B:-4 MJ/MVA

C:-8 MJ/MVA

D:-16 MJ/MVA

Correct Answer:- Option-A

Question49:-For transient stability analysis, as long as equal area criterion is
satisfied, the max angle to which rotor angle can oscillate is

A:-90°

B:-45°

C:-Greater than 90°
D:-Less than 90°

Correct Answer:- Option-C

Question50:-A 4 pole turbo generator is rated at 150 MVA, 14 KV, 60 Hz. Its inertia
constant is 12 MJ/MVA. if the input of the generator is suddenly increased to 80 MW
for a load of 60 MW. The magnitude of the acceleration of the rotor will be

(in ele deg / sec2)

A:-132
B:-108
C:-120
D:-123
Correct Answer:- Option-C

Question51:-A step up chopper has source voltage 25 V and output voltage 50 V. If
the pulse width is 10 us, the chopping frequency will be

A:-50 kHz
B:-100 kHz
C:-5 kHz
D:-10 kHz
Correct Answer:- Option-A
Question52:-A single phase fully controlled rectifier fed DC motor can operate is :
A:-Both forward motoring and reverse
B:-Reverse motoring mode only
C:-Forward braking mode
D:-Both reverse motoring and reverse braking mode
Correct Answer:- Option-A

Question53:-An SCR has a half cycle surge current rating of 1500 A for 50 Hz
supply. Its one cycle surge current rating will be

A:-1500 A
B:-2121.32A
C:-1060.67 A