Electrical Knowledge by Sachin Sir

Q) Thermal relays are used for protection of motors against over-current owing to A) Short circuits B) Heavy loads C) Earth fault D) All of these

Q) Purpose of backup protection is A) To increase the speed B) To increase a reach C) To leave no blind spot D) To guard against failure of primary

Q) Which of the quantity consists of SI unit as Candela? A) Velocity B) Impulse C) Luminous intensity D) Force

Q) The resistivity of the conductor depends on A) area of the conductor. B) length of the conductor. C) type of material. D) none of these.

Q) If 1 A current flows in a circuit, the number of electrons flowing through this circuit is A) 0.625 × 10^19 B) 1.6 × 10^19 C) 1.6 × 10 ^- 19 D) 0.625 × 10^ - 19

Q) Ward-Leonard control is basically a ___________ control method. A) Field control. B) Armature resistance control. C) Armature voltage control. D) Field diverter control.

Q) If field current is decreased in shunt dc motor, the speed of the motor A) remains same. B) increases. C) decreases. D) none of the above.