Silicon Controlled Rectifiers Quiz | Silicon Controlled Rectifiers Multiple Choice Questions and Answers

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Questions
1 If firing angle in an SCR circuit is increased, the output …………
A Remains the same
B Is increased
C Is decreased
D None of the above

Answer: Is decreased
2 In an SCR circuit, the angle of conduction can be changed by ……….
A Changing anode voltage
B Changing gate voltage
C Reverse biasing the gate
D None of the above

Answer: Changing gate voltage
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3 An SCR is turned off when …………..
A Anode current is reduced to zero
B Gate voltage is reduced to zero
C Gate is reverse biased
D None of the above

Answer: Anode current is reduced to zero
4 An SCR is made of silicon and not germanium because silicon ………
A Is inexpensive
B Is mechanically strong
C Has small leakage current
D Is tetravalent

Answer: Has small leakage current
5 When an SCR is turned on, the voltage across it is about ……….
A Zero
B 10 V
C 1 V
D 1 V

Answer: 1 V
6 In an SCR circuit the supply voltage is generally ……….. that of breakover voltage
A Equal to
B Less than
C Greater than
D None of the above

Answer: Less than
7 An SCR is a ……………….. triggered device
A Voltage
B Current
C Voltage as well as current
D None of the above

Answer: Current
8 An SCR is turned off by …………….
A Reducing anode voltage to zero
B Reducing gate voltage to zero
C Reverse biasing the gate
D None of the above

Answer: Reducing anode voltage to zero
9 The normal way to turn on a SCR is by ……………..
A Breakover voltage
B Appropriate anode current
C Appropriate gate current
D None of the above

Answer: Appropriate gate current
10 The control element of an SCR is ………….
A Cathode
B Anode
C Anode supply
D Gate

Answer: Gate
11 An SCR combines the features of …………..
A A rectifier and resistance
B A rectifier and transistor
C A rectifier and capacitor
D None of the above

Answer: A rectifier and transistor
12 In normal operation of an SCR, gate is ………..w.r.t. cathode
A Positive
B Negative
C At zero potential
D None of the above

Answer: Positive
13 In the normal operation of an SCR, anode is …………… w.r.t. cathode
A At zero potential
B Negative
C Positive
D None of the above

Answer: Positive
14 An SCR is made of ………….
A Germanium
B Silicon
C Carbon
D None of the above

Answer: Silicon
15 An SCR is sometimes called …………
A Triac
B Diac
C Unijunction transistor
D Thyristor

Answer: Thyristor
16 An SCR behaves as a ……………. switch
A Unidirectional
B Bidirectional
C Mechanical
D None of the above

Answer: Unidirectional
17 An SCR has three terminals viz ……………
A Cathode, anode, gate
B Anode, cathode, grid
C Anode, cathode, drain
D None of the above

Answer: Cathode, anode, gate
18 An SCR has ………….. semiconductor layers
A Two
B Three
C Four
D None of the above

Answer: Four
19 An SCR is a solid state equivalent of …………….
A Triode
B Pentode
C Gas-filled triode
D Tetrode

Answer: Gas-filled triode
20 An SCR has …………….. pn junctions
A Two
B Three
C Four
D None of the above

Answer: Three

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