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


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


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


d impedance


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


cboth mechanical noise and arc between contacts


dnone of the above



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


a very low


b low


chigh


dany value


View Answer high

Bulbs in street lighting are all connected in_____________?


aparallel


bseries


cseries-parallel


dend-to-end


View Answer parallel

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