Switchgear & Protection Test Question(Electrical Engineering Questions ) Questions and Answers

Question 1. What is the primary principle of a fuse?
  1.    Open the circuit.
  2.    Protect the appliance.
  3.    Protect the line.
  4.    Prevent excess current from flowing into the line.
Explanation:-
Answer: Option D. -> Prevent excess current from flowing into the line.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. What is switchgear?
  1.    An apparatus used for switching, controlling and protecting the electrical circuits and equipments.
  2.    It detects the faults only.
  3.    It corrects the faults only.
  4.    All of the above.
Explanation:-
Answer: Option D. -> All of the above.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. When does the circuit breaker operate in the line?
  1.    When power is to be supplied.
  2.    When the line is to be tested.
  3.    Whenever the fault occurs in the line.
  4.    Whenever the switch and the relay has to be operated.
Explanation:-
Answer: Option C. -> Whenever the fault occurs in the line.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. Which material is used for the manufacture of bus bars?
  1.    Aluminium rods.
  2.    Copper rods.
  3.    Any conducting material.
  4.    Made of silver.
Explanation:-
Answer: Option B. -> Copper rods.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. Which among these is the least expensive protection for over current in low voltage system?
  1.    Rewirable fuse.
  2.    Isolator
  3.    Circuit breaker.
  4.    Air breaker switch.
Explanation:-
Answer: Option A. -> Rewirable fuse.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. Which device sends the information to the circuit breaker to interrupt the circuit in case of fault?
  1.    Switch
  2.    Relay
  3.    Circuit breaker itself does this function.
  4.    Fuse
Explanation:-
Answer: Option B. -> Relay
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. How is the bus bars rated?
  1.    Current only.
  2.    Voltage only.
  3.    Current, voltage and frequency.
  4.    Current, voltage, frequency and short circuit current.
Explanation:-
Answer: Option D. -> Current, voltage, frequency and short circuit current.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. Which among these are the main characteristics of a fuse element?
  1.    Low melting point
  2.    High conductivity
  3.    Least deterioration due to oxidation
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. Which among the following statement is true related to fuse?
  1.    Greater the current smaller is the time taken by the fuse to blow out.
  2.    Greater the current greater is the time taken by the fuse to blow out.
  3.    The current is directly proportion to the blow out time of fuse.
  4.    Is dependent on the temperature and atmospheric conditions.
Explanation:-
Answer: Option A. -> Greater the current smaller is the time taken by the fuse to blow out.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. For a current upto 10A which material is used as the fusing element?
  1.    Copper
  2.    Silver
  3.    Alloy of lead and tin
  4.    Zinc
Explanation:-
Answer: Option C. -> Alloy of lead and tin
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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