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4

The maximum steam pressure in a Locomotive boiler is limited to

A. 0.18 MN/m²

B. 1.8 MN/m²

C. 18 MN/m²

D. 180 MN/m²

Correct Answer :

B. 1.8 MN/m²


Related Questions

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The clearance in the engine cylinder

A. Increases the mean effective pressure

B. Increases the workdone

C. Decreases the efficiency of the engine

D. All of these

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4

The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)

A. ηS = ηB × ηN

B. ηS = ηB / ηN

C. ηS = ηN / ηB

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

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 overall efficiency of thermal power plant is

A. Boiler efficiency, turbine efficiency, generator efficiency

B. All the three above plus gas cycle efficiency

C. Carnot cycle efficiency

D. Regenerative cycle efficiency

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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 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

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 statement is correct?

A. A horizontal steam engine requires less floor area than a vertical steam engine

B. The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure

C. The compound steam engines are generally non-condensing steam engines

D. All of the above

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4

The critical pressure gives the velocity of steam at the throat

A. Equal to the velocity of sound

B. Less than the velocity of sound

C. More than the velocity of sound

D. None of these

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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

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

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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The relative heat absorption for successively added equal areas of boiler convection heating surfaces

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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The number of flue tubes in Lancashire boiler is

A. Zero

B. One

C. Two

D. Four

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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

The average operating pressure of Benson boiler is

A. 100 bar

B. 150 bar

C. 200 bar

D. 250 bar

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An air preheater

A. Increases evaporative capacity of the boiler

B. Increases the efficiency of the boiler

C. Enables low grade fuel to be burnt

D. All of the above

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4

Steam turbines may be classified according to

A. Direction of steam flow

B. Number of stages

C. Mode of steam action

D. All of these

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4

The function of a piston rod is

A. To guide motion of the piston rod and to prevent it from bending

B. To transfer motion from the piston to the cross head

C. To convert heat energy of the steam into mechanical work

D. To exhaust steam from the cylinder at proper moment

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4

Hygrometry deals with the

A. Hygroscopic substances

B. Water vapour in air

C. Temperature of air

D. Pressure of air

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The three Ts for good combustion are

A. Temperature, time, and turbulence

B. Total air, true fuel, and turbulence

C. Thorough mixing, total air and temperature

D. Total air, time, and temperature

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4

A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as

A. Superheater

B. Air-preheater

C. Economiser

D. Injector

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The discharge is __________ at critical pressure.

A. Zero

B. Minimum

C. Maximum

D. None of these

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The water tubes in a Babcock and Wilcox boiler are

A. Horizontal

B. Vertical

C. Inclined

D. Horizontal and inclined

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The relative efficiency is defined as the

A. Ratio of thermal efficiency to 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 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

With increase in load, radiant superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

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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