Electrical Engineering MCQs

Page No. 341

Which is the best conductor of electricity _______________?


aIron

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b Silver

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cCopper

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d Carbon

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View Answer Silver

Ohm’s law is not applicable to____________?


avacuum tube

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bcarbon resistors

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c high voltage circuits

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d circuits with low current densities

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View Answer vacuum tubes

Which of the following materials has a negative temperature co-efficient of resistance?


a Copper

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bAluminum

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cCarbon

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dBrass

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View Answer Carbon

Which of the following statement is true both for a series and a parallel D. C. circuit?


aElements have individual currents

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bCurrents are additive

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cVoltages are additive

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d Power are additive

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View Answer Power are additive

Two resistors are said to be connected in series when___________?


asame current passes in turn through both

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bboth carry the same value of current

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ctotal current equals the sum of branch currents

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dsum of IR drops equals the applied e.m.f.

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You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect__________?


atwo in parallel

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btwo in parallel and one in series

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cthree in parallel

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dthree in series

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Which of the following material has nearly zero temperature co-efficient of resistance_________?


aManganin

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b Porcelain

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cCarbon

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dCopper

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View Answer Manganin

Current velocity through a copper conductor is___________?


athe same as propagation velocity of electric energy

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bindependent of current strength

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cof the order of a few ^.s/m

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dnearly 3 x 108 m/s

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A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is_____________?


a 6.4 A, 6.9 A

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b 6.4 A, 9.6 A

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c4.6 A, 6.9 A

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d 4.6 A, 9.6 A

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View Answer 6.4 A, 9.6 A

Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?


a100 Ω

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b200 Ω

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c 300 Ω

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d400 Ω

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View Answer 400 Ω

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