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Study 121 Electrical Engineering MCQs with correct answers and explanations.

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31Electrical EngineeringMedium

In steam turbines the reheat factor________?

Anone of the above

Bdecreases with the increase in number of stages

Cremains same irrespective of number of stages

Dincreases with the increase in number of stages

Correct answer

D. increases with the increase in number of stages

Explanation

The correct answer is increases with the increase in number of stages.

32Electrical EngineeringMedium

Pipes carrying steam are generally made up of________?

Asteel

Bcopper

Caluminium

Dcast iron

Correct answer

A. steel

Explanation

The correct answer is steel.

33Electrical EngineeringMedium

The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?

Aincrease or decrease depending upon the exit quality of steam

Bno change in exit velocity from the nozzle

Cincrease in exit velocity from the nozzle

Ddecrease in exit velocity from the nozzle

Correct answer

D. decrease in exit velocity from the nozzle

Explanation

The correct answer is decrease in exit velocity from the nozzle.

34Electrical EngineeringMedium

Compounding of steam turbine is done for________?

Areducing the rotor speed

Breducing the work done

Cbalancing the turbine

Dincreasing the rotor speed

Correct answer

A. reducing the rotor speed

Explanation

The correct answer is reducing the rotor speed.

35Electrical EngineeringMedium

Bucket elevators are used for________?

Acarrying coal in vertical direction

Bcarrying coal in horizontal direction

Ccarrying coal in any direction

Correct answer

A. carrying coal in vertical direction

Explanation

The correct answer is carrying coal in vertical direction.

36Electrical EngineeringMedium

A turbine is tripped when?

Aspeed shoots up

Bsteam flow gets clogged

Cexhaust gets choked

Dinlet pressure increase

Correct answer

A. speed shoots up

Explanation

The correct answer is speed shoots up.

37Electrical EngineeringMedium

The maximum length of a screw conveyer is about________?

A40 metres

B60 metres

C100 metres

D30 metres

Correct answer

D. 30 metres

Explanation

The correct answer is 30 metres.

38Electrical EngineeringMedium

In a regenerative feed heating cycle, the greatest economy is affected________?

Awhen steam is extracted only from the last stage of steam turbine

Bwhen steam is extracted from several places in different stages of steam turbine

Cwhen steam is extracted only from the first stage of steam turbine

Dwhen steam is extracted from only one suitable point of steam turbine

Correct answer

B. when steam is extracted from several places in different stages of steam turbine

Explanation

The correct answer is when steam is extracted from several places in different stages of steam turbine.

39Electrical EngineeringMedium

The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is________?

A0.555

B0.6

C0.5457

D0.578

Correct answer

C. 0.5457

Explanation

The correct answer is 0.5457.

40Electrical EngineeringMedium

Which of the following device is used to measure vacuum?

AVenturi metre

BBarometer

CHygrometer

DU-tube manometer

Correct answer

D. U-tube manometer

Explanation

The correct answer is U-tube manometer.

In steam turbines the reheat factor________?

Anone of the above

Bdecreases with the increase in number of stages

Cremains same irrespective of number of stages

Dincreases with the increase in number of stages

Correct answer

D. increases with the increase in number of stages

Explanation

The correct answer is increases with the increase in number of stages.

The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?

Aincrease or decrease depending upon the exit quality of steam

Bno change in exit velocity from the nozzle

Cincrease in exit velocity from the nozzle

Ddecrease in exit velocity from the nozzle

Correct answer

D. decrease in exit velocity from the nozzle

Explanation

The correct answer is decrease in exit velocity from the nozzle.

In a regenerative feed heating cycle, the greatest economy is affected________?

Awhen steam is extracted only from the last stage of steam turbine

Bwhen steam is extracted from several places in different stages of steam turbine

Cwhen steam is extracted only from the first stage of steam turbine

Dwhen steam is extracted from only one suitable point of steam turbine

Correct answer

B. when steam is extracted from several places in different stages of steam turbine

Explanation

The correct answer is when steam is extracted from several places in different stages of steam turbine.