DBATU Model MCQ – Protection & Switchgear Engineering Views: 137 [adinserter block="1"] Welcome to your Protection And Switchgear Engineering, dated October 30, 2024 1. When does the circuit breaker operate in the line?Deselect Answer When power is to be supplied. When the line is to be tested. Whenever the fault occurs in the line. Whenever the switch and the relay has to be operated. None 2. Which material is used for the manufacture of bus bars?Deselect Answer Aluminium rods. Copper rods. Any conducting material. Made of silver. None 3. Which among these are the main characteristics of a fuse element?Deselect Answer Low melting point High conductivity Least deterioration due to oxidation All of the above None 4. Which among these is the least expensive protection for over current in low voltage system?Deselect Answer Rewirable fuse. Isolator. Circuit breaker. Air breaker switch. None 5. What is the maximum current upto which fuses can be used?Deselect Answer 25 A 75 A 1 25 A 100 A None 6. Which among these tests are performed to check the nation or international standards?Deselect Answer Type test. Production tests. Site checks. All of the above. None 7. What is the cut off current in the fuse?Deselect Answer Maximum value actually reached. Rms value actually reached. Average value actually reached. None of the above None 8. Which type of tripping is generally preferred for the circuit breaker?Deselect Answer Manual Automatically Depending on the voltage level None of the above None 9. How is the initiation of electric arc at the instant of contact separation caused?Deselect Answer Thermionic emission of electrons. Field emission of electrons. Both (a) and (b) None of these. None 10. The heat produced at the contact point owing to flow of electric current is least affected by_____________________.Deselect Answer Temperature of the surrounding medium. Contact resistance. Magnitude of electric current flowing. Duration of flow of current. None Please fill in the comment box below. [adinserter block="1"]
