# Which of the following conditions are to be satisfied in the figure shown so that the common variable shaft of resistance R1 and R2 can be graduated in frequency to measure the frequency of E under balanced condition 1.R1=R3 2.C1=C3 3.R2= 2R4 4.R2=R4 Select the correct answer using the codes given below

1.  1 and 4

2.  1and 2

3.  2 and 4

4.  1, 2 and 3

4

1, 2 and 3

Explanation :
No Explanation available for this question

# The meter constant of a single-phase 240 V induction watthour meter is 400 revolutions per kWh. The speed of the meter disc for a current of 10 amperes Of 0.8 p.f lagging will be

1.  12.8 rpm

2.  16.02 rpm

3.  18.2 rpm

4.  21. 1 rpm

4

12.8 rpm

Explanation :
No Explanation available for this question

# Dummy strain gauges are used for

1.  compensation of temperature changes

2.  increasing the sensitivity of bridge in which they are included

3.  compensating for different expansion

4.  calibration of strain gauges

4

compensation of temperature changes

Explanation :
No Explanation available for this question

# Dummy strain gauges are used for

1.  compensation of temperature changes

2.  increasing the sensitivity of bridge in which they are included

3.  compensating for different expansion

4.  calibration of strain gauges

4

compensation of temperature changes

Explanation :
No Explanation available for this question

# In the Maxwell bridge as shown' in the figure below, the values of resistance Rx and inductance Lx of a coil are to be calculated after balancing the bridge. The component values are shown in the figure at balance. The values of Rx and Lx will respectively be

1.  375 ohm, 75 mH

2.  75 ohm, 150 mH

3.  37.5 ohm, 75 mH

4.   75 ohm, 75 mH

4

375 ohm, 75 mH

Explanation :
No Explanation available for this question

# In the bridge given in the figure, the reading of the high impedance voltmeter is

1.  zero

2.  6.66 V

3.  4.20 V

4.  3.33 V

4

3.33 V

Explanation :
No Explanation available for this question

# The Wheatstone bridge method of resistance measurement is idealy suitable for the measurement of resistance values in the range of

1.  0.001 ohm to 1 ohm

2.  0.1 ohm to 100 ohm

3.  100 ohm to 10 k-ohm

4.  100 k-ohm to 10-M ohm

4

0.1 ohm to 100 ohm

Explanation :
No Explanation available for this question

# The Coils having self-inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect them in series-opposing

1.  20mH

2.  10mH

3.  5mH

4.  zero

4

10mH

Explanation :
No Explanation available for this question

# When a line-to-ground fault occurs, the current in the phase is 100 A. The zero sequence current in this case will be

1.  zero

2.  33.3A

3.  66.6A

4.  100A

4

33.3A

Explanation :
No Explanation available for this question

# Capacitance Voltage Transformer (CVT) is used to

1.  improve the power factor of the transmission

2.  reduce losses in a transmission line

3.  connect instruments on the LT side

4.  reduce the incidence of overvoltage surges on transmission lines

4