Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

When a capacitor is connected to the terminals of an ohmmeter, the pointer indicated a low resistance initially and finally come to infinity position. This shows that capacitor is
A:
short circuited
B:
all right
C:
faulty
D:
open circuited
Answer: B

Capacitor behaves as short circut initially and open circuit finally when fed by dc supply.

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A sinusoidal ac voltage of amplitude 100 V is applied to a rectifying device which offers 10 Ω resistance in forward direction and infinite resistance in reverse direction. The reading on hot wire ammeter will be
A:
10 A
B:
5 A
C:
3.185 A
D:
1.414 A
Answer: B

Hot wire ammeter indicates rms value

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PCM employing 4 bit code is used to send data having frequency range from 0 to 2 kHz. The minimum required bandwidth of carrier channel is
A:
2 kHz
B:
4 kHz
C:
8 kHz
D:
16 kHz
Answer: B

Bandwidth required is twice the required frequency range.

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Consider the following Statements regarding resistance strain gauge
  1. The gauge factor is in the range of 2 to 5.
  2. The resistance changes due to change in specific resistance with strain.
  3. The resistance increases with increase in temperature.
Of the above statements, which are correct?
A:
1, 2, 3
B:
1 and 2
C:
2 and 3
D:
1 and 3
Answer: D

The change in resistance is due to change in length and area of cross-section.

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A meter has a square law scale. For 2 A current the deflection in 90°. For a deflection of 45°, the current is
A:
1 A
B:
1.5 A
C:
1.414 A
D:
1.61 A
Answer: C

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