Objective Type Questions on Basic Electrical Engineering -Part16
[1] A 240V, 60W lamp has a working resistance of:(a) 1400O
(b) 60O
(c) 960O
(d) 325O
[2] The symbol for the unit of temperature coefficient of resistance is:
(a) O /�C
(b)O
(c) �C
(d) O /O�C
[3] The length of a certain conductor of resistance 100O is doubled and its cross-sectional area is halved. Its new resistance is:
(a) 100O
(b) 200O
(c) 50O
(d) 400O
[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
[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
[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
[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
[8] The unit of resistivity is:
(a) ohms
(b) ohm millimetre
(c) ohm metre
(d) ohm/metre
[9] A resistor marked as4K7G indicates a value of:
(a) 47O �20%
(b) 4.7O k �20%
(c) 0.47O �10%
(d) 4.7 kO �2
[10] The resistance of a 2 km length of cable of cross-sectional area 2mm2 and resistivity of 2�10-8O m is:
(a) 0.02O
(b) 20O
(c) 0.02mO
(d) 200O
[11] A piece of graphite has a cross-sectional area of 10mm2. If its resistance is 0.1O and its resistivity 10�108 Om, its length is:
(a) 10 km
(b) 10 cm
(c) 10 mm
(d) 10 m
[12] A nickel coil has a resistance of 13O at 50�C. If the temperature coefficient of resistance at 0�C is 0.006/ �C, the resistance at 0�C is:
(a) 16.9O
(b) 10O
(c) 43.3O
(d) 0.1O
[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) 0.4O
(b) 1.4O
(c) 14O
(d) 10O
[14] A colour coding of red-violet-black on a resistor indicates a value of:
(a) 27O �20%
(b) 270O
(c) 270O �20%
(d) 27O �10%
[15] An inductance of 10mH connected across a 100V, 50 Hz supply has an inductive reactance of
(a) 10p
(b) 1000p
(c) p
(d) p H
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