BASIC ELECTRICAL PART 4
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Attempt Free BASIC ELECTRICAL PART 4 Here. Read The Important Electrical MCQ From Below.
(a) 1400Ω
(b) 60Ω
(c) 960Ω
(d) 325Ω
Answer
[2] The symbol for the unit of temperature coefficient of resistance is:
(a) Ω /°C
(b)Ω
(c) °C
(d) Ω /Ω°C
Answer
BASIC ELECTRICAL PART 4
[3] The length of a certain conductor of resistance 100Ω is doubled and its cross-sectional area is halved. Its new resistance is:
(a) 100Ω
(b) 200Ω
(c) 50Ω
(d) 400Ω
Answer
[4] Voltage drop is the:
(a) Maximum potential
(b) Difference in potential between two points
(c) Voltage produced by a source
(d) Voltage at the end of a circuit
Answer
[5] The largest number of 100W electric light bulbs which can be operated from a 240V supply fitted with a 13A fuse is:
(a) 2
(b) 7
(c) 31
(d) 18
Answer
BASIC ELECTRICAL PART 4
[6] When an atom loses an electron, the atom:
(a) Becomes positively charged
(b) Disintegrates
(c) Experiences no effect at all
(d) Becomes negatively charged
Answer
[7] The energy used by a 1.5kW heater in 5 minutes is:
(a) 5 J
(b) 450 J
(c) 7500 J
(d) 450 000 J
Answer
[8] The unit of resistivity is:
(a) ohms
(b) ohm millimetre
(c) ohm metre
(d) ohm/metre
Answer
BASIC ELECTRICAL PART 4
[9] A resistor marked as4K7G indicates a value of:
(a) 47Ω ±20%
(b) 4.7Ω k ±20%
(c) 0.47Ω ±10%
(d) 4.7 kΩ ±2
Answer
[10] The resistance of a 2 km length of cable of cross-sectional area 2mm2 and resistivity of 2×10-8Ω m is:
(a) 0.02Ω
(b) 20Ω
(c) 0.02mΩ
(d) 200Ω
Answer
[11] A piece of graphite has a cross-sectional area of 10mm2. If its resistance is 0.1Ω and its resistivity 10×108 Ωm, its length is:
(a) 10 km
(b) 10 cm
(c) 10 mm
(d) 10 m
Answer
BASIC ELECTRICAL PART 4
[12] A nickel coil has a resistance of 13Ω at 50°C. If the temperature coefficient of resistance at 0°C is 0.006/ °C, the resistance at 0°C is:
(a) 16.9Ω
(b) 10Ω
(c) 43.3Ω
(d) 0.1Ω
Answer
[13] A coil of wire has a resistance of 10 at
0°C. If the temperature coefficient of resistance for the wire is 0.004/
°C, its resistance at 100°C is:
(a) 0.4Ω
(b) 1.4Ω
(c) 14Ω
(d) 10Ω
Answer
[14] A colour coding of red-violet-black on a resistor indicates a value of:
(a) 27Ω ±20%
(b) 270Ω
(c) 270Ω ±20%
(d) 27Ω ±10%
Answer
BASIC ELECTRICAL PART 4
[15] An inductance of 10mH connected across a 100V, 50 Hz supply has an inductive reactance of
(a) 10π
(b) 1000π
(c) π
(d) π H
Answer
