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Free download in PDF Silicon Controlled Rectifiers Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(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
(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
(7)
An SCR is a ……………….. triggered device
[A]
Voltage
[B]
Current
[C]
Voltage as well as current
[D]
None of the above
(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
(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
(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
(14)
An SCR is made of ………….
[A]
Germanium
[B]
Silicon
[C]
Carbon
[D]
None of the above
(15)
An SCR is sometimes called …………
[A]
Triac
[B]
Diac
[C]
Unijunction transistor
[D]
Thyristor
(16)
An SCR behaves as a ……………. switch
[A]
Unidirectional
[B]
Bidirectional
[C]
Mechanical
[D]
None of the above
(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
(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
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