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4

Superheating of steam is done at

A. Constant volume

B. Constant temperature

C. Constant pressure

D. Constant entropy

Correct Answer :

C. Constant pressure


Related Questions

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The fusible plug in small boilers is located

A. In the drum

B. In the fire tubes

C. Above steam dome

D. Over the combustion chamber

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4

A wet vapour can be completely specified by

A. Pressure only

B. Temperature only

C. Dryness fraction only

D. Pressure and dryness fraction

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4

At which pressure the properties of water and steam become identical

A. 0.1 kg/cm²

B. 1 kg/cm²

C. 100 kg/cm²

D. 225.6 kg/cm²

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4

The cylinder dimensions of a compound engine may be designed on the basis of

A. Equal power developed in each cylinder for uniform turning moment

B. Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders

C. Equal temperature drop in each cylinder for economy of steam

D. All of the above

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4

During storage, the heating value of coal

A. Increases

B. Decreases

C. Remain constant

D. May increase or decrease depending upon the method of storage

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4

The safety valve on boiler drum compared to safety valve on superheater is set at

A. Same value

B. Higher value

C. Lower value

D. Lower/higher depending on steam flow

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4

The fire tubes in, a Coarran and Scottish marine boiler are

A. Horizontal

B. Vertical

C. Inclined

D. Both horizontal and vertical

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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

Fire 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. Forced circulation takes place

D. Tubes are laid vertically

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4

Curtis turbine is a

A. Simple reaction turbine

B. Velocity compounded turbine

C. Pressure compounded turbine

D. Pressure-velocity compounded turbine

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4

The steam enters the nozzle at a

A. High pressure and a low velocity

B. High pressure and a high velocity

C. Low pressure and a low velocity

D. Low pressure and a high velocity

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4

When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as

A. Throttle governing

B. Cut-off governing

C. By-pass governing

D. None of these

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4

The diameter of internal flue tubes in a Lancashire boiler compared to its shell is

A. One-half

B. One-third

C. Two-fourth

D. Two-fifth

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4

Proximate analysis of fuel is determination of percentage of

A. Carbon, hydrogen, nitrogen, sulphur, moisture

B. Fixed carbon, ash, volatile matter, moisture

C. Higher calorific value

D. Lower calorific value

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4

In natural circulation type boiler,

A. Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B. Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C. Feed pump is employed to supplement natural circulation in water wall type furnace

D. Water is converted into steam in one. Pass without any recirculation

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4

In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,

A. Velocity increases

B. Velocity decreases

C. Velocity remains constant

D. Pressure remains constant

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4

Which is not correct statement about effect of sulphur in fuel?

A. It has heating value

B. It helps in electrostatic precipitation of ash in flue gases

C. It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

D. It erodes furnace walls

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4

By compounding the expansion of steam in two or more cylinders, the ratio of expansion

A. Does not change

B. Increases

C. Decreases

D. None of these

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4

A steam nozzle converts

A. Heat energy of steam into kinetic energy

B. Kinetic energy into heat energy of steam

C. Heat energy of steam into potential energy

D. Potential energy into heat energy of steam

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4

The diameter of Cornish boiler varies from

A. 0.5 to 1 m

B. 1 to 2 m

C. 1.25 to 2.5 m

D. 2 to 3 m

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4

Which of the following is a fire tube boiler?

A. Lancashire boiler

B. Babcock and Wilcox boiler

C. Yarrow boiler

D. None of these

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4

When the inlet pressure of steam is equal to the exit pressure, then

A. There is a pressure drop in the nozzle

B. Fluid flows through the nozzle

C. Pressure drops and fluid flows through the nozzle

D. There is no pressure drop and fluid does not flow through the nozzle

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4

The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the

A. Blades are equiangular

B. Blade velocity coefficient is unity

C. Blades are equiangular and frictionless

D. Blade solidity is 0.65

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4

The function of a crosshead is to guide motion of the _________ and to prevent it from bending.

A. Piston rod

B. Connecting rod

C. Eccentric rod

D. Valve rod

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4

De-Laval turbine is a

A. Single rotor impulse turbine

B. Multi-rotor impulse turbine

C. Impulse reaction turbine

D. None of these

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4

Orsat meter is used for

A. Gravimetric analysis of the flue gases

B. Volumetric analysis of the flue gases

C. Mass flow of the flue gases

D. Measuring smoke density of flue gases

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4

The major axis of elliptical manholes on the shell should be provided

A. Longitudinally

B. Circumferentially

C. On dished end

D. Anywhere

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4

The shell of the Cochran boiler is made hemispherical

A. To give maximum space and strength

B. To withstand the pressure of steam inside the boiler

C. Both (A) and (B)

D. None of the above

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4

The diameter of internal flue tubes of a Lancashire boiler is about _________ that of its shell.

A. One-fourth

B. One-third

C. Two-fifth

D. One-half

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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