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TOP  Electrical Transformers MCQ 

 Electrical Engineering MCQ  41TO 60

 Multiple Choice Questions and Answers 

Latest Transformers Interview Questions and Answers List

42. The chemical used in breather for transformer should have the quality of
(a)     ionizing air
(b)     absorbing moisture
(c) cleansing the transformer oil
(d) cooling the transformer oil.
Ans: b

43. The chemical used in breather is
(a) asbestos fiber
(b) silica sand
(c) sodium chloride
(d) silica gel
Ans: d

44. An ideal transformer has infinite values of primary and secondary inductances. The statement is
(a) true
(b) false
Ans: b

45. The transformer ratings are usually expressed in terms of
(a) volts
(b) amperes
(c) kW
(d) kVA
Ans: d

46. The noise resulting from vibrations of laminations set by magnetic forces, is termed as
(a) magnetostrication
(b) boo
(c) hum
(d) zoom
Ans: c

47. Hysteresis loss in a transformer varies as CBmax = maximum flux density)
(a) Bmax
(b) Bmax1-6
(C) Bmax1-83
(d) B max
Ans: b

48. Material used for construction of transformer core is usually
(a) wood
(b) copper
(c) aluminium
(d) silicon steel
Ans: d

49. The thickness of laminations used in a transformer is usually
(a) 0.4 mm to 0.5 mm
(b) 4 mm to 5 mm
(c) 14 mm to 15 mm
(d) 25 mm to 40 mm
Ans: a

50. The function of conservator in a transformer is
(a) to project against'internal fault
(b) to reduce copper as well as core losses
(c) to cool the transformer oil
(d) to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings
Ans: d

51. The highest voltage for transmitting electrical power in India is
(a) 33 kV.
(6) 66 kV
(c) 132 kV
(d) 400 kV
Ans: d

52. In a transformer the resistance between its primary and secondary is
(a) zero
(b) 1 ohm
(c) 1000 ohms
(d) infinite
Ans: d

53. A transformer oil must be free from
(a) sludge
(b) odour
(c) gases
(d) moisture
Ans: d

54. A Buchholz relay can be installed on
(a) auto-transformers
(b) air-cooled transformers
(c) welding transformers
(d) oil cooled transformers
Ans: d

55. Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds
(a) 50°C
(b) 80°C
(c) 100°C
(d) 150°C
Ans: d

56. The main reason for generation of harmonics in a transformer could be
(a)     fluctuating load
(b)     poor insulation
(c) mechanical vibrations
(d) saturation of core
Ans: d

57. Distribution transformers are generally designed for maximum efficiency around
(a) 90% load
(b) zero load
(c) 25% load
(d) 50% load
Ans: d

58. Which of the following property is not necessarily desirable in the material for transformer core ?
(a)     Mechanical strength
(6)     Low hysteresis loss
(c) High thermal conductivity
(d) High permeability
Ans: c

59. Star/star transformers work satisfactorily when
(a) load is unbalanced only
(b) load is balanced only
(c) on balanced as well as unbalanced loads
(d) none of the above
Ans: b

60. Delta/star transformer works satisfactorily when
(a) load is balanced only
(b) load is unbalanced only
(c) on balanced as well as unbalanced loads
(d)     none of the above
Ans: c

MCQ on Transformer 21-40                                           MCQ on Transformer 61-80

Here You Can Also Read In Detail About 

1) Type of Losses in Transformer

2)  Basic Concept of Transformer

TOP  Electrical Transformers MCQ 

 Electrical Engineering MCQ 61 TO 80

 Multiple Choice Questions and Answers 

Latest Transformers Interview Questions and Answers List

62. The magnetising current of a transformer is usually small because it has
(a) small air gap
(b) large leakage flux
(c) laminated silicon steel core
(d) fewer rotating parts
Ans: a

63. Which of the following does not change in an ordinary transformer ?
(a)     Frequency
(b)     Voltage
(c) Current
(d) Any of the above
Ans: a

64. Which of the following properties is not necessarily desirable for the material for transformer core ?
(a) Low hysteresis loss
(b) High permeability
(c) High thermal conductivity
(d) Adequate mechanical strength
Ans: c

65. The leakage flux in a transformer depends upon
(a)     load current
(b)     load current and voltage
(c) load current, voltage and frequency
(d) load current, voltage, frequency and power factor
Ans: a

66. The path of the magnetic flux in transformer should have
(a) high reluctance
(b) low reactance
(c) high resistance
(d) low resistance
Ans: b

67. Noise level test in a transformer is a
(a)     special test
(b)     routine test
(c) type test
(d) none of the above
Ans: c

68. Which of the following is not a routine test on transformers ?
(a) Core insulation voltage test
(b) Impedance test
(c) Radio interference test
(d)     Polarity test
Ans: c

69. A transformer can have zero voltage regulation at
(a) leading power factor
(b) lagging power factor
(c) unity power factor
(d) zero power factor
Ans: a

70. Helical coils can be used on
(a)     low voltage side of high kVA transformers
(b)     high frequency transformers
(c) high voltage side of small capacity transformers
(d) high voltage side of high kVA rating transformers
Ans: a

71. Harmonics in transformer result in
(a) increased core losses
(b) increased I2R losses
(c) magnetic interference with communication circuits
(d) all of the above
Ans: d

72. The core used in high frequency transformer is usually
(a) copper core     
(b) cost iron core
(c) air core
(d) mild steel core
Ans: c

73. The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be
(a) 6400 W
(b) 1600 W
(c) 800 W
(d) 400 W
Ans: d

1.74.   The value of flux involved m the e.m.f. equation of a transformer is
(a)     average value
(b)     r.m.s. value
(c) maximum value
(d) instantaneous value
Ans: c

L.75. Silicon steel used in laminations mainly reduces
(a) hysteresis loss
(b) eddy current losses
(c) copper losses
(d) all of the above
Ans: a

76. Which winding of the transformer has less cross-sectional area ?
(a) Primary winding
(b) Secondary winding
(c) Low voltage winding
(d) High voltage winding
Ans: d

77. Power transformers are generally designed to have maximum efficiency around
(a) no-load
(b) half-load
(c) near full-load  
(d) 10% overload
Ans: c

.78. Which of the following is the main advantage of an auto-transformer over a two winding transformer ?
(a) Hysteresis losses are reduced
(b) Saving in winding material
(c) Copper losses are negligible
(d) Eddy losses are totally eliminated
Ans: b

79. During short circuit test iron losses are negligible because
(a) the current on secondary side is negligible
(b) the voltage on secondary side does not vary
(c) the voltage applied on primary side is low
(d) full-load current is not supplied to the transformer
Ans: c

80. Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in
(a)     short-circuiting of the secondaries
(b)     power factor of one of the transformers is leading while that of the other lagging
(c) transformers having higher copper losses will have negligible core losses
(d) loading of the transformers not in proportion to their kVA ratings
Ans: d

⇒ 1 TO 20 Transformer MCQ                                     ⇨  20 TO 40 Transformer MCQ                    

TOP  Electrical Transformers MCQ 

 Electrical Engineering MCQ 20 TO 40

 Multiple Choice Questions and Answers 

Latest Transformers Interview Questions and Answers List

22. In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are
(a) friction and windage losses
(b) copper losses
(c) hysteresis and eddy current losses
(d)     none of the above
Ans: c

23. A common method of cooling a power transformer is
(a) natural air cooling
(b) air blast cooling
(c) oil cooling
(d)     any of the above
Ans: c

24. The no load current in a transformer lags behind the applied voltage by an angle of about
(a) 180°
(b) 120"
(c) 90°
(d) 75°
Ans: d

25. In a transformer routine efficiency depends upon
(a) supply frequency
(b) load current
(c) power factor of load
(d) both (b) and (c)
Ans: d

27. Natural oil cooling is used for transformers up to a rating of
(a) 3000 kVA
(b) 1000 kVA
(c) 500 kVA
(d) 250 kVA
Ans: a

28. Power transformers are designed to have maximum efficiency at
(a) nearly full load
(b) 70% full load
(c) 50% full load  
(d) no load
Ans: a

29. The maximum efficiency of a distribution transformer is
(a)     at no load
(b)     at 50% full load
(c) at 80% full load
(d) at full load
Ans: b

30. Transformer breaths in when
(a) load on it increases
(b) load on it decreases
(c) load remains constant
(d) none of the above
Ans: b

31. No-load current of a transformer has
(a) has high magnitude and low power factor
(b) has high magnitude and high power factor
(c) has small magnitude and high power factor
(d) has small magnitude and low power factor
Ans: d

32. Spacers are provided between adjacent coils
(a)     to provide free passage to the cooling oil
(b)     to insulate the coils from each other
(c) both (a) and (b)
(d) none of the above
Ans: a

33. Greater the secondary leakage flux
(a) less will be the secondary induced e.m.f.
(b) less will be the primary induced e.m.f.
(c) less will be the primary terminal voltage
(d) none of the above
Ans: a

34. The purpose of providing iron core in a step-up transformer is
(a)     to provide coupling between primary and secondary
(b) to increase the magnitude of mutual flux
(c) to decrease the magnitude of mag-netizing current
(d) to provide all above features
Ans: c

35. The power transformer is a constant
(a) voltage device
(b) current device
(c) power device   
(d) main flux device
Ans: d

36. Two transformers operating in parallel will share the load depending upon their
(a) leakage reactance
(b) per unit impedance
(c) efficiencies
(d)     ratings
Ans: b

37. If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be
(a) R2/VK
(b) R2IK2
(c) R22!K2
(d) R22/K
Ans: b

38. What will happen if the transformers working in parallel are not connected with regard to polarity ?
(a) The power factor of the two trans-formers will be different from the power factor of common load
(b) Incorrect polarity will result in dead short circuit
(c) The transformers will not share load in proportion to their kVA ratings
(d)     none of the above
Ans: b

39. If the percentage impedances of the two transformers working in parallel are different, then
(a) transformers will be overheated
(b) power factors of both the transformers will be same
(c) parallel operation will be not possible
(d)     parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load
Ans: d

40. In a transformer the tappings are generally provided on
(a)     primary side
(b)     secondary side
(c) low voltage side
(d) high voltage side
Ans: c

1 TO 20 Transformer MCQ

Here You Can Also Read In Detail About 

1) Type of Losses in Transformer

2)   Basic Concept of Transformer

TOP  Electrical Transformers MCQ 

 Electrical Engineering MCQ 1 TO 20

 Multiple Choice Questions and Answers

Latest Transformers Interview Questions and Answers List

1.  Which of the following does not change in a transformer ?
(a)  Current
(b) Voltage
(c) Frequency
(d) All of the above
Ans: c

2.  In a transformer the energy is conveyed from primary to secondary
(a) through cooling coil
(b) through air
(c) by the flux
(d) none of the above
Ans: c

3. A transformer core is laminated to
(a) reduce hysteresis loss
(b) reduce eddy current losses
(c) reduce copper losses
(d) reduce all above losses
Ans: b

4. The degree of mechanical vibrations produced by the laminations of a transformer depends on
(a) tightness of clamping
(b) gauge of laminations
(c) size of laminations
(d)     all of the above
Ans: d

5. The no-load current drawn by transformer is usually what per cent of the full-load current ?
(a) 0.2 to 0.5 per cent
(b) 2 to 5 per cent
(c) 12 to 15 per cent
(d) 20 to 30 per cent
Ans: b

6. The path of a magnetic flux in a transformer should have
(a) high resistance
(b) high reluctance
(c) low resistance
(d) low reluctance
Ans: d

7. No-load on a transformer is carried out to determine
(a) copper loss
(b) magnetising current
(c) magnetising current and loss
(d) efficiency of the transformer
Ans: c

8. The dielectric strength of transformer oil is expected to be
(a)  lkV
(b)  33 kV
(c)  100 kV
(d) 330 kV
Ans: b

9.   Sumpner's test is conducted on trans-formers to determine
(a)     temperature  
(b)     stray losses
(c) all-day efficiency
(d) none of the above
Ans: a

10. The permissible flux density in case of cold rolled grain oriented steel is around
(a) 1.7 Wb/m2
(b) 2.7 Wb/m2
(c) 3.7 Wb/m2
(d) 4.7 Wb/m2
Ans: a

11. The efficiency of a transformer will be maximum when
(a) copper losses = hysteresis losses
(b) hysteresis losses = eddy current losses
(c) eddy current losses = copper losses
(d) copper losses = iron losses
Ans: d

12. No-load current in a transformer
(a) lags behind the voltage by about 75°
(b) leads the voltage by about 75°
(c) lags behind the voltage by about 15°
(d) leads the voltage by about 15°
Ans: a

13. The purpose of providing an iron core in a transformer is to
(a) provide support to windings
(b) reduce hysteresis loss
(c) decrease the reluctance of the magnetic path
(d) reduce eddy current losses
Ans: c

14. Which of the following is not a part of transformer installation ?
(a) Conservator  
(b) Breather
(c) Buchholz relay
(d) Exciter
Ans: d

15. While conducting short-circuit test on a transformer the following side is short circuited
(a) High voltage side
(b) Low voltage side
(c) Primary side 
(d)     Secondary side
Ans: b

16.    In the transformer following winding has got more cross-sectional area
(a) Low voltage winding
(b) High voltage winding
(c) Primary winding
(d)     Secondary winding
Ans: a

17.   A transformer transforms
(a) voltage
(b) current
(c) power
(d) frequency
Ans: c

18. A transformer cannot raise or lower the voltage of a D.C. supply because
(a) there is no need to change the D.C. voltage
(b) a D.C. circuit has more losses
(c) Faraday's laws of electromagnetic induction are not valid since the rate of change of flux is zero
(d) none of the above
Ans: c

19. Primary winding of a transformer
(a) is always a low voltage winding
(b) is always a high voltage winding
(c) could either be a low voltage or high voltage winding
(d)     none of the above
Ans: c

20. Which winding in a transformer has more number of turns ?
(a)     Low voltage winding
(b)     High voltage winding
(c) Primary winding
(d) Secondary winding
Ans: b

Transformer MCQ 20-40                                                Transformer MCQ 60-80           

Here You Can Alse Read In Detail About 

  1 )  Types of Losses in Transformer

   2)  Basic Concept-of-transformer

Losses in transformer 

What are the losses in transformer ?

   Two main loss :

   1) Iron loss in core
   2) copper loss in winding

   
(1)→   Core losses, collectively called magnetizing current losses, consist of:

Hysteresis losses :
due to nonlinear application of the voltage applied in the transformer core, and

Eddy current losses :
due to joule heating in the core that are proportional to the square of the transformer's applied voltage.
.
(2) →  Copper loss due to resistance  of windings
Joule losses :
due to resistance in the primary and secondary windings.
Leakage flux that escapes from the core and passes through one winding only resulting in primary and secondary reactive impedance.
  .
 (3) → Magnetostriction related transformer hum (noice)
Magnetic flux in a ferromagnetic material, such as the core, causes it to physically expand and contract slightly with each cycle of the magnetic field, an effect known as magnetostriction, the frictional energy of which produces an audible noise known as mains hum or transformer hum .
.
(4)→  Stray losses
Leakage inductance is by itself largely lossless, since energy supplied to its magnetic fields is returned to the supply with the next half-cycle. However, any leakage flux that intercepts nearby conductive materials such as the transformer's support structure will give rise to eddy currents and be converted to heat. There are also radiative losses due to the oscillating magnetic field but these are usually small.

⇒Here Also You Can 1 ) Read Definition and Working Of Transformer

                                 2)  electrical-engineering-MCQ-on Transformer

Basic concept of Transformer

Definition of Transformer :

 Electrical power transformer is a static device which transforms electrical energy from one circuit to another without any direct electrical connection and with the help of mutual induction between two windings. It transforms power from one circuit to another without changing its frequency but may be in different power level.

A transformer is a device that transforms voltage from one level to another. Transformer working is based on mutual emf induction between two coils, which are magnetically coupled.

Working Principle Of Transformer :

 When an AC voltage is applied to one of the windings (called as the primary), it produces alternating magnetic flux in the core made of magnetic material (usually some form of steel). 

The flux is produced by a small magnetizing current which flows through the winding. The alternating magnetic flux induces an electromotive force (EMF) in the secondary winding magnetically linked with the same core and appears as

a voltage across the terminals of this winding. Cold rolled grain oriented (CRGO) steel is used as the core material to provide a low reluctance, low loss flux path. The steel is in the form of varnished laminations to reduce eddy current flow and losses on account of this.

There is a very simple and straight relationship between the potential across the primary coil and the potential induced in the secondary coil. The ratio of the primary potential to the secondary potential is the ratio of the number

of turns in each and is represented as follows:

            N1/N2 = V1/V2

Current-induced
When the transformer is loaded, then the current is inversely proportional to the voltages and is represented as follows:
             N1/N2 = V1/V2= I2/I1

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