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4

Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

A. 421 kg.m

B. 421 kg.m

C. 539 kg.m

D. 102 kg.m

Correct Answer :

A. 421 kg.m


Related Questions

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4

The critical pressure ratio for initially dry saturated steam is

A. 0.546

B. 0.577

C. 0.582

D. 0.601

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4

The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

A. Same

B. Less

C. More

D. None of these

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4

The number of drums in Benson steam generator is

A. One

B. Two

C. One steam drum and one water drum

D. No drum

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4

Lancashire boiler is a

A. Stationary fire tube boiler

B. Stationary water tube boiler

C. Water tube boiler with natural/forced circulation

D. Mobile fire tube boiler

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4

One kg of steam sample contains 0.8 kg dry steam; Its dryness fraction is

A. 0.2

B. 0.8

C. 1.0

D. 0.6

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4

Duplex feed pumps are used in small steam boilers. These operate on the principle of

A. Centrifugal pump

B. Axial flow pump

C. Gear pump

D. Reciprocating pump

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4

Water boils when its vapour pressure

A. Equals that of the surroundings

B. Equals 760 mm of mercury

C. Equals to atmospheric pressure

D. Equals the pressure of water in the container

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4

On Millier chart, the constant pressure lines

A. Diverge from left to right

B. Diverge from right to left

C. Are equally spaced throughout

D. First rise up and then fall

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4

The principal function of a stop valve is to

A. Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

B. Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

C. Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

D. Increase the temperature of saturated steam without raising its pressure

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4

The ratio of the volume at cut-off to the swept volume is called

A. Cut-off ratio

B. Expansion ratio

C. Clearance ratio

D. None of these

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4

Which of the following statement is correct?

A. The expansion of steam in a nozzle follows Rankine cycle.

B. The friction in the nozzle increases the dryness fraction of steam.

C. The pressure of steam at throat is called critical pressure.

D. All of the above

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4

An economiser is generally placed between

A. Last superheater or reheater and air preheater

B. Induced draft fan and forced draft fan

C. Air preheater and chimney

D. None of the above

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4

In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The function of an eccentric rod is

A. To provide reciprocating motion to the slide valve

B. To convert reciprocating motion of the piston into rotary motion of the crank

C. To convert rotary motion of the crankshaft into to and fro motion of the valve rod

D. To provide simple harmonic motion to the D-slide valve

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4

Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?

A. A steam turbine develops higher speeds

B. The efficiency of steam turbine is higher

C. The steam consumption is less

D. All of these

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4

A binary vapour plant consists of

A. Steam turbine

B. Steam condenser

C. Mercury boiler

D. All of these

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4

Adiabatic process is

A. Essentially an isentropic process

B. Non-heat transfer process

C. Reversible process

D. Constant temperature process

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4

The variation of steam pressure in the nozzle depends upon

A. Velocity of steam

B. Specific volume of steam

C. Dryness fraction of steam

D. All of these

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4

Willian's law states that the steam consumption per hour provided with a throttled governor is proportional to (where I.P. = Indicated power)

A. 1/(I.P)

B. 1/(I.P)²

C. I.P.

D. (I.P.)²

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4

The mechanical draught _________ with the amount of smoke.

A. Increases

B. Decreases

C. Does not effect

D. None of these

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4

The discharge is __________ at critical pressure.

A. Zero

B. Minimum

C. Maximum

D. None of these

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4

Willians line for the steam engine is a straight line relationship between the steam consumption per hour and

A. Indicated power

B. Brake power

C. Efficiency

D. Pressure of steam

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4

The action of steam in a steam turbine is

A. Static

B. Dynamic

C. Static and dynamic

D. Neither static nor dynamic

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4

With increase in load, convection superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

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4

Steam turbines are used for

A. Large marine propulsion

B. Electric power generation

C. Direct drive of fans, compressors, pumps

D. All of these

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4

Stage efficiency is also known as

A. Diagram efficiency

B. Nozzle efficiency

C. Gross efficiency

D. None of these

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4

Expanding steam to a very low pressure (high vacuum) in steam engines is

A. Desirable

B. Economical

C. Essential

D. Uneconomical

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4

Parson's reaction turbine is a __________ reaction turbine.

A. 40 percent

B. 50 percent

C. 60 percent

D. 70 percent

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4

The cylindrical shell of a Lancashire boiler has diameter from

A. 1 to 2 m

B. 1.25 to 2.25 m

C. 1.5 to 2.5 m

D. 1.75 to 2.75 m

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4

For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

A. More

B. Less

C. Equal

D. None of these