Electrical Engineering MCQs

Page No. 341

Which is the best conductor of electricity _______________?


aIron


b Silver


cCopper


d Carbon


View Answer Silver

Ohm’s law is not applicable to____________?


avacuum tube


bcarbon resistors


c high voltage circuits


d circuits with low current densities


View Answer vacuum tubes

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


a Copper


bAluminum


cCarbon


dBrass


View Answer Carbon

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


aElements have individual currents


bCurrents are additive


cVoltages are additive


d Power are additive


View Answer Power are additive

Two resistors are said to be connected in series when___________?


asame current passes in turn through both


bboth carry the same value of current


ctotal current equals the sum of branch currents


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



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


btwo in parallel and one in series


cthree in parallel


dthree in series



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


aManganin


b Porcelain


cCarbon


dCopper


View Answer Manganin

Current velocity through a copper conductor is___________?


athe same as propagation velocity of electric energy


bindependent of current strength


cof the order of a few ^.s/m


dnearly 3 x 108 m/s



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


b 6.4 A, 9.6 A


c4.6 A, 6.9 A


d 4.6 A, 9.6 A


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


b200 Ω


c 300 Ω


d400 Ω


View Answer 400 Ω

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