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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 2
36.
A meter has a square law scale. For 2 A current the deflection in 90°. For a deflection of 45°, the current is
1 A
1.5 A
1.414 A
1.61 A
Answer: Option
Explanation:

37.
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?
1, 2, 3
1 and 2
2 and 3
1 and 3
Answer: Option
Explanation:

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

38.
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
2 kHz
4 kHz
8 kHz
16 kHz
Answer: Option
Explanation:

Bandwidth required is twice the required frequency range.

39.
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
10 A
5 A
3.185 A
1.414 A
Answer: Option
Explanation:

Hot wire ammeter indicates rms value

.

40.
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
short circuited
all right
faulty
open circuited
Answer: Option
Explanation:

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

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