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Parallel Circuits

Study 25 Electrical Engineering MCQs with correct answers and explanations.

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21Electrical EngineeringMedium

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________?

A0 A

B48 mA

C12 mA

D3 mA

Correct answer

C. 12 mA

Explanation

The correct answer is 12 mA.

22Electrical EngineeringMedium

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________?

A540 mA

B200 mA

C900 mA

D1.24 A

Correct answer

D. 1.24 A

Explanation

The correct answer is 1.24 A.

23Electrical EngineeringMedium

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________?

A48 W

B72 W

C1.5 W

D18 W

Correct answer

B. 72 W

Explanation

The correct answer is 72 W.

24Electrical EngineeringMedium

An ammeter has an internal resistance of 50 Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately________?

A50 Ω

B5.5 Ω

C55 Ω

D9 Ω

Correct answer

B. 5.5 Ω

Explanation

The correct answer is 5.5 Ω.

25Electrical EngineeringMedium

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________?

A31.25 mA

B135 mA

C60 mA

D15 mA

Correct answer

A. 31.25 mA

Explanation

The correct answer is 31.25 mA.

21Electrical EngineeringMedium

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________?

A0 A

B48 mA

C12 mA

D3 mA

Correct answer

C. 12 mA

Explanation

The correct answer is 12 mA.

22Electrical EngineeringMedium

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________?

A540 mA

B200 mA

C900 mA

D1.24 A

Correct answer

D. 1.24 A

Explanation

The correct answer is 1.24 A.

23Electrical EngineeringMedium

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________?

A48 W

B72 W

C1.5 W

D18 W

Correct answer

B. 72 W

Explanation

The correct answer is 72 W.

24Electrical EngineeringMedium

An ammeter has an internal resistance of 50 Ω. The meter movement itself can handle up to 1 mA. If 10 mA is applied to the meter, the shunt resistor, RSH1, is approximately________?

A50 Ω

B5.5 Ω

C55 Ω

D9 Ω

Correct answer

B. 5.5 Ω

Explanation

The correct answer is 5.5 Ω.

25Electrical EngineeringMedium

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________?

A31.25 mA

B135 mA

C60 mA

D15 mA

Correct answer

A. 31.25 mA

Explanation

The correct answer is 31.25 mA.