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GATE EE 2018 EXAM:Electrical Machines Quiz 11
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Question 1
In an alternator, power output is 40 kW and power rating is - 25 KVAR. Calculate the value of tanφ?
Question 2
A round rotor generator with internal voltage E1 = 2.0 p.u. and X = 1.1 p.u. is connected to a round rotor synchronous motor with internal voltage E2 = 1.3 p.u. and X = 1.2 p.u. The reactance of the line connecting the generator to the motor is 0.5 p.u. when the generator supplies 0.5 p.u. power, the rotor angle difference between the machines will be
Question 3
A lossless power system has to serve a load of 250 MW. There are two generators (G1 and G2) in the system with cost curves C1 and C2 respectively defined as follows:
C1(PG1) = PG1 + 0.055 × PG12
C2(PG2) = 3PG2 + 0.03 × PG22
Where PG1 and PG2 are the MW injections from generator G1 and G2 respectively. Then, the minimum cost dispatch will be
C1(PG1) = PG1 + 0.055 × PG12
C2(PG2) = 3PG2 + 0.03 × PG22
Where PG1 and PG2 are the MW injections from generator G1 and G2 respectively. Then, the minimum cost dispatch will be
Question 4
The direct axis and quadrature axis reactances of a salient pole alternator are 1.2 p.u and 1.0 p.u respectively. The armature resistance is negligible. If this alternator is delivering rated kVA at up of and at rated voltage then its power angle is
Question 5
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is
Question 6
In relation to the Synchronous Machines, which one of the following statements is false?
Question 7
The angle δ in the swing equation of a synchronous generator is the
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