NEA question paper level 4 || Electrical Level 4 2074

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Electrical Level 4 Foreman 2074 taken by LokSewa for NEA.

Multiple Choice
50x2=100 Marks

1. The most economical distribution system is
a) DC system
b) 3-phase, 3 wire ac
c) Single phase ac system
d) 3-phase, 4 wire ac
2. When there is dead end of line, which type of insulators are used?
a) Suspension insulators
b) Post type insulators
c) Pin type insulators
d) Strain insulators
3. A circuit is disconnected by isolators when
a) Line is energized
b) there is no current on line
c) line is on full load
d) circuit breaker is not open
4. Which of the following statement is true?
a) At higher voltage, the cost of transmission reduced
b) At higher voltage, the cost of transmission increased
c) At higher voltage, Efficiency decreased
d) All of the above
5. D.C. system in power stations and substations is supplied by
a) d.c. generators
b) d.c. battery
c) invertors
d) all of the above
6. The medium voltage sub transmission, in Kathmandu valley is
a) 11 kv
b) 33 kv
c) 66 kv
d) 220 kv
7. The main reason for using the high voltage for the long distance power transmission is
a) reduction in transmission losses
b) reduction in time of transmission
c) increase in system reliability
d) none of the above
8. Characteristics of arc quenching medium is
a) High dielectric strength
b) Non flammable
c) Less thermal conductivity
d) Both a and b
9. The earthing of the electrical equipment is necessary for the protection against
a) over loading
b) voltage fluctuation
c) danger of electric shock
d) high conductor temperature
10. Location of lightning arrester is near a
a) Generator
b) Transformer
c) Bus-bar
d) Circuit breaker
11. A Buchholz relay is used in the protection of
a) Generator
b) Bus-bar
c) Transformer
d) Transmission line
12. The rating of a fuse is expressed in terms of
a) Amperes
b) Volts
c) VAR
d) KVA
13. The advantage of neutral earthing is
a) Safety of personnel
b) reduction of earth fault current
c) elimination of arching ground
d) none of the above
14. Cross-flow turbine is also known as
a) Reaction Turbine
b) Impulse Turbine
c) Kaplan Turbine
d) All of the above
15. On occurrence of the fault on connected circuit, the circuit breaker operates
a) manually
b) automatically
c) manually through a control switch
d) depending upon the circuit breaker design
16. A capacitance of 0.05 µF equals
0.05 x 106 F
0.05 x 10_6 F
0.05 x 10_1² F
0.05 x 101² F
17. A rheostat is a form of
variable resistor
variable capacitor
potentiometer
thermocouple
18. The ratio of flux density to electric field intensity in the dielectric is called
permittivity
field intensity
permeability
elasticity
19. Internal resistance of the ideal voltage source is
infinite
equal to the load resistance
zero
to be determined
20. What is the conductance of a circuit having three 10 Ω resistor in parallel?
0.3 S
3.33 S
0.33 S
30 S

Answer are as follows

1. The most economical distribution system is
a) DC system
2. When there is dead end of line, which type of insulators are used?
d) Strain insulators
3. A circuit is disconnected by isolators when
b) there is no current on line
4. Which of the following statement is true?
a) At higher voltage, the cost of transmission reduced
5. D.C. system in power stations and substations is supplied by
b) d.c. battery
6. The medium voltage sub transmission, in Kathmandu valley is
a) 66 kv
7. The main reason for using the high voltage for the long distance power transmission is
a) reduction in transmission losses
8. Characteristics of arc quenching medium is
d) Both a and b
9. The earthing of the electrical equipment is necessary for the protection against
c) danger of electric shock
10. Location of lightning arrester is near a
b) Transformer
11. A Buchholz relay is used in the protection of
c) Transformer
12. The rating of a fuse is expressed in terms of
a) Amperes
13. The advantage of neutral earthing is
c) elimination of arching ground
14. Cross-flow turbine is also known as
b) Impulse Turbine
15. On occurrence of the fault on connected circuit, the circuit breaker operates
b) automatically
16. A capacitance of 0.05 μF equals
b) 0.05 x 10¯⁶ F
17. A rheostat is a form of
a) variable resistor
18. The ratio of flux density to electric field intensity in the dielectric is called
c) permeability
19. Internal resistance of the ideal voltage source is
c) zero
20. What is the conductance of a circuit having three 10 Ω resistor in parallel?
a) 0.3 S

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