Electrical Engineering MCQs

Page No. 142

Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers_____________?


a18 W


b1.5 W


c48 W


d72 W


View Answer 72 W

An oscillator converts __________?


apower into d.c. power


bpower into a.c. power


cmechanical power into a.c. powe


dnone of the above


View Answer power into a.c. power

A sudden increase in the total current into a parallel circuit may indicate______________?


aa drop in source voltage


ban open resistor


can increase in source voltage


deither a drop in source voltage or an open resistor



Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately_______________?


a2.3 A


b780 mA


c47 mA


d7.06 A


View Answer 7.06 A

In a five-branch parallel circuit, there are 12 mA of current in each branch. If one of the branches opens, the current in each of the other four branches is_______________?


a48 mA


b12 mA


c0 A


d3 mA


View Answer 12 mA

Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately___________?


a2.2 A


b137 mA


c1.8 A


d9.09 A


View Answer 1.8 A

each light bulb is 1.8 k. The current through each bulb is approximately___________?


a610 mA


b18 mA


c110 mA


d61 mA


View Answer 110 mA

Three lights are connected in parallel across a 120 volt source. If one light burns out_____________?


athe remaining two will glow dimmer


bthe remaining two will glow brighter


cthe remaining two will not light


dthe remaining two will glow with the same brightness as before



When an additional resistor is connected across an existing parallel circuit, the total resistance____________?


aremains the same


bdecreases by the value of the added resistor


c increases by the value of the added resistor


d decreases


View Answer decreases

Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 Ω, the current through each parallel resistor is____________?


a25 mA


b100 mA


c6.25 mA


d200 mA


View Answer 6.25 mA

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