AC Voltage Controllers Objective Questions – 1

AC Voltage Controllers Objective Questions

Power Electronics Objective Questions & Answers

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In AC voltage controllers the

variable dc with fixed frequency is obtained

variable ac with fixed frequency is obtained

variable dc with variable frequency is obtained

variable ac with variable frequency is obtained

Correct!

Wrong!

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In the below given voltage controller circuit

the positive half cycle at the load is same as the supply Vs

the positive and negative half cycles at the load are identical to the supply

none of the mentioned

the negative half cycle at the load is same as the supply Vs

Correct!

Wrong!

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A single-phase half wave voltage controller consists of

two SCRs in anti parallel

one SCR is anti parallel with one diode

two SCRs in parallel

one SCR is parallel with one diode

Correct!

Wrong!

-

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AC voltage controllers convert

variable ac to fixed ac

fixed ac to fixed dc

variable ac to variable dc

fixed ac to variable ac

Correct!

Wrong!

-

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The AC voltage controllers are used in __________ applications.

power transmission

electric heating

conveyor belt motion

power generation

Correct!

Wrong!

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The below shown controller circuit is a

half wave controller

will depend upon the firing angle

full wave controller

none of the mentioned

Correct!

Wrong!

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Earlier then the semiconductor technology, ___________ devices were used for voltage control applications.

vacuum tubes

tap changing transformer

cycloconverters

induction machine

Correct!

Wrong!

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In the principle of phase control

control is achieved by adjusting the number of on off cycles

control is achieved by adjusting the firing angle of the devices

the load is on for some cycles and off for some cycles

control cannot be achieved

Correct!

Wrong!

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The below given controller circuit is a

none of the mentioned

will depend upon the firing angle

half wave controller

full wave controller

Correct!

Wrong!

-

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In the below given voltage controller circuit

none of the mentioned

only the negative cycle can be controlled

both the cycles can be controlled

only the positive cycle can be controlled

Correct!

Wrong!

-

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