Iti electrician quiz

1➤ How to determine copper loss in a transformer?

Short circuit test Open circuit testImpulse ration testBoth A and B

2➤ What is the purpose of providing explosion vent in a power transformer?

Moisture realisingAir releasing Pressure releasing All of these

3➤ Which material is used to make core of power transformer?

Soft ironCRGOCopper alloyHRGO

4➤ Which condition is absolutely essential for parallel operation of two transformers?

Nature of loadAll of theseType of collingPhase sequence

5➤ Which type of motor is used in the wet grinder?

Repulsion motorCapacitor start motorCapacitor start capacitor run motorAll of these

6➤ What is the fault in a food mixer if it runs intermittently?

Worn out brushes Defective commutatorArmature coil openField winding partially short

7➤ What is the defect in a single phase pump motor if it runs with slow speed? |

Short in starting winding Defective capacitorShort in running windingOpen starting winding

8➤ Which material is used to make heating element?

CopperAluminium NichromeSilver

9➤ Which energy is converted into electrical energy by generator?

ChemicalKineticHeatMechanical

10➤ Which are the two points that the brush contact resistance measured in D.C machines?

Resistance between brush and commutator Resistance between brush and commutator raiserResistance between the opposite brushesAll of these

11➤ What is the name of the compound generator, if the shunt field is connected in parallel with armature?

Long shunt compound Differential compound Short shunt compound Cumulative compound

12➤ What is the necessity of residual magnetism in a self excited DC generator?

Reduce armature current Reduce the field current Build up the voltageNone of these

13➤ How many parallel paths in duplex lap winding of a 4 pole DC generator?

8 41612

14➤ Which type of DC generator is used for long distance distribution lines?

Series generatorShunt generatorCumulative compound generatorDifferential compound generator

15➤ Which is the main application of synchronous motor?

AC to DC converter Power factor correction deviceElevatorsPaper rolling mills

16➤ Which application requires only DC?

Stepping up of voltage Operating induction motorElectroplatingAll of these

17➤ Which converting device can be over loaded?

Mercury arc rectifierRotary converter Motor generator set Rectifier unit

18➤ Which acts as both inverter and converter?

Synchronous converterSemi conductor diodeMetal rectifierMercury arc rectifier

19➤ What is the name of the equipment that provides D.C to the rotor of alternator?

Converter ExciterSynchroniserInverter

20➤ What is the use of synchroscope?

Indicate the correct instant for paralleling Adjust the supply frequencyAdjust the output voltageAll of these

21➤ How alternators are rated?

KWKVAKVMW

22➤ Which is the cause for the 3 phase motor starter with single phase preventer trips frequently?

Improper phase sequenceIncorrect settings of OLR Incorrect fuse ratings |Unbalanced line voltage |

23➤ What is the name of 3 phase motor winding, if the coil pitch is less than pole pitch?

Whole coil winding Full pitch windingLong chorded winding ंShort chorded winding

24➤ Which is the demerit of 3 phase concentric winding?

It is not easy to make the end connectionMore space is required A stepped former is requiredMore difficult to shape the coils uniformly

25➤ Where the panel boards are used?

3 phase domestic wiring Domestic wiring CircuitsIndustrial motor drives Load distribution for AC & DC supply

Your score is