56.

57.

58.

59.

60,

61,

62,

One of the diode 01 ೩ bridge rectifier connected to 100 50 Hz AC input is found to be
damaged. The DC output of the eircuit is 90 V. The minimum value of PIV of the diode
required for replacement 15 :

(A 45V (8) 30V
(9 100 ४ (10) 150V

You are working with a fully automatic star delta starter. You notice that when start switch
is pressed the motor starts in star but does not change to delta. The trouble will be in :

(A) Delta contactor 8) Timer and its circuit
(0) Star contactor (D) 1176 ೧೧೧೩೧೬೦೯

Watt-hour meter is classified as a :
(^) Deflecting instrument (18) Indicating instrument
)© Recording instrument (D) Integrating instrument

Twao pin sockets should not be used in domestic wiring unless the appliance to be connected
38 :

(ಗಿ) Double earthed (13) Double insulated
(0 Controlled by ELCB (D) Controlled by MCB

As load on induction motor increases its power factor :
(ಗ) Remain constant
(B) Goes on decreasing
(C) Goes on increasing over after full load
(D) Goes on increasing up to full load and then it falls again

During no load test of a 3 phase induction motor, the motor draws power :
(5) For core loss and copper loss
(B) For copper loss and windage-friction loss
(C) For core loss and windage-friction loss
(D) Only for very small copper loss

The recent method of smooth speed control of a three-phase induction motor over a wide
range is :

(ക Frequency control method (18) Rotor resistance contral method

(C) Voltage control method (12) None of the above methods

Rotor bars of squirrel cage rotor are sometimes skewed :
(A) To prevent rotor from aligning and locking up with stator
(0) To give more uniform torque
(0) To reduce humming noise
(D) ‏سط‎ to all above reasons

088/2016 10 A