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4

In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

A. 50°C and normal atmospheric pressure

B. 50°C and 1.1 bar pressure

C. 100°C and normal atmospheric pressure

D. 100°C and 1.1 bar pressure

Correct Answer :

C. 100°C and normal atmospheric pressure


Related Questions

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4

In a throttling process

A. Heat transfer takes place

B. Work is done by the expanding steam

C. Internal energy of steam changes

D. None of the above

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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

A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly

A. 150 kg/h

B. 210 kg/h

C. 280 kg/h

D. 340 kg/h

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4

Stoichiometric quantity of air is the

A. Air present in atmosphere at NTP conditions

B. Air required for complete combustion of fuel with no excess air

C. Air required for optimum combustion so as to have reasonable excess air

D. Air required to convert CO into CO₂

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4

The steam leaves 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

The ratio of the useful heat drop to the isentropic heat drop is called

A. Condenser efficiency

B. Nozzle efficiency

C. Boiler efficiency

D. Vacuum efficiency

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4

The ratio of heat utilised to produce steam and the heat liberated in furnace is known as

A. Boiler effectiveness

B. Boiler evaporative capacity

C. Factor of evaporation

D. Boiler efficiency

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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

The heat loss in a boiler takes place in the form of

A. Heat carried away by flue gases

B. Heat carried away by ash

C. Moisture present in fuel and steam formed by combustion of hydrogen in fuel

D. All of the above

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4

Equivalent evaporation is the amount of water evaporated in a boiler from and at

A. 0°C

B. 100°C

C. Saturation temperature at given pressure

D. Room temperature

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4

Which is not the correct statement about moisture in coal?

A. Inherent moisture and surface moisture are different things

B. In some coals moisture may be present up to 40%

C. Some moisture in coal helps in better burning which is not possible with completely dry coal

D. It increases thermal efficiency

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4

A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly

A. 1.05

B. 2.86

C. 6.65

D. 10.05

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4

Blading efficiency is also known as

A. Stage efficiency

B. Diagram efficiency

C. Nozzle efficiency

D. None of these

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4

The biggest size of thermal power unit operating in India is

A. 30 MW

B. 60 MW

C. 100 MW

D. 500 MW

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4

In order to reduce the rotor speed of an impulse turbine, the method employed is

A. Velocity compounding

B. Pressure compounding

C. Pressure-velocity compounding

D. All of these

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4

The length of Cornish boiler varies from

A. 2 to 4.5 m

B. 3 to 5 m

C. 5 to 7.5 m

D. 7 to 9 m

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4

Throttle governing of steam engines is a method of controlling the engine output by varying

A. Volume of intake steam

B. Pressure of intake steam

C. Temperature of intake steam

D. All of these

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4

Bomb calorimeter is used to determine

A. Higher calorific value at constant volume

B. Lower calorific value at constant volume

C. Higher calorific value at constant pressure

D. Lower calorific value at constant pressure

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4

A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called

A. Receiver type compound engine

B. Tandem type compound engine

C. Woolf type compound engine

D. None of these

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4

The friction present between the steam and the nozzle surfaces reduces the heat drop by

A. 10 to 15 %

B. 15 to 25 %

C. 25 to 40 %

D. 40 to 60 %

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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

In a receiver type compound engine, the high pressure and low pressure cylinders

A. Have common piston rod

B. Are set at 90°

C. Have separate piston rods

D. Are set in V-arrangement

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4

The effect of super-saturation is that the

A. Mass of the steam discharged increases

B. Entropy and specific volume of the steam increases

C. Exit velocity of steam reduces

D. All of these

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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

A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called

A. Receiver type compound engine

B. Tandem type compound engine

C. Woolf type compound engine

D. Both (A) and (B)

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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

The diameter of cylindrical shell of the Lancashire boiler is of the order of

A. 1 to 1.25m

B. 1 to 1.75 m

C. 2 to 4 m

D. 1.75 to 2.75 m.

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4

Which of the following is required for a steam condensing plant?

A. Condenser

B. Condensate pump

C. Air extraction pump

D. All of these

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4

In cross compounding, the cylinders are arranged

A. Side by side and each cylinder has common piston, connecting rod and crank

B. Side by side and each cylinder has separate piston, connecting rod and crank

C. At 90° and each cylinder has common piston, connecting rod and crank

D. At 90° and each cylinder has separate piston, connecting rod and crank

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4

The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

A. More

B. Less

C. Same

D. None of these