault, the acceleration of
the generator rotor is
(a) inversely proportional to the moment of inertia of the machine
(b) inversely proportional to the square of the voltage
(c) directly proportional to the square of the short-circuit current
(d) Directly proportional to the short-circuit power.
Q.33:- An electric train employing a dc series motor is running at a fixed speed, when a sudden slight drop
in the mains voltage occurs. This would result in
(a) drop in speed and rise in current
(b) rise in speed and drop in current
(


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