Electrical Engineering MCQs

Page No. 338

If the efficiency of a machine is to be high, what should be low __________?


aInput power


bLosses


cTrue component of power


dkWh consumed


View Answer Losses

Resistance of a material always decreases if___________?


atemperature of material is decreased


btemperature of material is increased


cnumber of free electrons available become more


dnone of the above is correct



Electric current passing through the circuit produces_____________?


amagnetic effect


bluminous effect


cthermal effect


dall above effects


View Answer all above effects

An electric filament bulb can be worked from____________?


aD. C. supply only


bA. C. supply only


cBattery supply only


dAll above


View Answer All above

In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?


a length of heating element should be decreased


blength of heating element should be increased


clength of heating element has no effect on heating if water


d none of the above



A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will__________


adecrease


bincrease


cremain same


dheater will burn out



Which of the following quantities remain the same in all parts of a series circuit ____________?


aVoltage


bCurrent


cPower


d Resistance


View Answer Current

The thickness of insulation provided on the conductor depends on_____________?


athe magnitude of voltage on the conductor


bthe magnitude of current flowing through it


cboth A. and (b)


dnone of the above



The insulation on a current carrying conductor is provided__________?


ato prevent leakage of current


bto prevent shock


cboth of above factors


dnone of above factors


View Answer both of above factors

The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?


azero


bnegative


c positive


dabout 2 ohms per degree


View Answer Positive number

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