Gibilisco:Chapter 2 - Electrical Units
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This is the MCQs for Gibilisco:CHAPTER 2 - ELECTRICAL UNITS
- 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
Questions: 25 | Attempts: 11540 | Last updated: Dec 29, 2020
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