A) 0.707
B) 0.637
C) 1.21
D) 1.1 (√)
2. Resistance of 230 v 100 w incandescent lamp is
A) 2.3 ohm
B) 529 ohm (√)
C) 4.3 ohm
D) 625 ohm
3. Temperature coefficient of resistance is measured in
A) Ohm/°c (√)
B) Ohm2/0°c
C) Ohm –°c
D) Ohm2 –0°c
4. Example of paramagnetic material is
A) Nickel
B) Graphite
C) Air (√)
D) Steel
5. Working voltage of megger for testing domestic installations are
A) 200 v
B) 230 v
C) 500 v(√)
D) 440 v
6. The power factor of purely resistive circuit is
A) Unity (√)
B) Zero
C) Lagging
D) Leading
7. The capacitive reactance is measured in
A) Farad
B) Ohm(√)
C) Ohm/Farad
D) Farad/ohm
8. Permalloy is an alloy containing
A) Nickel and iron(√)
B) Tin and lead
C) Nickel and chromium
D) Nickel and copper
9. For a sinusoidal current crest factor is
A) 1.11
B) 1.414 (√)
C) 4.44
D) 0.637
10. The specific gravity of electrolyte in a fully charged lead acid battery is
A) 1.285(√)
B) 1.100
C) 1.175
D) 2.585
11. The composition of tin and lead used in electrician solder are
A) 50%, 50%
B) 60%, 40% (√)
C) 65%, 35%
D) 90%, 10%
12. The material used as negative electrode in lithium cell is
A) Lithium
B) Carbon
C) Zinc
D) Graphite(√)
13. The reciprocal of frequency is known as
A) Time period (√)
B) Amplitude
C) Time constant
D) Reactance
14. The number of electrons in an aluminium atom is
A) 13 (√)
B) 18
C) 29
D) 43
15. The capacity of a lead acid battery is expressed in
A) Watt hour
B) Ampere hour(√)
C) Volt-ampere
D) Kilo watt hour
16. The unit of permeability is
A) Ampere-turns
B) Weber/m2
C) No unit (√)
D) Tesla
17. Relative permittivity of vacuum is
A) 8.854
B) 8.854 × 10–12 (√)
C) Unity
D) Zero
18. The ohmmeter reading for a shorted capacitor is
A) Zero (√)
B) Infinity
C) Few mega ohms
D) Few kilo ohms
19. The equivalent of one picofarad is
A) 1012F
B) 1/1012 (√)
C) l0–9F
D) 1/106 F
20. A parallel circuit is used as divider for
A) Conductance
B) Voltage
C) Power
D) Current(√)
21. The electrical instrument used to measure current is
A) Galvanometer
B) Ammeter(√)
C) Potentiometer
D) Voltmeter
22. The maximum number of lighting points that can be connected in a circuit is
A) 5
B) 10 (√)
C) 8
D) 12
23. One B.O.T. unit is equal to
A) 746 w
B) 735 w
C) 1000 wh (√)
D) 3000 wh
24. The minimum distance between two plates in plate earthing which are parallel should be
A) 8 m (√)
B) 5 m
C) 12 m
D) 3 m
25. AC single phase energy meter record the energy in the unit of
A) Kilo volt ampere
B) Kilo watt hour(√)
C) Kilo watt
D) Volt-ampere
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