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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

Correct Answer :

A. Can be raised rapidly


Related Questions

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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

Efficiency of Rankine cycle can be increased by

A. Decreasing initial steam pressure and temperature

B. Increasing exhaust pressure

C. Decreasing exhausts pressure

D. Increasing the expansion ratio

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4

Green coal, in order to be burnt, must be

A. Heated sufficiently

B. Burnt in excess air

C. Heated to its ignition point

D. Burnt as powder

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4

In locomotives, the draught is produced by

A. Chimney

B. Induced draft fan

C. Both combined (A) and (B)

D. Steam jet draught

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4

Locomotive boiler is a

A. Single tube, horizontal, internally fired and stationary boiler

B. Single tube, vertical, externally fired and stationary boiler

C. Multi-tubular, horizontal, internally fired and mobile boiler

D. Multi-tubular, horizontal, externally fired and stationary boiler

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4

Which of the following statement is correct?

A. The efficiency of steam turbines is greater than steam engines

B. A flywheel is a must for steam turbine

C. The turbine blades do not change the direction of steam issuing from the nozzle

D. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades

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Water tube boilers are

A. Internally fired

B. Externally fired

C. Internally as well as externally fired

D. None of these

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4

A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

A. Blow off cock

B. Fusible plug

C. Stop valve

D. Safety valve

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4

When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

A. Internally fired boiler

B. Externally fired boiler

C. Natural circulation boiler

D. Forced circulation boiler

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4

An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.

A. Equal

B. Less

C. More

D. None of these

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4

When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a

A. Slow speed engine

B. Medium speed steam engine

C. High speed steam engine

D. None of these

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4

The ratio of the actual vacuum to the ideal vacuum in a condenser is called

A. Condenser efficiency

B. Vacuum efficiency

C. Nozzle efficiency

D. Boiler efficiency

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The power of a boiler may be 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

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

Which of the following statement is wrong?

A. The mechanical draught reduces the height of chimney.

B. The natural draught reduces the fuel consumption.

C. A balanced draught is a combination of induced and forced draught.

D. All of the above

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4

The draught may be produced by a

A. Mechanical fan

B. Chimney

C. A steam jet

D. All of these

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4

The effect of friction on the flow of steam through a nozzle is to

A. Decrease the mass flow rate and to increase the wetness of steam

B. Increase the mass flow rate and to increase the exit temperature

C. Decrease the mass flow rate and to decrease the wetness of steam

D. Increase the exit temperature without any effect on mass flow rate

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4

The steam temperature with increase in load in case of a boiler fitted with radiation superheater

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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4

A safety valve mainly used with locomotive and marine boilers is

A. Lever safety valve

B. Dead weight safety valve

C. High steam and low water safety valve

D. Spring loaded safety valve

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4

Ultimate 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

The function of a safety valve is

A. To blow off steam when the pressure of steam inside the boiler exceeds the working pressure

B. To indicate the water level inside the boiler to an observer

C. To measure pressure of steam inside the steam boiler

D. None of the above

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4

Alkaline pyrogallate is used in Orsat's apparatus for absorption of

A. CO₂

B. CO

C. O₂

D. N₂

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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 water tubes in a simple vertical boiler are

A. Horizontal

B. Vertical

C. Inclined

D. None of these

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4

The ratio of heat equivalent to brake power to the energy supplied in steam is known as

A. Mechanical efficiency

B. Overall efficiency

C. Indicated thermal efficiency

D. Brake thermal efficiency

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4

In a reaction turbine when the degree of reaction is zero, then there is

A. No heat drop in moving blades

B. No heat drop in fixed blades

C. Maximum heat drop in moving blades

D. Maximum heat drop in fixed blades

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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

Blow off cock in a boiler is used 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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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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Sulphur content of fuels is very important to the plant operators because it

A. Has high heating value

B. Retards electric precipitation

C. Promotes complete combustion

D. Has highly corrosive effect