Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

Assertion (A): Megger is used to check insulation resistance of cables.

Reason (R): Insulation resistance of cables is very high.

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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In a Weston synchronoscope the deflecting torque is zero when
A:
currents in fixed and moving coils are in phase
B:
currents in fixed and moving coils are out of phase by 90°
C:
currents in fixed and moving coils are out of phase by 60°
D:
none of the above
Answer: B
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The advantage of LVDT over inductive bridge type transducer is that
A:
it gives high output for small changes in core position
B:
it can be used over a temperature range of - 265°C to 600°C
C:
it can measure displacement of moving object
D:
the error due to stray magnetic field is less
Answer: A
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The advantage of semiconductor strain gauge over resistance strain gauge is
A:
it is more sensitve
B:
it is more linear
C:
it is less temperature dependent
D:
it is cheaper
Answer: A
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The coding system generally used in digital telemetry is
A:
PPM (Pulse position modulation)
B:
PAM (Pulse amplitude modulation)
C:
PCM (Pulse code modulation)
D:
PDM (Pulse duration modulation)
Answer: C
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