KSEB- Sub Engineer

by eees.in · Published June 13, 2020 · Updated August 23, 2020

 

#1. Number of slip rings used in a 3 phase synchronous motor ill be….?

4

3

2

1

#2. Hunting is prevented by 3 phase synchronous motor by…..?

short pitch winding

damper winding

dummy coils

compensating winding

#3. The usual value of slip of a 3 phase induction motor at stand still condition is about….?

0.1

0.8

1

0.05

#4. Graphite is used for in nuclear power plant as a….?

fuel

coolant

control rod

moderator

#5. The highest transmission voltage in kerala….?

400 kV

230 kV

110 kV

700 kV

#6. Ferranti effect on long over head line is experienced when it is…..?

no load

lightly loaded

on full load at upf

on full load at 0.8 pf lag

#7. The voltage of a particular bus can be controlled by controlling the….?

frequency

phase angle

reactive power of the bus

active power of the bus

#8. The insulation resistance of a cable of length 20 km is 1m, its insulation resistance of 100 km length is…?

5 Mohm

0.2 ohm

1 Mohm

25 ohm

#9. The buchholz relay is used for the protection of…..?

power transformers

induction motors

series motors

coolong fan

#10. An alternator generates an emf of 50 Hz at a speed of 1000 rpm. The number of poles on the generator is….?

4

6

8

10

N=120f/p

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