Electrical 5
Electrical Safety and Circuit Knowledge Quiz
Test your understanding of electrical systems and safety protocols with our comprehensive quiz. This engaging exercise covers vital topics such as circuit breakers, ground detection systems, and ungrounded electrical distribution. Perfect for students, teachers, or anyone interested in enhancing their electrical knowledge!
- 23 multiple choice questions
- Focus on electric safety and maintenance
- Suitable for all skill levels
The purpose of the trip element shown in the illustration (EL-0033) is
To sense the overload condition and cause the circuit breaker to trip or break the circuit
To put out any fires that erupt inside the circuit breaker
To allow a time delay before interrupting the circuit
To automatically reset the breaker when the overload condition has been corrected
The position of the operating lever shown in 'Y' of the illustraton (EL-0033) would be
The 'on' positon, meaning that the circuit is connected between the line & the load
The 'off' positon, meaning that the circuit is not connected between the line & the load
The 'tripped' positon, meaning that the circuit not connected between the line& the load
None of the above
The position of the operating lever shown in 'Z' of the illustraton (EL-0033) would be
The 'on' positon, meaning that the circuit is connected between the line & the load
The 'off' positon, meaning that the circuit is not connected between the line & the load
The 'tripped' positon, meaning that the circuit not connected between the line& the load
None of the above
To reset a breaker that has tripped, such as that in the illustration (ELO-0033),
You only need to push the operation lever back to the 'on' position
You only need to push the operation lever back to the 'off' position and then back to the 'on' postion
You need to replace the breaker
It will reset itself when the condition that caused the trip has corrected itself
If a tripped breaker such as in the illustration (EL-0033)will not reset from the 'tripped' positon, even when there is no load,
You only need to push the operation lever back to the 'on' position
You only need to push the operation lever back to the 'off' position and then back to the 'on' postion
You need to replace the breaker
It will reset itself when the condition that caused the trip has corrected itself
The purpose of the arc extinguisher (aka, arc quincher) shown in the illustration (EL-0033) is
To confine, divide, and extinguish the arc drawn between contacts each time the circuit breaker interrupts current
To put out any fires that erupt inside the circuit breaker
To allow a time delay before interrupting the circuit
To automatically reset the breaker when the overload condition has been corrected
The ground detection system, shown in the illustration EL-0009 for a low-voltage, three-phase system has a ground in line "A". Therefore, lamp "A" will burn
Dimly or be out, and lamps "B" and "C" will burn brightly
Normally, and lamps "B" and "C" will burn dimly or be out
Brightly, and lamps "B' and "C" will burn dimly or be out
Brightly, and lamps "B’ and "C" will burn normally
In the illustrated ground detection system with a ground on phase A (EL-0009), if the switch is opened
Lamp A will dim or go out depending on the severity of the ground
All three lamps will return to their normal brightness indicating that the bulbs are not burnt out
Lamps B and C will dim lamp A will be brighter
Lamp A will start flickering if the ground is in an AC induction motor
A ground detection system is shown in the illustration (EL-0009) for a three-phase ungrounded distribution system. Which of the following statements describes the conditions indicated if a full ground occurs in line "A"?
Lamp "A" will burn brightly and Lamps "B" and “C" will go out
Lamp "A" will burn brightly and Lamps "B" and "C" will burn dimly but not go out.
Lamp "A" will burn brightly and Lamps "B" and "C" will burn with normal intensity.
Lamp "A" will go out and Lamps "B" and "C" will burn brightly
A ground in an electrical circuit outside the engine room
Cannot be detected under normal conditions
Is of no consequence to engineering personnel
Is indicated at the branch circuit breaker panel
Is indicated by the ground detecting lamps on the main switchboard
Which of the following represents a characteristic of an ungrounded electrical distribution system?
Accidental contact between one line and ground does not cause an outage.
Double ground faults on different phases will not cause an outage.
Ground detection systems are unnecessary .
Accidental contact between one line and ground will always cause an outage.
If all three ground-detection lamps continue to burn at equal intensity after the test button is depressed and released, which of the listed conditions is indicated?
No grounds exist
All three phases are grounded
The test switch is faulty
The current transformers are shorted out
When insulation failure produces a low resistance current path between two conductors, the resulting condition is known as
An open
A short circuit
A ground
A surge
The greatest single cause of electrical failures is
The breakdown of insulation
Overcurrent
High inductance
Too frequent testing
A circuit with a blown fuse would be described as a/an
Short circuit
Open circuit
Bonded circuit
Grounded circuit
A ground can be defined as an electrical connection between the wiring of a motor and its _____
Shunt field
Circuit breaker
Metal framework
Interpole
Grounds occurring in electrical machinery as a result of insulation failure may result from ____
Deterioration through extended use
Excessive heat
Extended periods of vibration
All of the above
On a switchboard, if all three ground detection lamps remain burning at half intensity when the test button is depressed, which of the listed conditions is indicated?
No grounds exist.
All three phases are grounded
The test switch is grounded.
The current transformers are shorted.
A ground in an electrical circuit outside the engine room ______
Cannot be detected under normal conditions
Is of no consequence to engineering personnel
Is indicated at the branch circuit breaker panel
Is indicated by the ground detecting lamps on the main switchboard
Which of the following represents a characteristic of an ungrounded electrical distribution system?
Which of the following represents a characteristic of an ungrounded electrical distribution system? Accidental contact between one line and ground does not cause an outage.
Double ground faults on different phases will not cause an outage.
Ground detection systems are unnecessary.
Accidental contact between one line and ground will always cause an outage.
A current carrying conductor making an electrical contact with a wiring metal conduit is indicated by a
Low switchboard wattmeter reading
Reading of 1.0 on the power factor meter
High switchboard voltmeter reading
Totally darkened switchboard ground- detecting light
The ground indicating light on the main electrical switchboard is indicating a ground. The best procedure for locating the grounded circuit is to _______
Trace the circuit paths while looking for burned spots
Check circuit resistances with a megohmmeter connected between the grounded line and the distribution panel framework
Open the circuit breakers on the distribution panel, one at a time, until the lights no longer indicate a ground
Check all circuits for continuity
Multiple grounds have developed and were initialy indicated by the ground-detecting system as one ground. The FIRST step in locating the grounds is to
Examine the main bus bars for signs of overheating
Eliminate the individual circuits one by one until the ground detecting system no longer indicates any grounds
Change over generators
Check each circuit with a megohmmeter
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