MCQs Electrical Engineering
1. An open-loop system is better than a closed-loop system in terms of
(1)Accuracy
(2)Stability
(3) Noise reduction
(4) Sensitivity
Ans (2)
2. The control system in which the output quantity has no effect upon the input quantity are called ______control system.
(1)Open loop
(2) closed loop
(3) Variable
(4) Non-variable
Ans (1)
3. _____is a static exciter.
(1)DC separately excited generator
(2)Amplidyne
(3) Retool
(4) Rectifier
Ans (4)
4. Gunn diode is a -
(1) Negative resistance device
(2)Positive resistance device
(3) High noise device
(4)Low frequency device
Ans (1)
5. A UJT exhibits negative resistance region :
(1) before the peak point
(2) after valley point
(3)Both 1 & 2
(4) between peak and valley points
Ans (4)
6. Which semiconductor device behaves like to SCR's ?
(1) JFET.
(2) UJT
(3) Triac
(4) MOSFET
Ans (3)
7. When cathode is positive with respect to anode in an SCR, the number of blocked p-n junctions is
(1) 1
(2) 2
(3) 3
(4) 4.
Ans (2)
8. An IGBT has three terminals called
(1) Collector, Emitter and Base
(2) Drain, Source and Gate
(3) Drain, Source and Gate
(4) Collector, Emitter and Gate
Ans (4)
9. When a UJT is used for triggering of a SCR, the wave shape of the voltage obtained from UJT circuit is a
(1) Sine wave
(2) Saw-tooth wave
(3) Trapezoidal wave
(4) Square wave
Ans (2)
10. If the gate current of a SCR is increased, the forward breakdown voltage VDR will
(1) Increase
(2) Decrease
(3)Not be affected
(4) Infinite
Ans (2)