Electrical Engineering MCQs

Page No. 140

If one of the resistors in a parallel circuit is removed, the total resistance_____________?


adecreases


bincreases


cremains the same


ddoubles


View Answer increases

The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is____________?


a200 mA


b540 mA


c1.24 A


d900 mA


View Answer 1.24 A

In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is __________?


aIncreased 2 times


bDecreased 4 times


c Increased 4 times


dDecreased 2 times


View Answer Decreased 2 times

Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is______________?


a60 mA


b15 mA


c135 mA


d31.25 mA


View Answer 31.25 mA

Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance______________?


ais less than 6 kΩ


bis greater than 1.2 kΩ


cis less than 1.2 kΩ


dis less than 600 Ω


View Answer is less than 600 Ω

In Colpitt’s oscillator, feedback is obtained___________?


aA. By magnetic induction


bBy a tickler coil


c From the centre of split capacitors


dNone of the above



The following resistors are in parallel across a voltage source: 220Ω , 470Ω , and 560Ω . The resistor with the least current is______________?


a 220 Ω


b470 Ω


c560 Ω


dimpossible to determine without knowing the voltage


View Answer 560 Ω

For an oscillator to properly start, the gain around the feedback loop must initially be_________?


a1


bGreater than 1


cLess than 1


d Equal to attenuation of feedback circuit


View Answer Greater than 1

In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that____________?


aR3 is open


bR1 is open


c R2 is open


dthe circuit is operating properly


View Answer R3 is open

Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is______________?


a25 Ω


b500 Ω


c100 Ω


d20 Ω


View Answer 25 Ω

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