Electrical Engineering MCQs

Page No. 335

A rheostat differs from potentiometer in the respect that it_____________?


ahas lower wattage rating


b has higher wattage rating


chas large number of turns


doffers large number of tapping



Which of the following statement is correct_______________?


a A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator


b A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator


cA semi-conductor is one which con¬ducts only half of the applied voltage


d A semi-conductor is a material made of alternate layers of conducting material and insulator



The condition for the validity under Ohm’s law is that_______________?


aresistance must be uniform


bcurrent should be proportional to the size of the resistance


c resistance must be wire wound type


dtemperature at positive end should be more than the temperature at negative end



When current flows through heater coil it glows but supply wiring does not glow because______________?


a current through supply line flows at slower speed


b supply wiring is covered with insulation layer


c resistance of heater coil is more than the supply wires


dsupply wires are made of superior material



Temperature co-efficient of resistance is expressed in terms of___________?


aohms/°C


b mhos/ohm°C


cohms/ohm°C


dmhos/°C


View Answer ohms/ohm°C

A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?


a80 m


b60 m


c40 m


d20 m


View Answer 20 m

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?


a160 ohms


b 80 ohms


c 20 ohms


d10 ohms


View Answer 10 ohms

Ohm’s law is not applicable to__________?


a semi-conductors


bD. C. circuits


csmall resistors


dhigh currents


View Answer semi-conductors

Which method can be used for absolute measurement of resistances _______________?


a Lorentz method


bReleigh method


cOhm’s law method


dWheatstone bridge method


View Answer Lorentz method

Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?


a3/2 Q


b6 Q


c4 Q


d8/3 Q


View Answer 4 Q

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