Mr Electro Test Quiz for NEA, NTC, PSC, CANN preparation students for level 3, level 4, level 5, level 6, level 7 i.e Electrician, Foreman, Supervisor, Assistant Engineer, & Engineer. This is about NEA LokSewa || NEA question paper model 12 to help you in preparing for your study.
Model question set 12
Multiple Choice Question
1. If the slip of a 3-phase induction motor increases the p.f. of the rotor circuit
is increased
is decreased
ramains same
none
2. The rotor current in a 3-phase induction motor is ___ slip.
inversely proportional to
directly proportional to
independent of
none
3. If a transformer core has air gaps then
reluctance of magnetic path is decreased
hysteresis loss is decreased
magnetising current is greatly increased
eddy current is increased
4. In a dynamometer wattmeter the moving coil is the
current coil
potential coil
a or b
none
5. When the speed of a DC motor increases its armature current
increases
decreases
remains same
none
6. Which single-phase motor has the lowest speed?
universal
shaded pole
hysteresis
repulsion
7. The field winding of an alternator is _____ excited.
DC
AC
both a & b
none
8. The alternator driven by ____ do not have a tendency to hunt.
diesel engines
water turbines
steam turbines
none
9. The most commonly used material for insulator of overhead transmission lines is
mica
glass
PVC
procelain
10. A booster is connected in ____ with the feeder.
parallel
series
series-parallel
none
11. A Buchholz relay is
a gas actuated relay
used in oil immersed transformers
connected between main tank and conservator
all
12. An under voltage relay is mostly used for
transformer protection
bus-bar protection
motor protection
feeder protection
13. A photo-diode is normally
forward biased
reverse biased
neither a nor b
none
14. A thyristor is a
P-N-P device
N-P-N device
P-N-P-N device
P-N device
15. The color of sodium lamp is
blue
yellow
red
white
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