In this, a total of 20 objective type questions are given. Which is important for ITI cbt exam as well as all other competitive exams like SSC, JE, JVVNL Technical Helper, DRDO, Metro, RRB, UPPCL etc.
Transformer MCQ Questions And Answers Set -03 (1-10)
1. The purpose of providing an iron core in a transformer
(A) provide support to windings
(B) Reduce Hysteresis Loss
(C) reduces the reluctance of the magnetic path
(D) Reduce Eddy Current Loss
Ans :- (C)
2. Which of the following is not a part of Transformer Installation?
(A) Conservator
(B) Breather
(C) Buchholz relay
(D) Exciter
Ans :- (D)
3. The routine efficiency of a transformer depends on
(A) supply frequency
(B) Load current
(C) Power factor of load
(D) Both (B) and (C)
Ans :- (D)
4. What is the function of a conservator in a transformer
(A) Providing fresh air for cooling the transformer
(B) Supply of cooling oil to the transformer at the time of need
(C) When the oil expends due to heating, protect the transformer from damage
(D) None of the above
Ans :- (C)
5. Natural oil cooling is used for transformers up to rating
(A) 3000 KVA
(B) 1000 kVA
(C) 500 kVA
(D) 250 kVA
Ans :- (A)
6. Power transformer is designed for maximum efficiency
(A) almost full load
(B) 70% full load
(C) 50% full load
(D) No weight
Ans :- (A)
7. The maximum efficiency of a distribution transformer is
(A) without any load
(B) 50% at full load
(C) 80% at full load
(D) at full weight
Ans :- (B)
8. When conducting a short-circuit test on a transformer, which side is short-circuited
(A) high voltage side
(B) low voltage side
(C) Primary party
(D) Secondary side
Ans :- (B)
9. Which winding has more cross section area in the transformer
(A) low voltage winding
(B) High voltage winding
(C) Primary Winding
(D) Secondary Winding
Ans :- (A)
10. A transformer transfers
(A) voltage
(B) present
(C) power
(D) frequency
Ans :- (C)
Transformer MCQ Questions And Answers Set -03 (11-20)
11. A transformer cannot reduce or exceed the DC supply voltage because
(A) There is no need to change the D.C. voltage
(B) A DC circuit has more losses
(C) Faraday's laws of electromagnetic induction are not valid because the rate of change of flux is zero in dc supply
(D) None of the above
Ans :- (C)
12. Secondary leakage flux occurs
(A) Less Secondary induced EMF
(B) Low primary induced EMF
(C) will be low primary terminal voltage
(D) None of the above
Ans :- (A)
13. The purpose of providing iron core in step-up transformers is
(A) To provide coupling between primary and secondary
(B) To increase the magnitude of mutual flux
(C) To reduce the magnitude of magnetizing current
(D) To provide all the above features
Ans :- (C)
14. Power transformer is a constant
(A) voltage device
(B) current device
(C) Power device
(D) Main Flux Device
Ans :- (D)
15. Two transformers working in parallel will share load on the basis of which factor
(A) leakage Reactance
(B) impedance per unit
(C) efficiency
(D) ratings
Ans :- (B)
16. Which of the following does not change in the transformer?
(A) current
(B) voltage
(C) Frequency
(D) ALL OF THE ABOVE
Ans :- (C)
17. A transformer carries energy from primary to secondary
(A) through the cooling coil
(B) through the air
(C) by flux
(D) None of the above
Ans :- (C)
18. A transformer core is in lamination
(A) reduces hysteresis loss
(B) reduces eddy current loss
(C) reduces copper loss
(D) reduces all of the above losses
Ans :- (B)
19. The degree of mechanical vibration produced by lamination of a transformer depends on
(A) clamping tightness
(B) Lamination gauge
(C) Lamination size
(D) ALL OF THE ABOVE
Ans :- (D)
20. The no-load current taken by the transformer is usually what percent of the full-load current?
(A) 0.2 to 0.5 percent
(B) 2 to 5 percent
(C) 12 to 15 percent
(D) 20 to 30 percent
Ans :- (B)