Join Us on Telegram

HPSSC Lineman, SSA, Electrician Online Mock Test-Set 1 

here we provide you [HPSSC Lineman, SSA, Electrician Online Mock Test, HPSSC Lineman, Sub Station Attendant, Electrician Online Mock Test]

Q 1. The S.I unit of electrical energy is

A) Watt

B) Volts

C) Ampere

D) Joule

Answer

D) Joule

Q 2. Which of the following is the cause of a speed error in induction type energy meter?

A) Incorrect position of brake magnets.

B) Incorrect adjustment of the position of shading bends.

C) Slow but continuous rotation of the aluminum disc.

D) Temperature variations

Answer

A) Incorrect position of brake magnets.
Speed of disc is is in inverse relation with position of permanent brake magnet. it prove braking of torque hence incorrect poosition of brake magnet causes speed error in induction type energy meter

  

Q 3. Which of the following produces braking torque in induction type energy meter?

A) Air damping

B) Eddy current

C) Spring

D) Gravity

Answer

Ans B) Eddy current
Exp-: In an induction type meter, permanent magnet near edge of aluminium disc forms braking system. This is done with help

Q 4. Which of the following is the cause of meter phase error in induction type meter?

A) Incorrect position of brake magnets.

B) Incorrect adjustment of the position of shading bends.

C) Slow but continuous rotation of the aluminum disc.

D) Temperature variations

Show Answer

Ans B) Incorrect adjustment of the position of shading bends.

Exp-: Exp-: Phase errors are introduced because the shunt magnet flux does not lag behind the supply voltage by exactly 90° due to some resistance of the coil. In order to eliminate this error, position of copper shading bands provide on the central limb of shunt magnet is adjusted

Q 5. Which of the following is used to avoid the errors due to creeping in the electrodynamometer-type energy meter?

A) Disc with large radius is used.

B) Disc with small radius is used.

C) Holes are drilled in the disc.

D) Very heavy disc is used.

Show Answer

Ans C) Holes are drilled in the disc.

Exp-: The creeping phenomenon can be reduced by making diametrically two opposite holes on the aluminium disc. The disc will come to rest with one of the hole coming under edge of a pole of the shunt magnet.