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1.

Maximum efficiency of modern coal-fired steam-raising thermal power plants is restricted to about 0.35 (a low value), mainly because of
(a) low alternator efficiency
(b) high energy loss in boilers
(c) low steam turbine mechanical efficiency
(d) high energy loss from turbine exhaust to condenser

asked in Electrical Paper-2, 2007

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2.

Fig. 2 given below is the "equal-area" criterion diagram for the determination of transient stability limit of the power system shown in Fig. 1 for a fault on the transmission line.
What is the type of fault and the time of its clearing, from Fig. 2?

(a) Three-phase fault with instantaneous clearing
(b) Three-phase fault with subsequent clearing
(c) Single-line to ground fault with instantaneous clearing
(d) Single-line to ground fault with subsequent clearing

asked in Electrical Paper-2, 2007

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3.

An alternator having an induced emf of 1.6 pu is connected to an infinite bus of 1.0 pu. If the bus bar has reactance of 0.6 pu and alternator has reactance of 0.2 pu, what is the maximum power that can be transferred?
(a) 2 pu
(b) 2.67 pu
(c) 5 pu
(d) 6 pu

asked in Electrical Paper-2, 2007

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4.

Mho relay is usually employed for the protection of
(a) short lines only
(b) medium lines only
(c) long lines only
(d) any line

asked in Electrical Paper-2, 2007

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5.

What is the approximate breakdown strength of atmospheric air at NTP?
(a) 0.3 kV/cm
(b) 1.0 kV/cm
(c) 3 kV/cm
(d) 30 kV/cm

asked in Electrical Paper-2, 2007

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6.

What is the total power installed capacity (approximate) in India?
(a) 1,25,000 MW
(b) 1,75,000 MW
(c) 2,00,000 MW
(d) 50,000 MW

asked in Electrical Paper-2, 2007

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