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4

The critical pressure at which latent heat of vaporisation is zero is

A. 225.65 kgf/ cm²

B. 273 kgf/ cm²

C. 100 kgf/ cm²

D. 1 kgf/ cm²

Correct Answer :

A. 225.65 kgf/ cm²


Related Questions

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4

The forced circulation of water does not take place in

A. LaMont boiler

B. Lancashire boiler

C. Velox boiler

D. Benson boiler

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4

Which of the following boiler is best suited to meet the fluctuating demand of steam?

A. Locomotive boiler

B. Lancashire boiler

C. Cornish boiler

D. Babcock and Wilcox boiler

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4

The number of water level indicators in a boiler are generally _________ in number.

A. One

B. Two

C. Three

D. Four

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4

The indicated thermal efficiency is defined as the

A. Ratio of thermal efficiency to the Rankine efficiency

B. Ratio of brake power to the indicated power

C. Ratio of heat equivalent to indicated power to the energy supplied in steam

D. Product of thermal efficiency and Rankine efficiency

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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

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4

The diagram factor is the ratio of the

A. Area of the actual indicator diagram to the area of theoretical indicator diagram

B. Actual workdone per stroke to the theoretical workdone per stroke

C. Actual mean effective pressure to the theoretical mean effective pressure

D. Any one of the above

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4

The three Ts for good combustion are

A. Temperature, time, and turbulence

B. Total air, true fuel, and turbulence

C. Thorough mixing, total air and temperature

D. Total air, time, and temperature

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4

Water tube boilers are those in which

A. Flue gases pass through tubes and water around it

B. Water passes through the tubes and flue gases around it

C. Work is done during adiabatic expansion

D. Change in enthalpy

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4

Pick up the wrong statement about critical condition of steam

A. Latent heat is zero

B. Liquid directly becomes steam

C. Specific volume of steam and liquid is same

D. This is the maximum pressure limit

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4

Lancashire boiler is of

A. Stationary < fire tube type

B. Horizontal type

C. Natural circulation type

D. All of the above

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4

In water wall furnace, the heat is transferred to the water walls by

A. Convection

B. Radiation

C. Conduction

D. Radiation and conduction

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4

An air preheater is installed

A. Before the economiser

B. Before the superheater

C. Between the economiser and chimney

D. None 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

When the cross-section of a nozzle increases continuously from entrance to exit, it is called a

A. Divergent nozzle

B. Convergent nozzle

C. Convergent-divergent nozzle

D. None of these

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4

There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

A. Wet steam

B. Saturated steam

C. Superheated steam

D. Cushion steam

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4

Which is not correct statement about pulverised fuel firing?

A. High burning rate is possible

B. Heat release can be easily controlled

C. Fuel burns economically

D. It is the best technique for burning high ash content fuel having low fusion ash

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4

For water, at pressures below atmospheric;

A. Melting point rises slightly and boiling point drops markedly

B. Melting point rises markedly and boiling point drops markedly

C. Melting point drops slightly and boiling point drops markedly

D. Melting point drops slightly and boiling point drops slightly

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4

The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

A. Feed pump

B. Injector

C. Feed check valve

D. Pressure gauge

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4

The clearance in the engine cylinder

A. Increases the mean effective pressure

B. Increases the workdone

C. Decreases the efficiency of the engine

D. All of these

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4

Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

A. Higher effectiveness of boiler

B. High calorific value coal being burnt

C. Fouling of heat transfer surfaces

D. Raising of steam temperature

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4

Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

A. pa = pm/K

B. pa = pm × K

C. pa = K/pm

D. pa = pm + K

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4

The impulse reaction turbine has its driving force

A. As an impulsive force

B. As a reaction force

C. Partly as an impulsive force and partly as a reaction force

D. None of the above

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4

In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will

A. Remain unaffected

B. Improve

C. Worsen

D. May improve/worsen depending on size

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4

A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion.

A. 60°

B. 90°

C. 180°

D. 270°

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4

Which of the following coals has the highest calorific value?

A. Anthracite coal

B. Bituminous coal

C. Lignite

D. Peat

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4

The maximum discharge of steam through a convergent-divergent nozzle depends upon

A. Area of nozzle at throat

B. Initial pressure and volume of steam

C. Final pressure of steam leaving the nozzle

D. Both (A) and (B)

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4

Lancashire boiler is used where working pressure and power required are

A. Low

B. Moderate

C. High

D. None of these

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4

Locomotive boiler is of the following type

A. Multi tubular

B. Horizontal

C. Internally fired

D. All of the above

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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 diameter of a cylindrical shell of a Scotch marine boiler varies from

A. 1.5 to 2 m

B. 2.5 to 3.5 m

C. 3.5 to 4.5 m

D. None of these