Trinity Bay Student's Midterm Practice Test
Quiz by Telesto
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- Q1
Which of the following is a type of raceway used for protecting electrical wiring?
Wire duct
Conduit
Cable tray
All of the above
60s - Q2
What does UPS stand for?
Uninterruptible Power Supply
Unified Power Source
Uninterrupted Power Supply
Universal Power System
60s - Q3
UPS stands for Uninterruptible Power Supply, which provides _________________ during power outages.
surge protection
backup power
electricity
voltage regulation
60s - Q4
Which function does an MCC (Motor Control Center) primarily facilitate within an industrial environment?
Managing and regulating motor operations
Safeguarding against power surges
Coordinating communication between departments
Monitoring and controlling environmental conditions
60s - Q5
Power factor is the ratio of _________________ to apparent power.
real power
subtractive power
apparent power
reactive power
60s - Q6
What power factor value is typically considered desirable in electrical systems?
0.85
0.8
0.75
0.95
60s - Q7
What is the function of a Variable Frequency Drive (VFD) or Variable Speed Drive (VSD) in electrical systems?
To vary the frequency and voltage supplied to the motor to control its speed and torque
To divert excess voltage surges to ground
To monitor the frequency of the electrical signal
To regulate voltage fluctuations in the power supply
60s - Q8
What is the fundamental power frequency commonly used in the United States electrical grid?
50 kHz
60 Hz
60 kHz
50 Hz
60s - Q9
What do harmonic frequencies refer to in electrical systems?
Frequencies generated by wind turbines
Frequencies that are multiples of the fundamental frequency and cause distortion in the waveform
Frequencies used for power transmission
Frequencies measured in AC circuits
60s - Q10
Which of the following raceway systems is commonly used for both flexible and rigid applications, providing durability and protection for electrical wiring?
PVC conduit
Flexible metal conduit
Galvanized steel conduit
60s - Q11
What does RPM stand for and what does it measure?
Revolutions Per Millisecond, measures the speed of electrical current
Revolutions Per Minute, measures the rotational speed of a mechanical component
Rotations Per Megabyte, measures the data transfer speed in a computer Answer: c) Revolutions Per Minute, measures the rotational speed of a mechanical component
Rotations Per Millimeter, measures the distance between electrical components
30s - Q12
A ground fault occurs when:
A live wire comes in contact with the ground or an unintended path
Current flows through the intended path
The circuit is properly grounded
None of the above
60s - Q13
What happens in a short circuit?
The circuit becomes grounded
Excessive current flows through a low-resistance path
Voltage drops to zero
None of the above
60s - Q14
What is the primary function of a GFCI (Ground Fault Circuit Interrupter) outlet?
To protect against overload
To protect against short circuits
To prevent ground faults
None of the above
60s - Q15
Which ground testing method involves driving four equally spaced electrodes into the ground?
Ground Clamp
3-point Fall of Potential
Wenner 4-point
Wenner 3-point
60s