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4

At critical point, i.e. p = 225.65 kg/cm², the latent enthalpy of vaporisation is

A. Maximum

B. Minimum

C. Zero

D. Depends on temperature also

Correct Answer :

C. Zero


Related Questions

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4

An ideal regenerative cycle is

A. Equal to Carnot cycle

B. Less than Carnot cycle

C. More than Carnot cycle

D. Could be anything

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4

The ratio of the isentropic heat drop to the heat supplied, is called

A. Reheat factor

B. Stage efficiency

C. Internal efficiency

D. Rankine efficiency

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4

A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as

A. Steam condenser

B. Steam boiler

C. Steam preheater

D. Economiser

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4

The high pressure and low pressure cylinders in a Tandem type compound engine are regarded as having cranks

A. 180° to each other

B. 90° to each other

C. 0° to each other

D. None of these

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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

The bituminous coal is no caking if its carbon content is

A. 78-81 %

B. 81-85 %

C. 85-90 %

D. 90-95 %

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4

The diameter of fire tube of Cornish boiler compared to its shell is

A. One half

B. One third

C. One fourth

D. One fifth

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4

In forced circulation steam boilers, the force is applied

A. To draw water

B. To circulate water

C. To drain off the water

D. All of these

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4

The factor of evaporation for all boilers is always

A. Equal to unity

B. Less than unity

C. Greater than unity

D. None of these

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4

In a single acting steam engine

A. The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft

B. The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft

C. The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft

D. The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft

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4

The basic purpose of drum in boiler is to

A. Serve as storage of steam

B. Serve as storage of feed water for water wall

C. Remove salts from water

D. Separate steam from water

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4

The diagram efficiency is the ratio of

A. Workdone on the blades to the energy supplied to the blades

B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

C. Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

D. None of the above

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4

Which type of boiler can meet rapid changes of load?

A. Vertical fire tube type

B. Horizontal fire tube type

C. Horizontal water tube type

D. Forced circulation type

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4

Steam in water tube boiler as compared to fire tube boiler

A. Can be raised rapidly

B. Is raised at slower rate

C. Is raised at same rate

D. Could be raised at fast/slow rate depending on design

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4

The equivalent evaporation is defined as

A. The ratio of heat actually used in producing the steam to the heat liberated in the furnace

B. The amount of water evaporated or steam produced in kg per kg of fuel burnt

C. The amount of water evaporated from and at 100°C into dry and saturated steam

D. The evaporation of 15.653 kg of water per hour from and at 100°C

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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

A binary vapour plant consists of

A. Steam turbine

B. Steam condenser

C. Mercury boiler

D. All 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

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

A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called

A. Blow off cock

B. Stop valve

C. Superheater

D. None of these

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4

At critical point, i.e. p = 225.65 kg/cm², the latent enthalpy of vaporisation is

A. Maximum

B. Minimum

C. Zero

D. Depends on temperature also

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4

Sulphur in coal results in

A. Corroding air heaters

B. Spontaneous combustion during coal storage

C. Facilitating ash precipitation

D. All of the above

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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

Which of the following varieties of coals is mostly used in steam boilers?

A. Non-coking bituminous coal

B. Brown coal

C. Peat

D. None of the above

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4

The ratio of the workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam is called

A. Blading efficiency

B. Nozzle efficiency

C. Stage efficiency

D. Mechanical efficiency

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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

The rate of steam produced in Benson boiler is

A. 100 tonnes/h

B. 135 tonnes/h

C. 175 tonnes/h

D. 250 tonnes/h

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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 supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop

A. Remains the same

B. Increases

C. Decreases

D. Is unpredictable

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4

In fire tube boilers

A. Water passes through the tubes which are surrounded by flames and hot gases

B. The flames and hot gases pass through the tubes which are surrounded by water

C. Forced circulation takes place

D. None of these