# Consider the following statements regarding the sources of error in a Q-meter. 1. a coil with a resistance R is connected in the direct measurement mode and if the residual resistance of the Q-meter -is 0,1,R, then the measured .Q of the coil would be 1.1 times the actual Q. 2.. If the inductance to be measured is less than 0.1μH, the error due to the presence of residual inductance cannot be neglected. 3. The presence of distributed capacitance in a coil modifies the effective Q of the coil. Of these statements

1.  1, 2 and 3 are correct.

2.  1 and 2 are correct

3.  2 and 3 are correct

4.  1 and 3 are correct

4

2 and 3 are correct

Explanation :
No Explanation available for this question

# An advantage with a VTVM has over a nonelectronic voltmeter is

1.  lower power consumption

2.  lower input impedance

3.  the ability to measure wider ranges of voltage and resistance

4.  greater portability

4

lower power consumption

Explanation :
No Explanation available for this question

# Which of the following are the advantages of a balanced bridge vacuum tube voltmeter in comparison with a conventional VTVM 1. Higher input impedance 2. Meter zero has less tendency to shift 3. Effects to changes due to variation of valve characteristics are minimised. 4. Power supply fluctuations have a smaller effect on the measuring circuit. Select the correct answer using: the codes given below:

1.  3 and 4

2.  1 and 2

3.  1, 2 and 3

4.  1, 2, 3 and 4

4

1, 2, 3 and 4

Explanation :
No Explanation available for this question

# In a digital voltmeter, the oscillator frequency is 400 kHz and ramp voltage falls from 8V to 0 V is 20 m sec. The number of pulses counted by the counter is

1.  800

2.  2000

3.  4000

4.  8000

4

8000

Explanation :
No Explanation available for this question

# A 3-bit weighted resistor DAC shown in the figure has VR = 2V and R1/R=2. For an input of 100, the output will be

1.  2 V

2.  -4 V

3.  2 V

4.  4 V

4

4 V

Explanation :
No Explanation available for this question

# Which one of the instruments should be used at M in the given figure for the measurement of Magnitude as well as direction of the displacement

1.  Permanent magnet moving coil voltmeter

2.  Vacuum Tube voltmeter (VTVM)

3.  Transistor voltmeter (TVM)

4.  Phase Sensitive Detector (PSD)

4

Phase Sensitive Detector (PSD)

Explanation :
No Explanation available for this question

# An integrating digital voltmeter measures

1.  true average value

2.  rms value

3.  peak value

4.  peak to peak value

4

true average value

Explanation :
No Explanation available for this question

# A 10 V full-scale voltmeter having 100 k-ohm / V sensitivity is used to measure the output of a photovoltaic cell having an internal resistance of 1 M-ohm. The voltmeter reads 5V. The voltage generated by the photovoltaic cell is

1.  5V

2.  10 V

3.  greater than 5 V but less than 10 V

4.  greater than 10

4

10 V

Explanation :
No Explanation available for this question

# A 53 Hz reed type frequency meter is polarized with d.c. The' new range frequency meter is

1.  106 Hz

2.  26.5 Hz

3.  53 Hz

4.  none of these

4

106 Hz

Explanation :
No Explanation available for this question

# An average reading VTVM use one diode connected in series with an external- resistance. A high value of series resistance is used so that the instrument should have

1.  a high input impedance

2.  a linear ν-i characteristics

3.  low power consumption

4.  all of these

4