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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-generators

Objective questions and answers or MCQ of Electrical Machines page-16

251. In an electromagnet

a) Current must flow through the coil to produce magnetic field
b) The magnetic field has the same strength with or without current
c) Current must flow but no voltage need be applied across the coil
d) The coil must have high resistance for minimum coil current

Ans: (a)

252. The motor action in a wire conducting current can be produced

a) Without any additional magnetic field
b) By moving the conductor from a weaker field towards stronger field
c) By moving the conductor from stronger field towards weaker field
d) By producing the motion by not rotation

Ans: (c)

253. The requirement for producing induced voltage is

a) Magnetic flux moving across a conductor
b) Magnetic flux moving across a dielectric
c) An insulated wire free from any external magnetic field
d) A bare wire moving parallel to an external magnetic field

Ans: (a)

254. A 5:1 voltage step up transformer has 120 volts across the primary and 600 ohms resistance across the secondary. Assuming 100% efficiency the primary current equals

a) 1/5 amp
b) 500 ma
c) 10 amps
d) 20 amps
e) 5 amps

Ans: (e)

255. In a transformer, the voltage induced in the secondary winding must always be 90 degree out of phase with the

a) Primary voltage
b) Primary current
c) Secondary voltage
d) Secondary current

Ans: (b)

256. A ferrite core has less eddy-current loss than an iron a core because

a) Ferrites have low resistance
b) Ferrites have high resistance
c) Ferrites have low permeability
d) Ferrites have high hysteresis

Ans: (b)

257. Which of the following motors is usually used in household refrigerators?

a) D.c. shunt motor
b) Reluctance motor
c) Single phase induction motor (split phase start or induction run motor)
d) Synchronous motor

Ans: (c)

258. If the refrigerator unit runs continuously maintaining cabinet coil, the failure of unit is attributed to

a) Extreme hot weather conditions
b) Poor door seal at gasket
c) Defective motor
d) Defective thermostat

Ans: (d)

259. The maximum temperature permitted for Class A insulation is

a) 180° C
b) 105° C
c) 120° C
d) 155° C

Ans: (b)

260. The cotton, silk paper, and wood are

a) Class A insulation
b) Class Y insulation
c) Class H insulation
d) Class B insulation

Ans: (b)

261. Rheostatic breaking gives greater braking torque than plugging.

a) True
b) False

Ans: (b)

262. Which of the following rules states that the direction of an induced current is always such that the magnetic field which it produces reacts in opposition to the change of flux.

a) Thumb rule
b) Lenz’s law
c) Kirchhoff’s law
d) Faraday’s law

Ans: (b)

263. What conditions are necessary for an induced voltage to be created by means of rotation.

a) A magnetic field
b) Movably placed loops conductors (turns)
c) Lump conductors
d) (a) and (b) both

Ans: (d)

264. In the following diagram of a line conductor, in which direction do the magnetic lines of force run if the observer is looking in the direction of current?

a) Counter-clockwise around the conductor
b) Clockwise around the conductor
c) Around the conductor
d) Outside the conductor

Ans: (b)

265. Which of the following rule is applied to above question to field direction of magnetic lines?

a) Left-hand rule
b) Right-hand rule
c) Corkscrew rule
d) Lenz’s law

Ans: (c)

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