In an SCR circuit the supply voltage is generally ___________ that of breakover voltage

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

A

Positive half-cycles only

B

Negative half-cycles only

C

Both positive and negative half-cycles

D

Positive or negative half-cycles

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

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

When SCR is OFF, the current in the circuit is ___________

A

Exactly zero

B

Small leakage current

C

Large leakage current

D

None of the above

A power supply which has voltage regulation of ___________ is unregulated power supply

A

0%

B

5%

C

10%

D

8%

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

A

Zero

B

10 V

C

1.5 V

D

1 V

If gate current is increased, then anode-cathode voltage at which SCR closes ___________

A

Is decreased

B

Is increased

C

Remains the same

D

None of the above

An SCR is made of ___________

A

Germanium

B

Silicon

C

Carbon

D

None of the above

When SCR starts conducting, then ___________ loses all control

A

Gate

B

Cathode

C

Anode

D

None of the above

An SCR is a ___________ triggered device

A

Voltage

B

Current

C

Voltage as well as current

D

None of the above

In an SCR circuit the supply voltage is generally ___________ that of breakover voltage

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