**Basic Electrical Special MCQ Part Two**

**1.A positive electric pole**

- Has a deficiency of electrons.
- Has fewer electrons than the negative pole.
- Has an excess of electrons.
- Has more electrons than the negative pole

**Answer-2**

**2.An EMF of one volt**

- Cannot drive much current through a circuit.
- Represents a low resistance.
- Can sometimes produce a large current.
- Drops to zero in a short time.

**Answer-3**

**3.A potentially lethal electric current is on the order of**

- 0.01 mA.
- 0.1 mA.
- 1 mA.
- 0.1 A.

**Answer-4**

**4.A current of 25 A is most likely drawn by**

- A flashlight bulb.
- A typical household.
- A power plant.
- A clock radio.

**Answer-2**

**5.Which of these can represent magnetomotive force?**

- The volt-turn.
- The ampere-turn.
- The gauss.
- The gauss-turn.

**Answer-2**

**6.Which of the following units can represent magnetic flux density?**

- The volt-turn.
- The ampere-turn.
- The gauss.
- The gauss-turn.

**Answer-3**

**7.A ferromagnetic material**

- Concentrates magnetic flux lines within itself.
- Increases the total magneto motive force around a current-carrying wire.
- Causes an increase in the current in a wire.
- Increases the number of ampere-turns in a wire.

**Answer-1**

**8.A coil has 500 turns and carries 75 mA of current.The magneto motive force will be**

- 37,500 At.
- 375 At.
- 37.5 At.
- 3.75 At.

**Answer-3**

**9.A piece of wire has a conductance of 20 siemens. Its resistance is**

- 20 Ω.
- 0.5 Ω.
- 0.05 Ω.
- 0.02 Ω.

**Answer-3**

**10.A resistor has a value of 300 ohms. Its conductance is**

**3.33 millisiemens.**- 33.3 millisiemens.
- 333 microsiemens.
- 0.333 siemens.

**Answer-4**

**11.A mile of wire has a conductance of 0.6 siemens. Then three miles of the same wire has a conductance of**

- 1.8 siemens.
- 1.8 Ω.
- 0.2 siemens.
- Not enough information has been given to answer this.

**Answer-3**

**12.A 2-kW generator will deliver approximately how much current, reliably, at 117 V?**

- 17 mA.
- 234 mA.
- 17 A.
- 234 A.

**Answer-3**

**13.A circuit breaker is rated for 15 A at 117 V. This represents approximately how many kilowatts?**

- 1.76.
- 1760.
- 7.8.
- 0.0078.

**Answer-1**

**14.You are told that a certain air conditioner is rated at 500 Btu. What is this in kWh?**

- 147.
- 14.7.
- 1.47.
- 0.147.

**Answer-4**

**15.Of the following energy units, the one most often used to define electrical energy is**

- The Btu.
- The erg.
- The foot pound.
- The kilowatt hour.

**Answer-4**

**16.The frequency of common household ac in the U.S. is**

- 60 Hz.
- 120 Hz.
- 50 Hz.
- 100 Hz.

**Answer-1**

**17.Half-wave rectification means that**

- Half of the ac wave is inverted.
- Half of the ac wave is chopped off.
- The whole wave is inverted.
- The effective value is half the peak value.

**Answer-2**

**18.In the output of a half-wave rectifier**

- Half of the wave is inverted.
- The effective value is less than that of the original ac wave.
- The effective value is the same as that of the original ac wave.
- The effective value is more than that of the original ac wave.

**Answer-2**

**19.In the output of a full-wave rectifier**

- The whole wave is inverted.
- The effective value is less than that of the original ac wave.
- The effective value is the same as that of the original ac wave.
- The effective value is more than that of the original ac wave.

**Answer-3**

**20.A low voltage, such as 12 V**

- Is never dangerous.
- Is always dangerous.
- Is dangerous if it is ac, but not if it is dc.
- Can be dangerous under certain conditions

**Answer-4**