8. For synchronous condensers, the p.f. improvement apparatus should be located
ID: 2083998 • Letter: 8
Question
8. For synchronous condensers, the p.f. improvement apparatus should be located at __________.
1. Sending end.
2. Receiving end.
3. Both (a) and (b).
4. None of these.
9.A disadvantage of synchronous condenser is:
1. Continuous losses in motor.
2. High maintenance cost.
3. Noisy.
4. All of the above.
10.The smaller the lagging reactive power drawn by a circuit, its p.f. will be __________.
1. Better.
2. Poorer.
3. Unity.
4. None of these.
11.kVAR is equal to __________.
1. kW tan .
2. kW sin .
3. kVA cos .
4. None of these.
12.For a particular power, the current drawn by the circuit is minimum when the value of p.f. is __________.
1. 0.8 lagging.
2. 0.8 leading.
3. Unity.
4. None of these.
13.Synchronous capacitors are normally ____________ cooled.
0. Air.
1. Oil.
2. Water.
3. None of these.
14.To improve the p.f. of 3- circuits, the size of each capacitor when connected in delta with respect to when connected in star is __________.
1. 1/6th.
2. 1/4th.
3. 3 times.
4. 1/3rd.
15.The p.f. improvement equipment is always placed __________.
1. At the generating station.
2. Near the transformer.
3. Near the apparatus responsible for low p.f.
4. Near the bus bar.
16.A synchronous machine has higher capacity for:
1. Leading p.f.
2. Lagging p.f.
3. It does not depend upon the p.f. of the machine.
4. None of these.
17.If a synchronous machine is underexcited, it takes lagging VARs from the system when it is operated as a __________.
1. Synchronous motor.
2. Synchronous generator.
3. Synchronous motor as well as generator.
4. None of these.
18.A synchronous phase modifier as compared to synchronous motor used for mechanical loads has __________.
1. Larger shaft and higher speed.
2. Smaller shaft and higher speed.
3. Larger shaft and smaller speed.
4. Smaller shaft and smaller speed.
19.The phase advancer is mounted on the main motor shaft and is connected in the __________ motor.
1. Rotor.
2. Stator.
3. Core.
4. None of these.
20.Industrial heating furnaces such as arc and induction furnaces operate on __________.
1. Very low lagging p.f.
2. Very low leading p.f.
3. Very high leading p.f.
4. None of these.
21.If a synchronous machine is overexcited, it takes lagging VARs from the system when it is operated as:
1. Synchronous motor.
2. Synchronous generator.
3. Synchronous motor as well as generator.
4. None of these.
Explanation / Answer
8) 2
9) 4
10) 1
11) 1
12) 3
13) 1
14) 4
15) 3
16) 3
17) 3
18) 3
19) 1
20) 1
21) 3
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