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Circuits related questions and answers

Circuits related questions and answers

1. 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

A. 55 Ω

B. 5.5 Ω

C. 50 Ω

D. 9 Ω

ANS : B

2. 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

A. 48 mA

B. 12 mA

C. 0 A

D. 3 mA

ANS : B

3. 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

A. 1 A

B. 7 A

C. unknown

D. the larger of the two

ANS : B

4. When an additional resistor is connected across an

existing parallel circuit, the total resistance

A. remains the same

B. decreases by the value of the added resistor

C. increases by the value of the added resistor

D. decreases

ANS : D

5. When a 1.6 kΩ resistor and a 120Ω resistor are connected

in parallel, the total resistance is

A. greater than 1.6 kΩ

B. greater than 120 but less than 1.6 kΩ

C. less than 120 but greater than 100 Ω

D. less than 100 Ω

ANS : C

Circuits related questions and answers

6. 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

A. 50 mA

B. 70 mA

C. 120 mA

D. 40 mA

ANS : B

7. Three lights are connected in parallel across a 120 volt

source. If one light burns out,

A. the remaining two will glow dimmer

B. the remaining two will glow brighter

C. the remaining two will not light

D. the remaining two will glow with the same brightness as before

ANS : D

8. 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

A. 12.5 Ω

B. 200 Ω

C. 20 KΩ

D. 50 Ω

ANS : C

9. A set of Christmas tree lights is connected in parallel

across a 110 V source. The filament of each light bulb is 1.8

k. The current through each bulb is approximately

A. 610 mA

B. 18 mA

C. 110 mA

D. 61 mA

ANS : D

10. The power dissipation in each of four parallel branches

is 1.2 W. The total power dissipation is

A. 1.2 W

B. 4.8 W

C. 0.3 W

D. 12 W

ANS : B


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