What is the primary function of an industrial relay in a control circuit?
RME Review - Control Equipment

Quiz
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Engineering
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Professional Development
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Medium
Celestino Cole
Used 2+ times
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25 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
To supply power to the motor directly
To measure the current in the circuit
To protect the circuit from overload
To isolate and control the operation of high-power circuits using a low-power signal
Answer explanation
The primary function of an industrial relay is to isolate and control high-power circuits using a low-power signal, allowing safe operation without direct electrical connection to the high-power components.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
How does the coil in an industrial relay function?
It generates a magnetic field to open or close the relay contacts
It provides overload protection to the relay
It converts AC voltage to DC voltage
It acts as the main switch in the circuit
Answer explanation
The coil in an industrial relay generates a magnetic field when energized, which opens or closes the relay contacts, allowing or interrupting the flow of electricity in the circuit.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the primary function of a circuit breaker?
To measure the current in a circuit
To protect the circuit against overcurrent
To protect the circuit against short circuit
To protect electrical circuits from both overcurrent and short circuits
Answer explanation
The primary function of a circuit breaker is to protect electrical circuits from both overcurrent and short circuits, ensuring safety by interrupting the flow of electricity when these conditions occur.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which type of circuit breaker is commonly used for control circuit?
miniature circuit breaker
air circuit breaker
oilt type circuit breaker
SF6 circuit breaker
Answer explanation
The miniature circuit breaker (MCB) is commonly used for control circuits due to its compact size and ability to protect against overloads and short circuits, making it ideal for low voltage applications.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What happens to the fuse element when the current exceeds the fuse's rated capacity?
It increases the circuit's resistance
It melts and breaks the circuit
It allows more current to pass through
It reduces the voltage in the circuit
Answer explanation
When the current exceeds the fuse's rated capacity, the fuse element melts due to overheating, breaking the circuit. This prevents further current flow, protecting the electrical system from damage.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Why is a circuit breaker preferred over a fuse in motor control circuits?
Circuit breakers are cheaper than fuses.
Circuit breakers can be reset after tripping, while fuses need replacement.
Circuit breakers are smaller in size than fuses.
Circuit breakers reduce the motor's starting current.
Answer explanation
Circuit breakers are preferred in motor control circuits because they can be reset after tripping, unlike fuses which must be replaced. This feature allows for quicker recovery and less downtime in operations.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In a motor control circuit, what happens if the fuse used is rated lower than the motor's operating current?
The motor will run at a reduced speed.
The fuse will blow frequently during normal operation
The motor will not start.
The fuse will act as an overload relay.
Answer explanation
If the fuse is rated lower than the motor's operating current, it cannot handle the normal current draw, causing it to blow frequently during operation. This interrupts the circuit and prevents the motor from running properly.
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