Related Post

MCQ of Transformer page-1MCQ of Transformer page-2MCQ of Transformer page-3MCQ of Transformer page-4MCQ of Transformer page-5MCQ of Transformer page-6MCQ of Transformer page-7MCQ of Transformer page-8MCQ of Transformer page-9MCQ of Transformer page-10MCQ of Transformer page-11MCQ of Transformer page-12MCQ of Transformer page-13MCQ of Transformer page-14MCQ of Transformer page-15MCQ of Transformer page-16MCQ of Transformer page-17MCQ of Transformer page-18MCQ of Transformer page-19MCQ of Transformer page-20MCQ of Transformer page-21MCQ of Transformer page-22MCQ of Transformer page-23MCQ of Transformer page-24MCQ of Transformer page-25MCQ of Transformer page-26MCQ of Transformer page-27

Index

SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generatorsMCQ-Control-SystemMCQ-Measurementsmcq-of-Generation-power-systemMCQ-of-Induction-MotorMCQ-of-Transmission-DistributionMCQ-of-Electrical-MachinesMCQ-of-Alternator-and-Synchronous-MotorsMCQ-Electric-Power

MCQ of Transformer page-5


≪ Previous Next ≫

41. In a transformer, the magnitude of the mutual flux is

a) High at low loads and low at high loads
b) Low at low loads and low at high loads
c) Varies at low loads and constant at high loads
d) Same at all loads

Ans: (d)

42. Use of higher flux density in trans-former design

a) Increases the weight per kW
b) Increases the weight per kVA
c) Decreases the weight per kVA
d) Decreases the weight per kW

Ans: (c)

43. The efficiency of transformer compared with that of electric motors of the same rating is

a) About the same
b) Much higher
c) Much smaller
d) Slightly higher

Ans: (b)

44. The no load current taken by a transformer lags the applied voltage approximately by

a) 60°
b) 45°
c) 30°
d) 80°

Ans: (d)

45. An ideal transformer is one which

a) Has core of stainless steel
b) Has no losses and magnetic leakage
c) Has a common core for its primary and secondary windings
d) Has inter leaved primary and secondary windings

Ans: (b)

46. In a two winding transformer, the primary and the secondary induced emfs E1 and E2 are always

a) In phase with each other
b) Antiphase with each other
c) Of different frequency
d) Equal in magnitude

Ans: (a)

47. Distribution transformers are designed to have maximum efficiency at about

a) Full load
b) No load
c) 50% of full load
d) 75% of full load

Ans: (c)

48. Use of silicon steel for laminations in a transformer reduces

a) Eddy current losses
b) Hysteresis losses
c) Both eddy current and hysteresis losses
d) Noise generated in the transformer

Ans: (b)

49. Special silicon steel is used for the laminations of transformer, because it has

a) High resistivity and high hysteresis loss
b) High resistivity and low hysteresis loss
c) Low resistivity and high hysteresis loss
d) Low resistivity and low hysteresis loss

Ans: (b)

50. The commercial efficiency of a transformer while on open circuit is

a) Zero
b) 100%
c) 50%
d) None of these

Ans: (a)


≪ Previous Next ≫


Related topics :


Recent Post

Multiple Choice Question (MCQ) of Materials page-6:
51. The permeability and permittivity of a medium are
A) independent of each other
B) related by the atomic number
C) related by the Boltzmann’s constant
D) related by the velocity of electromagnetic waves.

Read more...

Multiple Choice Question (MCQ) of Materials page-5:
41. Bakelite is
A) highly inflammable
B) low resistance conductor
C) a semi-conductor
D) uncombustible.

Read more...

Multiple Choice Question (MCQ) of Materials page-4:
31. Which of the following pairs is commonly used in thermocouples?
A) Copper-constant
B) Aluminium-tin
C) Iron-steel
D) Silver-German silver.

Read more...