Electrical Engineering MCQs

Page No. 337

When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?


aA. C.


bD. C.


cany of above two


d none of the above


View Answer D. C.

In the case of direct current____________?


amagnitude and direction of current remains constant


b magnitude and direction of current changes with time


cmagnitude of current changes with time


dmagnitude of current remains constant



Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?


a100 W lamp will glow brighter


b 40 W lamp will glow brighter


cBoth lamps will glow equally bright


d 40 W lamp will fuse



In a lamp load when more than one lamp are switched on the total resistance of the load_____________?


a increases


bdecreases


cremains same


dnone of the above


View Answer decreases

When one leg of parallel circuit is opened out the total current will______________?


areduce


bincrease


cdecrease


dbecome zero


View Answer decrease

It becomes more difficult to remove_________________?


aany electron from the orbit


bfirst electron from the orbit


csecond electron from the orbit


d third electron from the orbit



Whether circuit may be AC. or D. C. one, following is most effective in reducing the magnitude of the current?


aReactor


bCapacitor


cInductor


dResistor


View Answer Resistor

A glass rod when rubbed with silk cloth is charged because__________?


ait takes in proton


b its atoms are removed


cit gives away electrons


dit gives away positive charge



Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as________?


a4 : 25


b25 : 4


c2 : 5


d5 : 2


View Answer 2 : 5

When electric current passes through a metallic conductor, its temperature rises. This is due to__________?


acollisions between conduction electrons and atoms


bthe release of conduction electrons from parent atoms


cmutual collisions between metal atoms


dmutual collisions between conducting electrons



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