Silicon Controlled Rectifiers MCQ

Silicon Controlled Rectifiers MCQ

  • Admin
  • 17th Apr, 2021

Silicon Controlled Rectifiers MCQ Test

Following are mostly asked Silicon controlled rectifiers MCQ test that are designed for professionals like you to crack you interviews. You can take this Silicon controlled rectifiers online test before appearing to you real interview. This Silicon controlled rectifiers quiz there are around 30+ multiple choice questions on Silicon controlled rectifiers with four options.

1) What does scr stand for in electronics?

  • A. Semiconductor Controlled Rectifiers
  • B. Silicon Controlled Rectifiers
  • C. Solar Controlled Rectifiers
  • D. Both Semiconductor & Silicon Controlled Rectifiers

2) An SCR has …………….. pn junctions

  • A. One
  • B. Two
  • C. Three
  • D. Four

3) An SCR is a solid state equivalent of …………….

  • A. Triode
  • B. Tetrode
  • C. Gas-filled triode
  • D. None of the above

4) An SCR has ………….. semiconductor layers.

  • A. One
  • B. Two
  • C. Three
  • D. Four

5) The normal way to turn on a SCR is by ……………..

  • A. Breakover voltage
  • B. Appropriate gate current
  • C. Appropriate anode current
  • D. All of the Above

6) Which of the following is the control element of an SCR?

  • A. Gate
  • B. Anode
  • C. Cathode
  • D. None of the above

7) We can control a.c. power in a load by connecting two SCRs in parallel opposition.

  • A. True
  • B. False

8) When scr is off the current in the circuit is

  • A. Small leakage current
  • B. Large leakage current
  • C. zero leakage current
  • D. None of the above

9) In an scr circuit the angle of conduction can be changed by

  • A. Changing gate voltage
  • B. Changing anode voltage
  • C. Reverse biasing the gate
  • D. None of the above

10) An scr is turned off when .............

  • A. Gate is reverse biased
  • B. Gate voltage is reduced to zero
  • C. Anode current is reduced to zero
  • D. All of the Above

11) An SCR is made of ................ metal.

  • A. Alluminium
  • B. Silicon
  • C. Iron
  • D. None of the above

12) An SCR combines the features of a …………..

  • A. Rectifier
  • B. Transistor
  • C. Capacitor
  • D. Both Rectifier & Transistor

13) An SCR behaves as a ................

  • A. Mechanical Switch
  • B. Bidirectional Switch
  • C. Unidirectional Switch
  • D. None of the above

14) The SCR is made up of silicon, because ............

  • A. Silicon has large leakage current
  • B. Silicon has small leakage voltage
  • C. Silicon has small leakage current
  • D. None of the above

15) Which terminal does not belong to the SCR?

  • A. Gate
  • B. Base
  • C. Anode
  • D. Cathode

16) Which of the following is incorrect about Scr?

  • A. SCR is a controlled device
  • B. SCR is a bidirectional device
  • C. SCR are used for high-power applications
  • D. All of the Above

17) The gate terminal is located in ............. the SCR structure.

  • A. near the cathode terminal
  • B. near the anode terminal
  • C. between the anode & cathode terminal
  • D. None of the above

18) What is a triac?

  • A. 2 terminal switch
  • B. 3 terminal bilateral switch
  • C. 3 terminal bidirectional switch
  • D. None of the above

19) An SCR has three terminals viz ……………

  • A. Cathode
  • B. Anode
  • C. Gate
  • D. All of the Above

20) An SCR is also called …………

  • A. Diac
  • B. Triac
  • C. Thyristor
  • D. None of the above

21) SCRs are mainly used in devices where the control of high power, possibly coupled with high voltage, is demanded

  • A. True
  • B. False

22) An SCR can be brought from blocking mode to conduction mode in ..........

  • A. 2 Ways
  • B. 3 Ways
  • C. 4 Ways
  • D. 5 Ways

23) There are three modes of operation for an SCR depending upon the biasing given to it, Which are -

  • A. Forward blocking mode
  • B. Reverse blocking mode
  • C. Forward conduction mode
  • D. All of the Above

24) TRIACs are suitable for ........

  • A. Light-dimming circuits
  • B. Phase-control circuits
  • C. AC power-switching circuits
  • D. All of the Above

25) The Silicon controlled rectifier was founded by General Electric in ...........

  • A. 1956
  • B. 1955
  • C. 1957
  • D. None of the above

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