Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

The signal to noise ratio in telemetry should be better than
A:
5 db
B:
10 db
C:
25 db
D:
60 db
Answer: D
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Figure shows the equivalent circuit of resistor. The resistor is non-inductive when
A:
R = L/C
B:
LR = L/C
C:
L = CR2
D:
C = LR2
Answer: C
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In low power factor wattmeter, the pressure coil is connected
A:
to the supply side of current coil
B:
to the load side of current coil
C:
in either (a) or (b)
D:
across the mains
Answer: B
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Consider the following statements about mutual inductances:
  1. The value should remain constant under all conditions.
  2. The mutual inductance should not vary with temperature.
  3. The inductance should be independent of excitation.
  4. They have two coils wound on a bobbin of hard magnetic material, coils being separated by a range.
Out of the above, correct statement are
A:
2, 3, 4
B:
1, 2, 3
C:
1, 3, 4
D:
1, 2, 4
Answer: B
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In figure, the reading of wattmeter will be proportional
A:
V I cos θ
B:
3 VI cos θ
C:
3 VI sin θ
D:
V I sin θ
Answer: C
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