Practice Test: Question Answer (Question No 21-30)
1. Which of the following parameter will be more for 16 gauge copper wire in comparison to 14 gauge copper wire?
- (A) Cost
- (B) Strength
- (C) Resistance
- (D) Weight
2. The length of wire having resistance of 1 ohm/m in a heater rated at 1000 W and 250 V will be
- (A) 250 m
- (B) 125 m
- (C) 62.5 m
- (D) 500 m
3. Power dissipated in a pure capacitor is
- (A) Minimum
- (B) Maximum
- (C) Infinite
- (D) Zero
4. The size of the feeder is determined primarily by
- (A) The current
it is required to carry
- (B) The
percentage variation of voltage in the feeder
- (C) The
voltage across the feeder
- (D) The distance
over which the transmission is made
5. Non-conductors whose polarization is caused by an electric field are known as
- (A) Dielectric
- (B) Super-conductors
- (C) Semi-conductors
- (D) Insulators
6. If the diameter of a conductor is double, then its resistance will be reduced to
- (A) Half
- (B) One-fourth
- (C) One-eight
- (D) One-sixteenth
7. One of difficulties encountered with super-conductors is
- (A) The
materials become highly magnetic
- (B) Strength is
reduced
- (C) Resistance
is increased
- (D) Maintenance
of low temperature
8. The inductance of a coil can be increased by
- (A) Decreasing
number of turns
- (B) Increasing
core length
- (C) Using core
material of high relative permeability
- (D) All of the
above
9. The resistance of a lamp rated at 240 V and 60 watts equal to
- (A) 60 ohms
- (B) 120 ohms
- (C) 240 ohms
- (D) 480 ohms
10. Two resistances of 100 ohms and 0 ohm are connected in parallel. The overall resistance will be
- (A) 100 ohms
- (B) 50 ohms
- (C) Zero ohm
- (D) Any one of
the above
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