# In adigital voltmeter, the oscillator frequency is 400 kHz. The ramp voltage. falls from 8 V to 0 V in 20 ms. What is the number of pulses counted by the counter

1.  8000

2.  4000

3.  3200

4.  1600

4

8000

Explanation :
No Explanation available for this question

# A (0 - 25) Amp ammeter has a guaranteed accuracy of 1 per cent of full scale reading. The current measured by this ammeter is 10 Amp. The limiting error in percentage for this instrument is

1.  2.5%

2.  0.5%

3.  0.25%

4.  0.025%

4

2.5\%

Explanation :
No Explanation available for this question

# A moving coil ammeter having a resistance of 1 ohm gives full scale deflection when a current of 10 mA is passed through it. The instrument can be used for the measurement of voltage up to 10 V by

1.  connecting a resistance of 999 ohm in series with the instrument

2.  connecting a resistance of 999 ohm parallel to the ammeter

3.  connecting a resistance of 999 ohm parallel to the load

4.  connecting a resistance of 1000 ohm in series with the load

4

connecting a resistance of 999 ohm in series with the instrument

Explanation :
No Explanation available for this question

# A resistance strain gauge with gauge factor (Sf) of 2 is bonded to a steel member, which is subjected to a strain of 1 x 10 -6. The original resistance value of this strain gauge is 120 Ω .The change in resistance due to the applied strain is

1.  60 Ω

2.  240 x 10-6 Ω

3.  240

4.  60 x 10-6 Ω

4

240 x 10-6 Ω

Explanation :
No Explanation available for this question

# The measurement of Hall coefficient of a semiconductor with one type of charge carrier gives the information about

1.  Sign of charge carrier

2.  density of charge carrier

3.  both sign and density of charge carrier

4.  mass of the charge carrier

4

both sign and density of charge carrier

Explanation :
No Explanation available for this question

# A piezoelectric crystal has a thickness of 2.5 min and a voltage sensitivity: of 0.05 Vm/N. The piezoelectric crystal is subjected to an external pressure of 1.6 x 106N/m2, then the corresponding output voltage is

1.  200 volts

2.  3.2 x 109 volts/m of thickness

3.  6.07 x10-9V/(m3/New)

4.  200.m volts

4

200 volts

Explanation :
No Explanation available for this question

# A 4-digit DVM (digital voltmeter) with a 100-mV -lowest full scale range would have a sensitivity of how much value while resolution of this DVM is 0.0001

1.  0.1 mV

2.  0.01 mV

3.  1.0 mV

4.  10 mV

4

0.01 mV

Explanation :
No Explanation available for this question

# The natural frequency of oscillation will be

1.  4.41 k Hz

2.  10 kHz

3.  5.25 kHz

4.  6.31 kHz

4

6.31 kHz

Explanation :
No Explanation available for this question

# The value of critical resistance is

1.  490Ω

2.  600Ω

3.  270Ω

4.  504Ω

4

504Ω

Explanation :
No Explanation available for this question

1.  521Ω

2.  450Ω

3.  502Ω

4.  530Ω

4