DC Thermal Relay

How does the DC thermal relay operate?

• a. Using electromagnetic attraction
• b. Using thermal energy
• c. Using electrical energy
• d. Using chemical reactions

Which of the following is a disadvantage of using a DC thermal relay?

• a. They are expensive
• b. They require regular maintenance
• c. They are not reliable in extreme temperatures
• d. They have a short lifespan

What is the main application of DC thermal relays?

• a. In low voltage circuits
• b. In high voltage circuits
• c. In power transformers
• d. In electric motors

Which of the following is a common type of DC thermal relay?

• a. Type M
• b. Type K
• c. Type B
• d. Type R

How does the reset button of a DC thermal relay work?

• a. It switches off the power supply to the relay
• b. It resets the thermal element
• c. It activates the magnetic coil
• d. It changes the contact position

What is the primary function of a DC thermal relay?

• a. To protect electrical equipment from overload
• b. To provide voltage regulation
• c. To prevent electrical fires
• d. To maintain power factor

What is the thermal element made of in a DC thermal relay?

• a. Copper
• b. Aluminum
• c. Iron
• d. Nichrome

Which of the following factors affects the operation of a DC thermal relay?

• a. Ambient temperature
• b. Humidity
• c. Voltage level
• d. Frequency

What is the time delay in a DC thermal relay?

• a. The time it takes for the thermal element to heat up
• b. The time it takes for the magnetic coil to activate
• c. The time it takes for the contacts to change position
• d. The time it takes for the reset button to work