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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 1
36.
Which of the following are needed both for protection and metering?
Wattmeters
Instrument transformers
Energy meters
Power factor meters
Answer: Option
Explanation:

Instrument transformers are used to measure high currents and voltages. They also feed the relays for protection.

37.
A digital frequency counter can be converted to DVM by addition of a suitable
voltage controlled oscillator
D/A converter
power amplifier
operational amplifier
Answer: Option
Explanation:

D/A converter changes digital output to analog output.

38.
A dynamometer wattmeter is connected in ac circuit. The reading will be
V-A product
average power
peak power
instantaneous power
Answer: Option
Explanation:

Wattmeter measures average power over a cycle.

39.
The speed transducer using a drag cup rotor has the main advantage of
very high accuracy
low energy requirement
cheap construction
all of the above
Answer: Option
Explanation:

A drag cup rotor has low inertia. Therefore it requires little amount of energy.

40.
A voltmeter using thermocouples measures
rms value
peak value
average value
peak to peak value
Answer: Option
Explanation:

Since the thermocouple is based on heating effect, rms value is measured.

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