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Electrical Engineering
5 followers study24x7 27 Sep 2024 10:28 AM study24x7 study24x7

A 120 Ω resistor must carry a maximum current of 25 mA. Its rating should be at least

A

4.8 W

B

150 mW

C

15 mW

D

480 mW

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Electrical Engineering
5 followers study24x7 27 Sep 2024 10:26 AM study24x7 study24x7

At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?

A

1.286 kWh

B

12.85 kWh

C

535 kWh

D

252 kWh

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Electrical Engineering
5 followers study24x7 27 Sep 2024 10:25 AM study24x7 study24x7

A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes?

A

938 Wh

B

0.938 Wh

C

56.25 Wh

D

5.6 Wh

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Electrical Engineering
5 followers study24x7 26 Sep 2024 09:58 AM study24x7 study24x7

A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is

A

0.58 Ah

B

2.1 Ah

C

21 Ah

D

58 Ah

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Electrical Engineering
5 followers study24x7 26 Sep 2024 09:57 AM study24x7 study24x7

A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is

A

8.57%

B

42.85%

C

4.28%

D

85.7%

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Electrical Engineering
5 followers study24x7 26 Sep 2024 09:56 AM study24x7 study24x7

A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?

A

20.16 kWh

B

201.6 kWh

C

2.01 kWh

D

8.4 kWh

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Electrical Engineering
5 followers study24x7 25 Sep 2024 10:35 AM study24x7 study24x7

In 0.025 W, there are

A

25 kW

B

0.00025 mW

C

2,500 µW

D

25 mW

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Electrical Engineering
5 followers study24x7 25 Sep 2024 10:34 AM study24x7 study24x7

When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is

A

overheated

B

shorted

C

open

D

reversed

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Electrical Engineering
5 followers study24x7 25 Sep 2024 10:34 AM study24x7 study24x7

A 33  half-watt resistor and a 330  half-watt resistor are connected across a 12 V source. Which one(s) will overheat?

A

33 Ω

B

330 Ω

C

both resistors

D

neither resistor

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Electrical Engineering
5 followers study24x7 24 Sep 2024 10:52 AM study24x7 study24x7

What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?

A

8.2 k

B

820

C

8.2

D

82 

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Electrical Engineering
5 followers study24x7 24 Sep 2024 10:51 AM study24x7 study24x7

What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing?

A

183 

B

18.3

C

66

D

6.6

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Electrical Engineering
5 followers study24x7 24 Sep 2024 10:48 AM study24x7 study24x7

A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.

A

40Ω

B

4Ω

C

2Ω

D

20Ω

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Electrical Engineering
5 followers study24x7 23 Sep 2024 10:37 AM study24x7 study24x7

Approximately how much current flows through a 3.3 MΩ resistor across a 30 V source?

A

9 µA

B

90 µA

C

900 µA

D

9000 µA

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Electrical Engineering
5 followers study24x7 23 Sep 2024 10:34 AM study24x7 study24x7

When 12 V are applied across a 68Ω  resistor, the current is

A

816 mA

B

17.6 mA

C

176 mA

D

8.16 mA

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Electrical Engineering
5 followers study24x7 23 Sep 2024 10:33 AM study24x7 study24x7

Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?

A

4 Ω

B

400 Ω

C

4 kΩ

D

4.4 Ω

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Electrical Engineering
5 followers study24x7 20 Sep 2024 11:24 AM study24x7 study24x7

Four amperes of current are measured through a 24Ω  resistor connected across a voltage source. How much voltage does the source produce?

A

960 V

B

9.6 V

C

96 V

D

8 V

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Electrical Engineering
5 followers study24x7 20 Sep 2024 11:23 AM study24x7 study24x7

A current of 200 µA through a 6.8 kΩ resistor produces a voltage drop of

A

34.4 V

B

340 V

C

13.6 V

D

1.36 V

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Electrical Engineering
5 followers study24x7 20 Sep 2024 11:11 AM study24x7 study24x7

How much current is produced by a voltage of 18 kV across a 15 k resistance?

A

1.2 A

B

12 A

C

120 mA

D

12 mA

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Electrical Engineering
5 followers study24x7 19 Sep 2024 11:38 AM study24x7 study24x7

How much resistance is needed to draw 17.6 mA from a 12 volt source?

A

212Ω

B

6.8 kΩ

C

68 Ω

D

680 Ω

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