NEA OLD QUESTION MCQ | ELECTRICAL SUPERVISOR | 2073/03/24
1. Three equal resistors when connected in series are equivalent 90 watt. Their equivalent watt when connected in parallel will be.
a) 270 w
b) 30 w
c) 810 w
d) 10 w
Answer: c
2. For which of the following substances, resistance decreses with temperature?
a) carbon
b) copper
c) mercury
d) platinum
Answer: a
3. Two electric bulb have resistances in the ratio of 1:2 if they are connected in the series, the energy consume in them are in the ratio of
a) 1:2
b) 4:1
c) 1:1
d) 2:1
Answer: a
4. In a delta/star connected distribution transformer
a) primary current is higher than secondary
b) primary current is equal to secondary
c) primary current is lower than secondary
d) secondary current is lower than primary
Answer: c
5. During normal condition lighting arrestor has
a) short circuit
b) separate voltage path
c) open circuit
d) separate current path
Answer: c
6. When using standard voltmeter to measure AC voltage, what type of measurement will voltmeter indicate
a) peak to peak
b) peak value only
c) average value
d) RMS value
Answer: d
7. Which of the following wire has greater cross-sectional area?
a) 18 SWG
b) 12 SWG
c) 20 SWG
d) 22 SWG
Answer: b
8. LED lights stands for
a) light emitting diode
b) light efficiency diode
c) light effecting diode
d) light ensuring diode
Answer: a
9. A tap changer is used on a transformer for adjusting
a) primary voltage
b) secondary voltage
c) primary & secondary voltage
d) generation voltage
Answer: b
10. In a pure capacitive circuit
a) voltage leads the current by 90°
b) current leads the voltage by 90°
c) voltage leads the current by 30°
d) current leads the voltage by 30°
Answer: b
11. In three phase delta connection
a) line voltage = phase voltage
b) line voltage = 1.73 phase voltage
c) phase voltage = 1.73 line voltage
d) line current = phase current
Answer: a
12. During the operation of lead acid battery hydro meter is used for the measurement of
a) terminal voltage
b) specific gravity of electrolyte
c) water contain of electrolyte
d) acid contain of electrolyte
Answer: b
13. One of the main function of buchholz relay in transformer
a) To give the alarm signal of low oil level
b) To give the alarm signal of short circuit at HT terminals
c) To give the alarm signal of short circuit at LT terminals.
d) To give the alarm signal of lightning
Answer: a
14. The synchronous speed of a four poles three phase induction motor is
a) 1000 rpm
b) 2000 rpm
c) 1500 rpm
d) 800 rpm
Answer: c
15. The magnetic strength of coil depends on
a) current direction
b) amount of the current
c) voltage direction
d) flux direction
Answer: b
16. The earth resistance does not depend on
a) soil conditions
b) size & spacing of earth electrodes
c) types of earthing
d) depth of earth pit
Answer: c
17. Before the insulation test of an electrical installation make sure that
a) main switch is off
b) main fuses are taken out
c) all switch are in on position
d) all of the above
Answer: d
18. Which types of insulations are used on 132 kv transmission lines?
a) pin type
b) disc type
c) shackle type
d) strain type
Answer: b
19. A single transformer has a name plate with the voltage rating of 440/220 v. What is the ratio of primary and secondary voltages?
a) 2:1
b) 1:2
c) 2:4
d) 4:2
Answer: a
20. Desire vertical spacing of shackle insulators in a 440 v overhead distribution
pole is
a) 0.85 m
b) 0.95 m
c) 0.55 m
d) 0.28 m
Answer: d
21. Generally energy meter for house holds NEA metering are of
a) Induction type
b) implusion type
c) shunt type
d) series type
Answer: a
22. Popular size of GI earthing plate is
a) 60*60*6mm
b) 600*600*6mm
c) 1000*1000* 10mm
d) 1600*1600*16mm
Answer: b
23. Which is the necessary equipment in the distribution sub station
a) power transformer
b) circuit breakers
c) prime movers
d) isolators
Answer: b
24. Maximum permissible number of 4 sq mm pvc insulated copper wires that can be drawn in a 25 mm via rigid conduit?
a) 6
b) 10
c) 12
d) 15
Answer: a
25. The current in a wire
a) Depends only on the voltage applied
b) Depends only on the resistance of the wire
c) Depends on both applied voltage and resistance of the wire
d) Depends on the length of the wire
Answer: c
26. Nepal electricity authority (NEA) owned rahughat hydro electric project is in
a) Doti district
b) myagdi district
c) kalikot district
d) acham district
Answer: b
27. How should a fuse breaker be installed in a circuit ?
a) parallel to load
b) series with the load
c) in any way possible
d) at earthing point
Answer: b
28. A 3 phase, 4 wire system is commonly used for
a) primary distribution
b) secondary distribution
c) primary transmission
d) secondary transmission
Answer: b
29. Normally the power factor fincandescent light load is
a) 1.0
b) 0.5
c) 0.0
d) 0.6
Answer: a
30. The only one seasonal storage type hydro power station is
a) kulekhani
b) panauti
c) pharphing
d) devight
Answer: a
31. MCCB is use for
a) For short circuit protection only
b)For over load protection only d) surge protection only
c) For short circuit and over load protections
d) surge protection only
Answer: c
32. Nepal electricity authority (NEA) does not have
a) hydro power plant
b) thermal power plant
c) diesel power plant
d) solar power plant
Answer: b
33. Starting of 20 HP 3-phase induction motor requires
a) MCB starter
b) DOL starter
c) switch fuse starter
d) star/delta starter
Answer: d
34. Five lamps of equal resistance value are connected in series with a supply of 125 v DC. the voltage across the each lamp is
a) 25 v
b) 125 v
c) 5 v
d) 12.5 v
Answer: a
35. The selection of overhead transmission line ACSR conductor depends on
a) length of transmission line
b) power to be carried
c) permissible voltage drop
d) all of the above
Answer: d
36. Suitable turbine for high head hydro power plants is
a) pelton
b) francis
c) kaplan
d) propeller
Answer: a
37. For the improvement of power factor which device is used in a sub station?
a) synchronous reactor
b) synchronous condenser
c) series capacitor
d) parallel capacitor
Answer: b
38. In sub station current transformer is used for
a) measurement and protection
b) voltage measurement
c) sub station power supply
d) battery charging
Answer: b
39. Reaction turbine are suitable for
a) high head load discharge
b) low head low discharge
c) high head high discharge
d) low head high discharge
Answer: d
40. Location of a surge tank, in an hydro electric power station is near
a) turbine
b) tailrace
c) reservoir
d) dam
Answer: a
