Silicon Controlled Rectifiers MCQ Questions & Answers

Silicon Controlled Rectifiers MCQ Questions & Answers | Electrical Engineering

Learn Silicon Controlled Rectifiers MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Silicon Controlled Rectifiers MCQ question is the important chapter for a Electrical Engineering and GATE students. Page-2 section-1

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

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

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

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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

Discuss

Answer & Solution

Answer: Option C

Solution:

If the firing angle in an SCR (Silicon Controlled Rectifier) circuit is increased, the output is decreased.

The firing angle refers to the delay angle between the triggering signal and the conduction of the SCR. By increasing the firing angle, the SCR is triggered later in each cycle of the AC input voltage. This results in a shorter conduction period and therefore a decreased output from the SCR.

Therefore, the correct answer is Option C: Is decreased.

When an SCR is turned on, the voltage across it is about ___________

A) Zero B) 10 V C) 1.5 V D) 1 V

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

The control element of an SCR is ___________

A) Cathode B) Anode C) Anode supply D) Gate

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

An SCR has three terminals viz ___________

A) Cathode, anode, gate B) Anode, cathode, grid C) Anode, cathode, drain D) None of the above

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

We can control a.c. power in a load by connecting ___________

A) Two SCRs in series B) Two SCRs in parallel C) Two SCRs in parallel opposition D) None of the above

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

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

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

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

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board