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Parallel Circuits Online Exam Quiz

Important questions about Parallel Circuits. Parallel Circuits MCQ questions with answers. Parallel Circuits exam questions and answers for students and interviews.

1. Four 8 ? 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

Options

A : 18 W

B : 1.5 W

C : 48 W

D : 72 W

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

Options

A : 25 mA

B : 100 mA

C : 6.25 mA

D : 200 mA

3. A sudden increase in the total current into a parallel circuit may indicate

Options

A : a drop in source voltage

B : an open resistor

C : an increase in source voltage

D : either a drop in source voltage or an open resistor

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

Options

A : 60 mA

B : 15 mA

C : 135 mA

D : 31.25 mA

5. There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is

Options

A : 490 mA

B : 800 mA

C : 310 mA

D : 0 A

6. The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is

Options

A : 1.2 W

B : 4.8 W

C : 0.3 W

D : 12 W

7. Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is

Options

A : 12.5 ?

B : 200 ?

C : 20 K?

D : 50 ?

8. If one of the resistors in a parallel circuit is removed, the total resistance

Options

A : decreases

B : increases

C : remains the same

D : doubles

9. When a 1.6 k? resistor and a 120 ? resistor are connected in parallel, the total resistance is

Options

A : greater than 1.6 k?

B : greater than 120 ? but less than 1.6 k?

C : less than 120 ? but greater than 100 ?

D : less than 100 ?

10. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is

Options

A : 1 A

B : 7 A

C : unknown

D : the larger of the two

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

Options

A : 2.2 A

B : 137 mA

C : 1.8 A

D : 9.09 A

2. Six resistors are in parallel. The two lowest-value resistors are both 1.2 k?. The total resistance

Options

A : is less than 6 k?

B : is greater than 1.2 k?

C : is less than 1.2 k?

D : is less than 600 ?

3. If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is

Options

A : 50 mA

B : 70 mA

C : 120 mA

D : 40 mA

4. In a certain three-branch parallel circuit, R 1 has 12 mA through it, R 2 has 15 mA through it, and R 3 has 25 mA through it. After measuring a total of 27 mA, you can say that

Options

A : R 3 is open

B : R 1 is open

C : R 2 is open

D : the circuit is operating properly

5. 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

Options

A : 200 mA

B : 540 mA

C : 1.24 A

D : 900 mA

6. Addition of resistors in parallel increases total resistance and decreases total current.

Options

A : True

B : False

C :

D :

7. The total current divides among parallel resistors in a manner directly proportional to the resistance values.

Options

A : True

B : False

C :

D :

8. The sum of the currents into a junction is equal to the sum of the currents out of that junction.

Options

A : True

B : False

C :

D :

9. A parallel circuit acts as a current divider.

Options

A : True

B : False

C :

D :

10. Parallel resistors are connected between the same two points.

Options

A : True

B : False

C :

D :

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