Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

A voltmeter using thermocouples measures
A:
rms value
B:
peak value
C:
average value
D:
peak to peak value
Answer: A

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

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The speed transducer using a drag cup rotor has the main advantage of
A:
very high accuracy
B:
low energy requirement
C:
cheap construction
D:
all of the above
Answer: B

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

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A dynamometer wattmeter is connected in ac circuit. The reading will be
A:
V-A product
B:
average power
C:
peak power
D:
instantaneous power
Answer: B

Wattmeter measures average power over a cycle.

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

D/A converter changes digital output to analog output.

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Which of the following are needed both for protection and metering?
A:
Wattmeters
B:
Instrument transformers
C:
Energy meters
D:
Power factor meters
Answer: B

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

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