RSES Electrical Systems & Controls — Questions and Answers
Question 1: What is the function of a contactor in a refrigeration system?
- Measure humidity
- Transfer refrigerant
- Control high-voltage circuits (Correct answer)
- Filter air
Correct answer: Control high-voltage circuits
It acts as a switch to control high-voltage components.
Question 2: What is the purpose of a capacitor in a motor circuit?
- Heat the coil
- Increase noise
- Boost motor performance (Correct answer)
- Dim the lights
Correct answer: Boost motor performance
To provide a starting or running boost for motors.
Question 3: Which device protects the system from electrical overload?
- Thermostat
- Pressure switch
- Fuse or breaker (Correct answer)
- Relay
Correct answer: Fuse or breaker
A fuse or circuit breaker cuts off current when it exceeds safe limits.
Question 4: Why is grounding important in electrical systems?
- Reduce noise
- Change voltage
- Prevent electrical shocks (Correct answer)
- Improve cooling
Correct answer: Prevent electrical shocks
To ensure user safety and prevent electrical shocks.
Question 5: What is the role of a thermostat?
- Moves air
- Adds moisture
- Regulates temperature (Correct answer)
- Closes ducts
Correct answer: Regulates temperature
It senses temperature and controls the system accordingly.
Question 6: How is a relay used in a control system?
- Cools the refrigerant
- Heats the air
- Switches circuits (Correct answer)
- Regulates pressure
Correct answer: Switches circuits
It opens or closes circuits based on control signals.
Question 7: Why use color-coded wiring?
- For decoration
- To confuse others
- To maintain safety and standards (Correct answer)
- To mark insulation type
Correct answer: To maintain safety and standards
To ensure correct and safe electrical connections.
Question 8: What tool measures voltage and current?
- Wrench
- Thermometer
- Multimeter (Correct answer)
- Caliper
Correct answer: Multimeter
A multimeter is used to test electrical circuits.
Question 9: Why must circuit diagrams be followed?
- To draw pictures
- To replace fuses
- Ensure proper wiring (Correct answer)
- Label refrigerant
Correct answer: Ensure proper wiring
They provide the correct wiring and operation layout.
RSES Electrical Systems & Controls
What is the function of a contactor in a refrigeration system?