Electrical Engineering MCQs

Page No. 336

Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?


a9 times

✖


b 1/9 times

✓


c1/3 times

✖


d3 times

✖


View Answer 1/9 times

International ohm is defined in terms of the resistance of________________?


aa column of mercury

✓


b a cube of carbon

✖


ca cube of copper

✖


dthe unit length of wire

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View Answer a column of mercury

A substance whose molecules consist of dissimilar atoms is called____________?


a semi-conductor

✖


bsuper-conducto

✖


ccompound

✓


dinsulator

✖


View Answer compound

A field of force can exist only between_____________?


atwo molecules

✖


btwo ions

✓


ctwo atoms

✖


dtwo metal particles

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View Answer two ions

When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?


adecrease

✖


bincrease

✓


cremain constant

✖


dnone of the above

✖


View Answer increase

Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?


a1/9 times

✖


b 3 times

✖


c9 times

✓


dunchanged

✖


View Answer 9 times

74. Sparking occurs when a load is switched off because the circuit has high_________?


a resistance

✖


binductance

✓


ccapacitance

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d impedance

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View Answer inductance

Switching of a lamp in house produces noise in the radio. This is because switching operation produces________?


aarcs across separating contacts

✓


bmechanical noise of high intensity

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cboth mechanical noise and arc between contacts

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dnone of the above

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For testing appliances, the wattage of test lamp should be_____________?


a very low

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b low

✖


chigh

✓


dany value

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View Answer high

Bulbs in street lighting are all connected in_____________?


aparallel

✓


bseries

✖


cseries-parallel

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dend-to-end

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View Answer parallel

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