POWER ELECTRONICS QUIZ

An instrument to be used for measurement and control should preferably have

A highly damped response

Dead zone and dead time

Linear output and fast response

Non-linear output

TRUE ANSWER : ?
YOUR ANSWER : ?

The resistance can be measured most accurately by

Voltmeter-ammeter method

Multimeter

Megger

Bridge method

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one of the following meters has maximum loading effect on the circuit under measurement ?

1000 Ω/volt

10 MΩ/volt

1 MΩ/volt

100 Ω/volt

TRUE ANSWER : ?
YOUR ANSWER : ?

Electrostatic instruments are normally used for

High current measurements

Low voltage measurements

High voltage measurements

Low current measurements

TRUE ANSWER : ?
YOUR ANSWER : ?

Why is a MISC meter not recommended for DC measurement?

The error is high due to hysteresis effect

The error is high due to eddy current effect

The meter is calibrated for AC and it’s error for DC would be high

The meter does not respond to DC signals

TRUE ANSWER : ?
YOUR ANSWER : ?

An induction wattmeter can be used for

Both DC and AC

Ac only

Any of the listed here

Dc only

TRUE ANSWER : ?
YOUR ANSWER : ?

A megger is usually

Moving coil type instrument

Electro-static type instrument

Moving iron type instrument

Hot-wire type instrument

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following instruments can be used to measure AC current only?

Permanent Magnet Type ammeter

Moving iron ammeter

Moving iron voltmeter

Induction type ammeter

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following devices may be used for extending the range of instruments?

Shunt

All of the listed here

Potential transformers

Current transformers

TRUE ANSWER : ?
YOUR ANSWER : ?

For a circuit given that I = 2 ± 5 % A, R = 100 ± 0.2 % Ω the limiting error in the power dissipation I2 R in the resistor R is

1.2%

5.2%

25.2%

10.2%

TRUE ANSWER : ?
YOUR ANSWER : ?

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