D:-Vibration
Correct Answer:- Option-B
Question87:-The frequency of electricity supply in India 15
A:-60 Hz
B:-45 Hz
C:-55 Hz
D:-50 Hz
Correct Answer:- Option-D
Question88:-The size of copper plate used in plate earthing system is
A:-60 cm x 60 cm x 3.15 mm
B:-60 cm x 60 cm x 6.3 mm
C:-30 cm x 30 cm x 3.15 mm
D:-60 cm x 60 cm x 3.3 mm
Correct Answer:- Option-A
Question89:-One Webber is equal to__ Maxwell.
A:-10000
B:-100000
C:-10000000
D:-1000000
Correct Answer:- Option-C
Question90:-The standard secondary out put of a current transformer is
A:-10A
B:-5A
7A
D:-3A
Correct Answer:- Option-B

Question91:-In two watt meter method of power measurement one watt meter shows negative reading the power factor of
the load is

A:-unity
B:-bellow 0.5 lagging
C:-0.8 lagging
D:-in between 0.5 and 0.8 lagging
Correct Answer:- Option-B
Question92:-The working principle of earth tester is
A:-Fall of potential method
-Wheatstone bridge principle
C:-Voltage divider method
D:-Meter bridge principle
Correct Answer:- Option-A
Question93:-The polarity of interpole is in the case of DC generator and motor is
A:-same as next main pole ahead in the case of motor and generator in the direction of rotation

B:-same as the next main pole behind in the case of motor and generator in the direction of rotation of motor and
generator

C:-same as next main pole behind in the case of generator and next main pole ahead in the motor in the direction of
rotation

D:-same as next main pole behind in the case of motor and same as next main pole ahead in the generator in the
direction of rotation

Correct Answer:- Option-D
Question94:-The distance between earth electrode and adjacent building should not less than
A:-2m
8:-1 ೧
ടന
D:-1.5 m
Correct Answer:- Option-D
Question95:-Type of cooling used in Distribution transformer is
A:-AN
B:-AN, OFN
C:-OB, AB
D:-AN, ON
Correct Answer:- Option-D