64.

95.

66.

67,

68.

69.

70.

71.

72:

For 66 kV lines the number of insulator dises used is :

(^) 3 8) 6
© 10 m 12
AC resistance of a line conductor is more than its DC resistance because of ;
(A) Skin effect 18) Proximity effect
(C) Skin effect and proximity effect (1) None of these
What type of insulator will be used if the direction വ the transmission line is changed?
(A) Strain type (0) Shackle type
(¢) Pin type (D) Suspension type

The back emf set up in the armature of a synchronous motor depends on :
(A) Rotor speed only
(B) Rotor excitation only
(0) Rotor excitation and rotor speed
(D) Coupling angle, rotor speed and excitalion

The current drawn by an over excited synchronous motor will be :
(ക) Depending on the nature of load (B) At lagging power factor
(C) At leading power factor (1)) At unity power factor

Two alternators are sharing an inductive toad equally. What will be happened if the
excitation of one alternator is increased?

(ಗ) Another alternator will deliver more current
(B) Another alternator will deliver less current
(0 Both will continue to share load equally

(D) Both will deliver more current

A ceiling fan rotates slowly in either direction. The probable fault is :
(A) . An open in centrifugal switch (B) An open in capacitor
(C) Short in the capacitor (D) Blown fuse

In repulsion motor, maximum torque is developed when :
(A) Brush axis is at 130° electrical to the field axis
(ए) Brush axis is at 90° electrical to the field axis
(0 Brush axis is at 45° electrical to the field axis
(D) Brush axis coincides with the field axis

Starting winding of n single phase motor of a refrigerator is disconnected from the circuit by
means விக:

(^) Centrifugal switch (18) Magnetic relay

(@ Thermal relay (D) None of the ahove

11 035/2016
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