Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

Consider the following statements about a moving iron instrument
  1. It is an unpolarised instrument.
  2. It has permanent magnet.
  3. It has a fixed coil.
  4. It has two iron vanes.
Of these statements
A:
1, 2, 3 are correct
B:
1, 2, 4 are correct
C:
1, 3 and 4 are correct
D:
2, 3, 4 are correct
Answer: C

It does not have a permanent magnet.

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For use at 50 Hz the range of scale of vibrating reed frequency meter is
A:
25 - 75 Hz
B:
40 - 60 Hz
C:
47 - 53 Hz
D:
42 - 58 Hz
Answer: C

Generally the frequency does not fall below 47 Hz and does not exceed 53 Hz.

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Which of the following closely represents the resistance-temperature characteristics of thermistor?
A:
RT = a R0 eb/t
B:
RT = a R0 E-b/t
C:
RT = - a R0 e-b/t
D:
RT = - R0 eb/t
Answer: A
No answer description is available. Let's discuss.
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The device having highest photo sensitivity is
A:
photoconductive cell
B:
photovoltaic cell
C:
photodiode
D:
phototransistor
Answer: A
No answer description is available. Let's discuss.
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Assertion (A): Hay's bridge in particularly suitable for measuring inductance having a comparatively low resistance.

Reason (R): In Hay's bridge the value of frequency supply must be known.

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: B
No answer description is available. Let's discuss.
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