Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

During testing of an energy meter, the energy recorded by meter was 0.05 kWh and correct energy was found to be 0.09 kWh. The error and correction respectively are
A:
-0.01 kWh and 0.01 kWh
B:
0.01 kWh and -0.01 kWh
C:
-0.01 kWh and ± 0.01 kWh
D:
± 0.01 kWh and 0.01 kWh
Answer: A
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The torque in induction wattmeters due to
A:
capacitive current
B:
electrostatic effect
C:
hall effect
D:
eddy currents
Answer: D

Eddy currents are induced in the disc.

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Assertion (A): Many instruments use eddy current damping.

Reason (R): Eddy currents set up a magnetic flux which opposes the original movement which generates them.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true R is false
D:
A is false R is true
Answer: A
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Panel instruments are generally mounted vertically.
A:
True
B:
False
C:
D:
Answer: A
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For measuring temperatures below 800°C with high accuracy, the best instrument is
A:
optical pyrometer
B:
thermistor based thermometer
C:
GaAs junction diode thermometer
D:
platinum resistance thermometer
Answer: D
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