Power Engineering Chapter 80
Showing posts with label Power Engineering Chapter 80. Show all posts
Showing posts with label Power Engineering Chapter 80. Show all posts

Batteries

Batteries



a) do not pose any immediate electrical hazards
b) produce a steady AC voltage
c) produce a varying DC voltage
d) produce a steady DC voltage
e) produce a varying AC voltage



Answer: D

When using an electrical meter to check that a circuit is safe to work on, it is important to verify the proper scale, current, or both that is being used because

When using an electrical meter to check that a circuit is safe to work on, it is important to verify the proper scale, current, or both that is being used because




a) it may appear that no voltage or current is present and therefore safe
b) the meter will be damaged
c) the user will be subjecting himself or herself to danger
d) the main high voltage transformer circuit will be opened
e) electrical wiring will be damaged by fire or overheating







Answer: A

A power meter

A power meter



a) reads the actual power consumed
b) does not require a multiplying factor
c) reads only a small percentage of the actual load
d) will calculate the actual cost of the power
e) does not take into account the system voltage





Answer: D

Whenever voltmeters are connected to a direct current the:

Whenever voltmeters are connected to a direct current the:




a. Positive lead must be connected to the positive point of the circuit
b. Positive lead must be connected to the negative point in the circuit
c. Positive lead must be connected to the neutral point in the circuit
d. Negative lead must be disconnected from the circuit
e. Positive lead must be disconnected from the circuit






Answer: A

A kilowatt-hour meter has a small motor which:

A kilowatt-hour meter has a small motor which:



a. Turns at a constant speed
b. Slows down as power consumption increases
c. Has a speed proportional to power consumption
d. Indicates the multiplier to be used when reading the meter
e. Moves the meter demand pointer






Answer: C

Clamp-on ammeter readings may be inaccurate if:

Clamp-on ammeter readings may be inaccurate if:



a. Jaws are dirty or misaligned
b. Circuit voltage is too high
c. Circuit resistance is too low
d. Circuit power is too high
e. Conductor insulation is too thick





Answer: A

Ammeters are connected:

Ammeters are connected:



a. In parallel with the circuit
b. In series with the circuit
c. In parallel with the circuit to measure the resistance
d. So that voltage will bypass the meter
e. To the negative and positive terminals of the battery





Answer: B

When reading the dials of a power meter, read:

When reading the dials of a power meter, read:



a. Them in the sequence shown by the letters under each
b. Them from left to right
c. The ones that rotate clockwise first
d. Them from right to left
e. Them only at the request of the utility company







Answer: D

An Ammeter must _____ to the electrical circuit.

An Ammeter must _____ to the electrical circuit.



a. offer low resistance
b. offer no resistance
c. offer a slight resistance
d. offer a high resistance
e. apply a voltage






Answer: A

The black demand pointer of a power meter:

The black demand pointer of a power meter:



a. Moves the red pointer
b. Reads the current demand
c. Resets automatically
d. Indicates the maximum voltage being drawn
e. Must be manually reset





Answer: E

A voltmeter must ______________ electrical circuit.

A voltmeter must ______________ electrical circuit.



a. Offer low resistance to the
b. Offer no resistance to the
c. Offer slight resistance to the
d. Offer high resistance to the
e. Interfere with the





Answer: D
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