# At high frequency the accuracy of all the measuring meters

1.  increases

2.  decreases

3.  remains the same

4.  depends upon the type of meter.

4

decreases

Explanation :
No Explanation available for this question

# The braking torque provided by a permanent magnet, in a single phase energy meter can he changed by

1.  providing a magnetic shunt and changing its position

2.  changing the distance of the permanent magnet from the center of the revolving disc

3.  both (a) and (b)

4.  none of these

4

both (a) and (b)

Explanation :
No Explanation available for this question

# The power in d.c. circuit is measured with the help of ammeter and a voltmeter. The voltmeter is connected on the load side. The power indicated by the product of reading of two instruments (VI) is

1.  the power consumed in the load

2.  the sum of power consumed by load and the voltmeter

3.  the sum of power consumed by load and the ammeter

4.  none of these

4

none of these

Explanation :
No Explanation available for this question

# When testing, a coil having a resistance of 10 ohms, resonance occured When oscillator frequency was 10 MHz and the rotating capacitor was set at 500 / 2π pF. The effective value of the Q of the coil is

1.  200

2.  254

3.  314

4.  542

4

200

Explanation :
No Explanation available for this question

# Pulses of a frequency of 1 MHz are applied to the time base selector of a digital frequency meter which consists of 6 frequency dividers, each dividing the incoming frequency by a factor of 4th frequency divider starting from the input is

1.  1 ms

2.  10 ms

3.  100 ms

4.  1s

4

10 ms

Explanation :
No Explanation available for this question

# A series RLC circuit is used for measurement of inductance of a coil using resonant method. Reasonable conditions are produced by varying the capacitance of a thermo electric type ammeter guised in series with the circuit. Also an electronic voltmeter is connected across the tuning capacitor

1.  The condition of resonance are more reliably indicated when the ammeter reads maximum

2.  The conditions of resonance are more reliably indicated when the voltmeter connected across the capacitor reads maximum

3.  The condition of resonance are the same when both ammeter and voltmeter read maximum

4.  The conditions of resonance are indicated when both ammeter and voltmeter read minimum

4

The conditions of resonance are more reliably indicated when the voltmeter connected across the capacitor reads maximum

Explanation :
No Explanation available for this question

# A resistor of 10k-ohm with 5% tolerance is connected in series with a 5 k-ohms resistor at 10% tolerance. The tolerance limit of the series network will be

1.  5%

2.  6.67%

3.  10%

4.  8.38%

4

10\%

Explanation :
No Explanation available for this question

# If the Q-factor of a coil is measured by varying the frequency, then

1.  the plot between Q and frequency is linear

2.  the value of Q initially decreases with increase of frequency and afterwards it will increase with increase of frequency

3.  the value of Q initially increases with increase of frequency and afterwards it will decrease with increase of frequency

4.  the Q-factor remains constants irrespective of value of frequency

4

the plot between Q and frequency is linear

Explanation :
No Explanation available for this question

# A dc circuit can be represented by an internal voltage source of 50 V with an output resistance of 100 kΩ order to achieve accuracy better than 99% for voltage measurement across its terminals, the voltage measuring device should have a resistance of atleast

1.  10MΩ

2.  1MΩ

3.  10kΩ

4.  1kΩ

4

10MΩ

Explanation :
No Explanation available for this question

1.  1 kHz and 12

2.  1 kHz and 14

3.  2 kHz and 12

4.  2 kHz and 14

4