83.

84.

86.

87.

88.

89.

90.

Which type of valve is used for very fine control of fluid flow ?
(A) Butterfly valve (B) Angle valve (C) Ball valve (D) Needle valve

Which of the following starters are used for starting a squirrel cage motor ?
(A) Star-delta starter (B) Auto-transformer starter
(C) Step-down transformer (D) All of these

Which of the following is false about D.O.L starters ?

(A) No-volt coil disconnects supply to the motor when the supply voltage is lower
(B) A thermal overload relay is provided to protect the motor

(C) Can be used without backup fuses

(D) Due to heavy starting current, their usage is limited beyond a certain motor
capacity

Which of the following are the features of an ELCB, MCB Circuit breaker ?
(A) Over current (B) Short circuit (൨൮ Earth leakage (D) All of these

What is cut-off factor of a fuse ?

(A) The current at which the fuse element melts

(B) Ratio between minimum fusing current and current rating

(C) The voltage at which fuse element melts

(D) Time taken by a fuse to interrupt the circuit in the event of a fault

To what limit of current beyond which Re-wirable fuses are not usually preferred ?
ಯ) 200A (B) 350A (0) 500A (0) 1250,

Which of the following relays designed to operate when current falls below a
predetermined value ?

(A) Electromagnetic relay (B) Current sensing relay

(0) Under-current relay (0) Latching relays

Which of the following is not a reason of motor running hot ?
(^) Open circuit winding (B) Short circuited capacitor
(C) Defective capacitor (D) Blown fuse

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