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Model Questions for SSC Junior Engineer EXAM - Electrical Engg set-4

1. The expression for total power output of a delta connected system in terms of phase voltage and current is given by

(a) 3VpIpcos?
(b) ?3VpIpcos?
(c) 1/? 3VpIpcos?
(d) 1/3 x VpIpcos?

2. In India, the synchronous generator generates

(a) 33 kV
(b) 66 kV
(c) 11 kilo - volts
(d) Either (a) or (b)

3. The synchronous generator is also called an

(a) DC generator
(b) AC generator
(c) Alternator
(d) Only (a) and (b)

4. The number of cycles of the induced emf per second is equal to

(a) No. of cycles per revolutions x no. of revolutions per hour
(b) No. of cycles per revolutions x no. of revolutions per second
(c) No. of cycles per revolutions / no. of revolutions per second
(d) No. of cycles per second x no. of revolutions per second

5. From full load to no load, the change of terminal voltage is more in case of

(a) Leading power factor
(b) Unity power factor
(c) Lagging power factor
(d) Both lagging and leading power factor compared to unity power factor

Study Kit for SSC Junior Engineer EXAM (Paper-1) 2017-2018

6. The two wattmeter method is applicable for

(a) Both star connected and delta connected system
(b) Only star connected system
(c) Only delta connected system
(d) None of these

7. The non salient pole type synchronous generator is driven by

(a) Steam engines
(b) Diesel engines
(c) All of these
(d) Hydraulic turbines

8. By using two wattmeter method, power can be measured in

(a) 3 - phase, 3 - wire system
(b) 3 - phase, 4 - wire system
(c) 3 - phase, 2 - wire system
(d) All of these

9. In delta connected system, the potential difference between line outers is

(a) Greater than the phase voltage
(b) Less than the phase voltage
(c) Equal to the phase voltage
(d) None of these

10. In a balanced 3-phase system, if one of the two wattmeter's reading is negative then the

(a) Reading should be taken after reversing the pressure coil
(b) Reading should be taken after reversing the current coil
(c) Reading should be taken as it is
(d) All of these