Gibilisco:Chapter 2 - Electrical Units

20 Questions | By Froydwess | Last updated: Mar 22, 2022 | Total Attempts: 797

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Gibilisco:Chapter 2 - Electrical Units - Quiz

This is the MCQs for Gibilisco:CHAPTER 2 - ELECTRICAL UNITS

Questions and Answers

1.

A positive electric pole:
- A.
  
  Has a deficiency of electrons.
- B.
  
  Has fewer electrons than the negative pole.
- C.
  
  Has an excess of electrons.
- D.
  
  Has more electrons than the negative pole
2.

An EMF of one volt:
- A.
  
  Cannot drive much current through a circuit.
- B.
  
  Represents a low resistance.
- C.
  
  Can sometimes produce a large current.
- D.
  
  Drops to zero in a short time.
3.

A potentially lethal electric current is on the order of:
- A.
  
  0.01 mA.
- B.
  
  0.1 mA.
- C.
  
  1 mA.
- D.
  
  0.1 A.
4.

A current of 25 A is most likely drawn by:
- A.
  
  A flashlight bulb.
- B.
  
  A typical household.
- C.
  
  A power plant.
- D.
  
  A clock radio.
5.

A piece of wire has a conductance of 20 siemens. Its resistance is:
- A.
  
  20 Ω.
- B.
  
  0.5 Ω.
- C.
  
  0.05 Ω.
- D.
  
  0.02 Ω.
6.

A resistor has a value of 300 ohms. Its conductance is:
- A.
  
  3.33 millisiemens.
- B.
  
  33.3 millisiemens.
- C.
  
  333 microsiemens.
- D.
  
  0.333 siemens.
7.

A mile of wire has a conductance of 0.6 siemens. Then three miles of the same wire has a conductance of:
- A.
  
  1.8 siemens.
- B.
  
  1.8 Ω.
- C.
  
  0.2 siemens.
- D.
  
  Not enough information has been given to answer this.
8.

A 2-kW generator will deliver approximately how much current, reliably, at 117 V?
- A.
  
  17 mA.
- B.
  
  234 mA.
- C.
  
  17 A.
- D.
  
  234 A.
9.

A circuit breaker is rated for 15 A at 117 V. This represents approximately how many kilowatts?
- A.
  
  1.76
- B.
  
  1760
- C.
  
  7.8
- D.
  
  0.0078
10.

You are told that a certain air conditioner is rated at 500 Btu. What is this in kWh?
- A.
  
  147
- B.
  
  14.7
- C.
  
  1.47
- D.
  
  0.147
11.

Of the following energy units, the one most often used to define electrical energy is:
- A.
  
  The Btu
- B.
  
  The erg
- C.
  
  The foot pound
- D.
  
  The kilowatt hour
12.

The frequency of common household ac in the U.S. is:
- A.
  
  60 Hz
- B.
  
  120 Hz
- C.
  
  50 Hz
- D.
  
  100 Hz
13.

Half-wave rectification means that:
- A.
  
  Half of the ac wave is inverted
- B.
  
  Half of the ac wave is chopped off
- C.
  
  The whole wave is inverted
- D.
  
  The effective value is half the peak value
14.

In the output of a half-wave rectifier:
- A.
  
  Half of the wave is inverted
- B.
  
  The effective value is less than that of the original ac wave
- C.
  
  The effective value is the same as that of the original ac wave
- D.
  
  The effective value is more than that of the original ac wave
15.

In the output of a full-wave rectifier:
- A.
  
  The whole wave is inverted
- B.
  
  The effective value is less than that of the original ac wave
- C.
  
  The effective value is the same as that of the original ac wave
- D.
  
  The effective value is more than that of the original ac wave
16.

A low voltage, such as 12 V:
- A.
  
  Is never dangerous
- B.
  
  Is always dangerous
- C.
  
  Is dangerous if it is ac, but not if it is dc
- D.
  
  Can be dangerous under certain conditions
17.

Which of these can represent magnetomotive force?
- A.
  
  The volt-turn
- B.
  
  The ampere-turn
- C.
  
  The gauss
- D.
  
  The gauss-turn
18.

Which of the following units can represent magnetic flux density?
- A.
  
  The volt-turn
- B.
  
  The ampere-turn
- C.
  
  The gauss
- D.
  
  The gauss-turn
19.

A ferromagnetic material:
- A.
  
  Concentrates magnetic flux lines within itself
- B.
  
  Increases the total magnetomotive force around a current-carrying wire
- C.
  
  Causes an increase in the current in a wire
- D.
  
  Increases the number of ampere-turns in a wire
20.

A coil has 500 turns and carries 75 mA of current. The magnetomotive force will be:
- A.
  
  37,500 At
- B.
  
  375 At
- C.
  
  37.5 At
- D.
  
  3.75 At