52,

53.

54.

55,

56.

57.

58.

59.

What is the new steady state frequency, if a 10 MW load increase occurs in an area with
frequency 50 Hz, governor regulation R=0.1 pa. and frequency dependent component of
load change D=0.8 p.u. on 100 MVA base ?

(A) 49.889 Hz (B) 49.537 Hz (©) 49.074 ۶ (D) 48.554 Hz

A circuit breaker is connected to a 132 kV bus bar. What is the maximum value of restriking
voltage across the contacts of the circuit breaker ?

(A) 216 kV (ए) 108 kv (€) 37335 kv (D) 264 kV

Current chopping occurs during :

(A) disconnection of capacitor

(8) lightning

(C) disconnection of transformer on no load
(D) short circuit fault

A 400 kV surge travels on an overhead line of surge impedance 400 Q towards its junction
with a cable which has a surge impedance of 40 ). What is the transmitted voltage ?

(A) 3636 kV (8) 72.73 kV ‏کا‎ -327.27kV (>) 400KV

Which of the following is an example of high frequency electric heating ?
(ക) salt bath furnace (8 induction furnace
(C) ടി arc furnace (D) resistance welding

An illumination on the working plane of 32 lux is required in a room 80 m X 15m. Assuming
a utilization factor of 0.5, lamp efficacy of 14 lumen/watt and candle power depreciation of
0.2, estimate the number of 200 W lamps required.

(५) 192 (8) 100 (೧) 80 (1) 36

The specified parameters for a slack bus in load flow analysis are :
(A) real power and reactive power

(B) ரவ power and voltage magnitude

)© voltage magnitude and phase angle

(D) reactive power and voltage magnitude

Which of the following is true for a suburban electric traction service ?
(ക) coasting period is longer

(B) free running period is longer

(3) coasling and free running periods are smaller

(12) none of the above is true

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