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Electrical Engineering Questions with Answer

Question No. 1. In a control system integral error compensation _______ steady state error
(a) increases
(b) minimizes
(c) does not have any effect on
(d) any of the above
Ans: b

Question No. 2.  If the field circuits of an unloaded salient pole synchronous motor gets suddenly open
circuited, then
 (A) The motor stops.
 (B) It continues to run at the same speed.
 (C) Its runs at the slower speed.
 (D) It runs at a very high speed.
Ans: B

Question No. 3. Two holes in the disc of energymeter are drilled at the opposite sides of the spindle to
(a) improve its ventilation
(b) eliminate creeping at no load
(c) increase its deflecting torque
(d) increase its braking tcrque
Ans: b


Question No. 4. In a stable control system saturation can cause which of the following ?
(a) Low-level oscillations
(b) High-level oscillations
(c) Conditional stability
(d) Overdamping
Ans: a
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Question No. 5. Instrument transformers are
(a) potential transformers
(b) current transformers
(c) both (a) and (b)
(d) power transformers
Ans: c

Question No. 6. A 50 Hz, 3-phase induction motor has a full load speed of 1440 r.p.m. The number of
poles of the motor are
 (A) 4. (B) 6.
 (C) 12. (D) 8.
Ans: A


Question No. 7. Mass, in force-voltage analogy, is analogous to
(a) charge
(b) current
(c) inductance
(d) resistance
Ans: c

Question No. 8. A phase shifting transformer is used in conjunction with
(a) D.C. potentiometer
(b) Drysdale potentiometer
(c) A.C. co-ordinate potentiometer
(d) Crompton potentiometer
Ans: b

Question No. 9. Due to which of the following reasons excessive bond width in control systems should
be avoided ?
(a) It leads to slow speed of response
(b) It leads to low relative stability
(c) Noise is proportional to band width
(d) None of the above
Ans: c
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Question No. 10. If a transformer primary is energised from a square wave voltage source, its output
voltage will be
(A) A square wave.
(B) A sine wave.
(C) A triangular wave.
(D) A pulse wave.
Ans: A

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