# A bridge type rectifier meter and a thermo couple meter employ moving-coil movement for indication. Both are calibrated on a 100 Hz sinusoidal waveform. If a 100 Hz rectangular waveform is applied to each, the ratio of their readings will be

1.  2 : 1

2.  1.11 : 1

3.  1.41 : 1

4.  1.21 : 1

4

1.11 : 1

Explanation :
No Explanation available for this question

# A slide wire potentiometer has 10 wires at 1 m each. With the help of a standard voltage source of 1.018 V it is standardised by keeping the jockey at 101.8 cm. If the resistance of the potentiometer wires is 1000 ohm, then the value of the working current will be

1.  0.1 mA

2.  0.5 mA

3.  1 mA

4.  10 mA

4

1 mA

Explanation :
No Explanation available for this question

# The plug setting of a negative sequence relay is 0.2 A. The current transformer ratio is 5 : 1. The minimum. Value of line to line fault current for the operation of the relay is

1.  1 A

2.  1/1.732A

3.  1.732 A

4.  0.2/1.732 A

4

1.732 A

Explanation :
No Explanation available for this question

# Mho relay-is normally used for the protection of

1.  long transmission lines

2.  medium length lines

3.  short length lines

4.   no length criterion

4

long transmission lines

Explanation :
No Explanation available for this question

# The impedance value of generator is 0.2 p.u. on a base value of 11 kV, 50 MVA. The impedance value for a base value of 22 kV, 150 MVA is

1.  0.15 p.u.

2.  0.2 p.u.

3.  0.3.p.u.

4.   2.4 p.u.

4

0.15 p.u.

Explanation :
No Explanation available for this question

# In d.c. potentiometer measure-ments, a second reading is often taken after reversing the polarities of the d.c. supply and the unknown voltage and the average of the two reading is taken. This is with a view of eliminate the effects of

1.  ripples in the d.c. supply

2.  stray magnetic fields

3.  stray thermal emfs

4.  erroneous standardisation

4

stray thermal emfs

Explanation :
No Explanation available for this question

# The ratio of reset to pickup current of induction cup relay is approximately

1.  0.99

2.  1.0

3.  0.75

4.  none of these

4

0.99

Explanation :
No Explanation available for this question

# For full wave rectification, a four diode bridge rectifier is claimed to have the following advantages over a two diode circuit less expensive transformer smaller size transformer and suitability for higher voltage application of these

1.  only (1) and (2) are true

2.  only (1) and (3) are true

3.  only (2) and (3) are true

4.  all (1), (2) and (3) are true

4

all (1), (2) and (3) are true

Explanation :
No Explanation available for this question

# Law of intermediate temperature thermocouples allows, them to

1.  reference junction compensation

2.  meters for measurement without disturbing the circuit conditions

3.  extension wires of materials other than one used for making thermocouples

4.  both (b) and (c)

4

both (b) and (c)

Explanation :
No Explanation available for this question

# A reactance relay is

1.  voltage restrained directional relay

2.  directional restrained over-current relay

3.  voltage restrained over-Current relay

4.  none of these

4