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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

Correct Answer :

C. 5 to 7.5 m


Related Questions

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4

Latent heat of dry steam at atmospheric pressure is equal to

A. 539 kcal/ kg

B. 539 BTU/ lb

C. 427 kcal/ kg

D. 100 kcal/ kg

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4

The specific heat of superheated steam in kcal/kg is generally of the order of

A. 0.1

B. 0.3

C. 0.5

D. 0.8

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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

Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will

A. Boil

B. Flash i.e. get converted into steam

C. Remain as it was

D. Cool down

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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

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4

The best suited coal for chain or travelling grate stoker boiler is

A. Coking coal

B. Non-coking or free burning coal

C. Pulverised coal

D. High sulphur coal

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4

The ratio of the workdone on the blades to the energy supplied to the blades, is called

A. Blading efficiency

B. Nozzle efficiency

C. Gross or stage efficiency

D. Mechanical efficiency

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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

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

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

A fusible plug is fitted in small boilers in order to

A. Avoid excessive build up of pressure

B. Avoid explosion

C. Extinguish fire if water level in the boiler falls below alarming limit

D. Control steam dome

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4

The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)

A. p₁. p₂

B. p₁/p₂

C. p₂/p₁

D. p₁ + p₂

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4

In a uniflow engine

A. Steam enters and exhausts through the same port

B. Steam enters at one end and exhausts at the centre

C. Steam enters at the centre and exhausts at the other end

D. None of the above

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4

Boiler stays are used to

A. Prevent flat surfaces under pressure from tearing apart

B. Take care of failure in shear

C. Take care of failure in compression

D. Provide support for boiler

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4

During polytropic process

A. Heat transfer takes place across cylinder walls

B. Work is done

C. Steam may be wet, dry or superheated after expansion

D. All of the above

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4

The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

A. Condenser efficiency

B. Vacuum efficiency

C. Nozzle efficiency

D. Boiler efficiency

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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

Boiler parameters are expressed by

A. Tonnes/hr. of steam

B. Pressure of steam in kg/cm²

C. Temperature of steam in °C

D. All of the above

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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

With increase in load, convection superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

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4

Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?

A. Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler

B. Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler

C. Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes

D. Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube

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4

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

A. Stage efficiency

B. Internal efficiency

C. Rankine efficiency

D. None of these

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4

The maximum discharge through a chimney occurs when the height of chimney is

A. Infinitely long

B. Around 200 meters

C. Equal to the height of the hot gas column producing draught

D. Outside temperature is very low

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4

The feed check valve is used in order to

A. Regulate flow of boiler water

B. Check level of water in boiler drum

C. Recirculate unwanted feed water

D. Allow high pressure feed water to flow to drum and not allow reverse flow to take place

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4

The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.

A. Equal to

B. Less than

C. Higher than

D. None of these

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4

Water and sediment in fuel oil can be removed by

A. Heating the oil in the settling tanks

B. Cooling the oil in the settling tanks

C. Burning the oil

D. Suspension

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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

Blading efficiency is also known as

A. Stage efficiency

B. Diagram efficiency

C. Nozzle efficiency

D. None of these

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4

Which of the following are boiler accessories?

A. Economiser

B. Superheater

C. Both (A) and (B)

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