Silicon Controlled Rectifiers(Electrical Engineering ) Questions and answers for exam Preparation

Question 1. An SCR is made of ___________

Germanium
Silicon
Carbon
None of the above

Explanation:-

Answer: Option B. -> Silicon

Question 2. An SCR is a ___________ triggered device

Voltage
Current
Voltage as well as current
None of the above

Explanation:-

Answer: Option B. -> Current

Question 3. In the normal operation of an SCR, anode is ___________ w.r.t. cathode

At zero potential
Negative
Positive
None of the above

Explanation:-

Answer: Option C. -> Positive

Question 4. When SCR starts conducting, then ___________ loses all control

Gate
Cathode
Anode
None of the above

Explanation:-

Answer: Option A. -> Gate

Question 5. An SCR can exercise control over ___________ of a.c. supply

Positive half-cycles only
Negative half-cycles only
Both positive and negative half-cycles
Positive or negative half-cycles

Explanation:-

Answer: Option D. -> Positive or negative half-cycles

Question 6. An SCR is a solid state equivalent of ___________

Triode
Pentode
Gas-filled triode
Tetrode

Explanation:-

Answer: Option C. -> Gas-filled triode

Question 7. In normal operation of an SCR, gate is ___________w.r.t. cathode

Positive
Negative
At zero potential
None of the above

Explanation:-

Answer: Option A. -> Positive

Question 8. An SCR behaves as a ___________ switch

Unidirectional
Bidirectional
Mechanical
None of the above

Explanation:-

Answer: Option A. -> Unidirectional

Question 9. An SCR has ___________ pn junctions

Two
Three
Four
None of the above

Explanation:-

Answer: Option B. -> Three

Question 10. In an SCR circuit, the angle of conduction can be changed by ___________

Changing anode voltage
Changing gate voltage
Reverse biasing the gate
None of the above

Explanation:-

Answer: Option B. -> Changing gate voltage