20 Questions

This is the MCQs for Gibilisco: CHAPTER 4 - BASIC DC CIRCUITS

Questions and Answers

- 1.Suppose you double the voltage in a simple dc circuit, and cut the resistance in half. The current will become:
- A.
Four times as great

- B.
Twice as great

- C.
The same as it was before

- D.
Half as great

- 2.A wiring diagram would most likely be found in:
- A.
An engineer’s general circuit idea notebook

- B.
An advertisement for an electrical device

- C.
The service/repair manual for a radio receiver

- D.
A procedural flowchart

- 3.Given a dc voltage source delivering 24 V and a circuit resistance of 3.3 KΩ, what is the current?
- A.
0.73 A

- B.
138 A

- C.
138 mA

- D.
7.3 mA

- 4.Suppose that a circuit has 472 Ω of resistance and the current is 875 mA. Then the source voltage is:
- A.
413 V

- B.
0.539 V

- C.
1.85 V

- D.
None of the above

- 5.The dc voltage in a circuit is 550 mV and the current is 7.2 mA. Then the resistance is:
- A.
0.76 Ω

- B.
76 Ω

- C.
0.0040 Ω

- D.
None of the above

- 6.Given a dc voltage source of 3.5 kV and a circuit resistance of 220 Ω, what is the current?
- A.
16 mA

- B.
6.3 mA

- C.
6.3 A

- D.
None of the above

- 7.A source delivers 12 V and the current is 777 mA. Then the best expression for the resistance is:
- A.
15 Ω

- B.
15.4 Ω

- C.
9.3 Ω

- D.
9.32 Ω

- 8.A circuit has a total resistance of 473,332 Ω and draws 4.4 mA. The best expression for the voltage of the source is:
- A.
2082 V

- B.
110 kV

- C.
2.1 kV

- D.
2.08266 kV

- 9.The voltage is 250 V and the current is 8.0 mA. The power dissipated by the potentiometer is:
- A.
31 mW

- B.
31 W

- C.
2.0 W

- D.
2.0 mW

- 10.The voltage from the source is 12 V and the potentiometer is set for 470 Ω. The power is about:
- A.
310 mW

- B.
25.5 mW

- C.
39.2 W

- D.
3.26 W

- 11.The current through the potentiometer is 17 mA and its value is 1.22KΩ. The power is:
- A.
0.24 μW

- B.
20.7 W

- C.
20.7 mW

- D.
350 mW

- 12.Suppose six resistors are hooked up in series, and each of them has a value of 540 Ω. Then the total resistance is:
- A.
90 Ω

- B.
3.24 KΩ

- C.
540 Ω

- D.
None of the above

- 13.Four resistors are connected in series, each with a value of 4.0 KΩ. The total resistance is:
- A.
1 KΩ

- B.
4 KΩ

- C.
8 KΩ

- D.
16 KΩ

- 14.Suppose you have three resistors in parallel, each with a value of 68,000 Ω. Then the total resistance is:
- A.
23 Ω

- B.
23 KΩ

- C.
204 Ω

- D.
0.2 MΩ

- 15.There are three resistors in parallel, with values of 22 Ω, 27Ω, and 33 Ω. A 12-V battery is connected across this combination, as shown in Fig. 4-11. What is the current drawn from the battery by this resistance combination?
- A.
1.3 A

- B.
15 mA

- C.
150 mA

- D.
1.5 A

- 16.Three resistors, with values of 47 Ω, 68 Ω, and 82 Ω, are connected in series with a 50-V dc generator, as shown in Fig. 4-12. The total power consumed by this network of resistors is:
- A.
250 mW

- B.
13 mW

- C.
13 W

- D.
Not determinable from the data given

- 17.You have an unlimited supply of 1-W, 100-Ω resistors. You need to get a 100- Ω, 10-W resistor. This can be done most cheaply by means of a series-parallel matrix of
- A.
3 X 3 resistors

- B.
4 X 3 resistors

- C.
4 X 4 resistors

- D.
2 X 5 resistors

- 18.
- A.
Four sets of two 1000-Ω resistors in series, and connecting these four sets in parallel

- B.
Four sets of two 1000-Ω resistors in parallel, and connecting these four sets in series

- C.
A 3 X 3 series-parallel matrix of 1000-Ω resistors

- D.
Something other than any of the above

- 19.You have an unlimited supply of 1-W, 1000-Ω resistors, and you need to get a 3000-Ω, 5-W resistance. The best way is to:
- A.
Make a 2 X 2 series-parallel matrix

- B.
Connect three of the resistors in parallel

- C.
Make a 3 X 3 series-parallel matrix

- D.
Do something other than any of the above

- 20.Good engineering practice usually requires that a series-parallel resistive network be made:
- A.
From resistors that are all very rugged

- B.
From resistors that are all the same

- C.
From a series combination of resistors in parallel

- D.
From a parallel combination of resistors in series