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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