Circuit Breaker – Definition
Circuit Breaker is a safety device used to protect the circuit/appliances from the overload voltage/current. It works like a switch whenever the normal supply is coming then it allows to pass but in the abnormal condition it does not allow to pass the voltage or supply. It works like an automatic switch which principle is to trip the supply. Most common use of circuit breaker is inside out houses.
- Introduction to Circuit Breaker
- Principle of Circuit Breaker
- Types of Circuit Breaker
- What is Relay and Timers
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The aim is to provide MCQs on circuit breaker in Electronics objective questions and answers to understand the concepts of safety/protection techniques. If you are willing to learn the concepts of Basic Electronics MCQs multiple choice questions with answer then read all the questions and answers. You will be surely able to qualify for all kinds of Quiz / tests / Interviews after understanding the Introduction to Circuit Breaker. If you are a students, technician or teacher then you can learn the basic concept of circuit breaker principle, function and applications.
MCQs on Circuit Breaker (Questions and Answers)
Q1. The device used for operating the electrical devices is______________.
- circuit breaker
- switch
- transformer
- all are correct
Answer: a
Q2. The pulse for operating the circuit breaker is come from Relay. True / False
Answer: True
Q3. In oil circuit breaker, the oil is used for _______________.
- cooling
- quenching
- insulation
- All are correct
Answer: d
Q4. Circuit breaker is a device used On and Off operation during normal and abnormal condition. True / False
Answer: True
Q5. In bulk oil circuit breaker the quantity of oil is _______________.
- high
- zero
- low
- a & b are correct
Answer: a
Q6. The resistance of motor starter is connected in series with armature. True / False
Answer: True
Q7. In low oil circuit breaker the quantity of oil is ____________.
- low
- high
- zero
- all are incorrect
Answer: a
Q8. The motor stator works to decreases starting current. True / False
Answer: True
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Q9. By decreasing the value of motor starter resistance, the back E.M.F of motor _______________.
- same
- increases
- decreases
- none is correct
Answer: b
Q10. By decreasing the value of motor starter resistance, the speed of motor is increased . True / False
Answer: True
Q11. In the stop (resting) condition of motor, the back E.M.F is _____________.
- infinity
- low
- high
- zero
Answer: d
Q12. The thermal relay operate as overload and short circuit conditions. True / False
Answer: True
Q13. Relay is a _____________ device.
- manual
- automatic
- a & b are correct
Answer: b
Q14. The thermal relay works on Heating effect. True / False
Answer: True
Q15. A bimetal thermal relay consists of ___________.
- one strip
- two strip
- three strip
- four strip
Answer: b
Q16. The difference between bimetal strip and Relay strip is thermal conductivity. True / False
Answer: True
Q17. Induction Relay is used on ____________ supply.
- AC
- DC
- Three Phase
- All are correct
Answer: a
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Q18. Thermal relay works as a result of thermal effect of current. True / False
Answer: True
Q19. How many types of DC Motor startor ?
- 1
- 3
- 2
- 4
Answer: b
Q20. Timers are numerical, mechanical and electronics. True / False
Answer: True
