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Month: December 2018

An SCR is turned off when ________________?

August 11, 2021December 21, 2018 by admin
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

Categories SCR (Silicon Controlled Rectifiers)

If gate current is increased, then anode-cathode voltage at which SCR closes_________________?

August 11, 2021December 21, 2018 by admin
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

Categories SCR (Silicon Controlled Rectifiers)

In an SCR circuit, the angle of conduction can be changed by__________________?

August 11, 2021December 21, 2018 by admin
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

Categories SCR (Silicon Controlled Rectifiers)

When SCR is OFF, the current in the circuit is ________________?

August 11, 2021December 21, 2018 by admin
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

Categories SCR (Silicon Controlled Rectifiers)

We can control a.c. power in a load by connecting ______________?

August 11, 2021December 21, 2018 by admin
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

Categories SCR (Silicon Controlled Rectifiers)

If firing angle in an SCR circuit is increased, the output _____________?

August 11, 2021December 21, 2018 by admin
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

Categories SCR (Silicon Controlled Rectifiers)

An SCR can exercise control over____________of a.c. supply?

August 11, 2021December 21, 2018 by admin
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

Categories SCR (Silicon Controlled Rectifiers)

When SCR starts conducting, then _____________ loses all control?

August 11, 2021December 21, 2018 by admin
When SCR starts conducting, then _____________ loses all control?

A. Gate
B. Cathode
C. Anode
D. None of the above

Categories SCR (Silicon Controlled Rectifiers)

The Q of a tuned amplifier is generally _________________?

August 11, 2021December 21, 2018 by admin
The Q of a tuned amplifier is generally _________________?

A. Less than 5
B. Less than 10
C. More than 10
D. None of the above

Categories Transistor Tuned Amplifiers

For frequencies below resonant frequency, a series LC circuit behaves as a _____________ load?

August 11, 2021December 21, 2018 by admin
For frequencies below resonant frequency, a series LC circuit behaves as a _____________ load?

A. Resistive
B. Capacitive
C. Inductive
D. None of the above

Categories Transistor Tuned Amplifiers
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