[1]Three generators are feeding a load of 100MW.The details of the generators are

Rating(MW) Efficiency() Regulation(p.u.) on 100MVA base

Generator-1 100 20 0.02

Generator-2 100 30 0.04

Generator-3 100 40 0.03

In the event of increased load power demand, which of the following will happen? [GATE 2009]

A. All the generators will share equal power

B.Generator – 3 will share more power compared to Generator – 1

C.Generator – 1 will share more power compared to Generator – 2

D.Generator – 2 will share more power compared to Generator – 3

Ans: None of the above

[2]A 500MW, 21kV, 50Hz, 3-phase, 2-pole synchronous generator having a rated p.f. =0.9, has a moment of inertia of 27.5 x 103 kg-m2. The inertia constant (H) will be [GATE 2009]

**A.2.44 s**

B.2.71s

C.4.88s

D.5.42s

[3]For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to [GATE 2009]

A.V

B.V2

**C.1/V2**

D.1/V

[4]How many 200W/220V incandescent lamps connected in series would consume the same total power as a single 100W/220V incandescent lamps? [GATE 2009]

A.Not possible

B.4

C.3

**D.2**

[5]Match the items in list I with the items in list II and select the correct answer using the codes given below the lists [GATE 2009]

A. a→2,b→3,c→4,d→1

**B. a→2,b→4,c→3,d→1**

C. a→4,b→3,c→1,d→2

D. a→4,b→1,c→3,d→2

[6]Match the items in list I with the items in list II and select the correct answer using the codes given below the lists [GATE 2009]

**A. a→2,b→1,c→3**

B. a→3,b→2,c→1

C. a→1,b→2,c→3

D. a→1,b→3,c→2

[7] For the system shown below, SD1 and SD2 are complex power demands at bus 1 and bus 2 respectively. If |V2|=1pu, the VAR rating of the capacitor (QG2) connected at bus 2 is [GATE2012]

A. 0.2 pu

**B. 0.268**

C. 0.312

D. 0.4pu

[8] A cylindrical rotor generator delivers 0.5 pu power in the steady-state to an infinite bus through a transmission line of reactance 0.5 pu. The generator no-load voltage is 1.5 pu and the infinite voltage is 1.5 pu. The inertia constant of the generator is 5MW-s/MV and the generator reactance is 1 pu.The critical clearing angle, in degrees, for a three-phase dead short circuit fault at the generator terminal is [GATE2012]

A. 53.5

B. 60.2

C. 70.8

**D. 79.6**

[9] Power is transfered from system A to system B by an HVDC link as shown in the figure.If the voltages VAB and VCD are as indicated in the figure, and I>0,then

A. VAB<0,VCD<0,VAB>VCD

B. VAB>0,VCD>0,VAB>VCD

**C. VAB>0,VCD>0,VAB<VCD**

D. VAB>0,VCD<0

[10] Consider a step voltage wave of magnitude 1pu travelling along a lossless transmission line that terminates in a reactor.The voltage magnitude across the reactor at the instant the travelling wave reaches the reactor is

**A. -1pu**

B. 1pu

C. 2pu

D. 3pu

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