4th class Part A Unit 8 Exam 2025
Questions and Answers
A UPS is compromised of a battery bank, __________, an inverter and a transfer switch - Correct
Answer✔️✔️-receiver
Determine the speed of a synchronous motor operating with a line frequency of 60 Hz where the
motor has 4 poles - Correct Answer✔️✔️-1800 rpm
A moving conductor is at an angle of 90 degrees within the magnetic field - Correct Answer✔️✔️-
voltage generated will be at its maximum
A___________ breaker is used to maintain power, to a switch board main bus, via an alternate
power supply - Correct Answer✔️✔️-tie
In all circuits live conductors are protected by - Correct Answer✔️✔️-fuses and circuit breakers
When synchronizing a generator; voltage and frequency must all be the same as well as - Correct
Answer✔️✔️-phase sequence
A power factor higher than__________ is generally not required as there is no beneficial savings by
adding the cost of the extra capacitors - Correct Answer✔️✔️-0.95
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, The applied voltage in a circuit is 120 volts and the current flow is 3 amperes. Calculate the
resistance - Correct Answer✔️✔️-40 ohms
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 - Correct Answer✔️✔️-it may appear that
no voltage or current is present and therefore safe
The field rheostat changes the _____________ in a DC generator - Correct Answer✔️✔️-output
voltage
The total number of lines of force in a magnetic field determines - Correct Answer✔️✔️-the
magnitude of the magnetic flux
The connection provided on DC motors to supply the armature with power - Correct
Answer✔️✔️-commutator
According to ANSI, what is the oils maximum operating temperature of a transformer - Correct
Answer✔️✔️-90 C
The electrical unit of power is the - Correct Answer✔️✔️-watt
Current flow is inversely proportional to the - Correct Answer✔️✔️-resistance
Three resistors of 300 ohms, 1 ohm and 420 ohms are connected in series. Determine the total
equivalent resistance - Correct Answer✔️✔️-721 ohms
A potential of 320 volts is applied to a resistor of 80 ohms resistance. Determine the current flow -
Correct Answer✔️✔️-4 amps
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
Questions and Answers
A UPS is compromised of a battery bank, __________, an inverter and a transfer switch - Correct
Answer✔️✔️-receiver
Determine the speed of a synchronous motor operating with a line frequency of 60 Hz where the
motor has 4 poles - Correct Answer✔️✔️-1800 rpm
A moving conductor is at an angle of 90 degrees within the magnetic field - Correct Answer✔️✔️-
voltage generated will be at its maximum
A___________ breaker is used to maintain power, to a switch board main bus, via an alternate
power supply - Correct Answer✔️✔️-tie
In all circuits live conductors are protected by - Correct Answer✔️✔️-fuses and circuit breakers
When synchronizing a generator; voltage and frequency must all be the same as well as - Correct
Answer✔️✔️-phase sequence
A power factor higher than__________ is generally not required as there is no beneficial savings by
adding the cost of the extra capacitors - Correct Answer✔️✔️-0.95
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, The applied voltage in a circuit is 120 volts and the current flow is 3 amperes. Calculate the
resistance - Correct Answer✔️✔️-40 ohms
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 - Correct Answer✔️✔️-it may appear that
no voltage or current is present and therefore safe
The field rheostat changes the _____________ in a DC generator - Correct Answer✔️✔️-output
voltage
The total number of lines of force in a magnetic field determines - Correct Answer✔️✔️-the
magnitude of the magnetic flux
The connection provided on DC motors to supply the armature with power - Correct
Answer✔️✔️-commutator
According to ANSI, what is the oils maximum operating temperature of a transformer - Correct
Answer✔️✔️-90 C
The electrical unit of power is the - Correct Answer✔️✔️-watt
Current flow is inversely proportional to the - Correct Answer✔️✔️-resistance
Three resistors of 300 ohms, 1 ohm and 420 ohms are connected in series. Determine the total
equivalent resistance - Correct Answer✔️✔️-721 ohms
A potential of 320 volts is applied to a resistor of 80 ohms resistance. Determine the current flow -
Correct Answer✔️✔️-4 amps
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
