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4

Hard coke is produced by carburisation of coal at

A. Atmospheric temperature

B. 500-600°C

C. 700-850°C

D. 950-1100°C

Correct Answer :

D. 950-1100°C


Related Questions

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4

The shell diameter of a Locomotive boiler is

A. 1 m

B. 1.5 m

C. 2 m

D. 2.5 m

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4

Pick up the wrong statement about critical condition of steam

A. Latent heat is zero

B. Liquid directly becomes steam

C. Specific volume of steam and liquid is same

D. This is the maximum pressure limit

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4

The high pressure and low pressure cylinders in a receiver 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 value of diagram factor depends upon

A. Initial conditions of steam

B. Back pressure

C. Initial pressure of steam

D. All 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

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 high pressure boiler is one, which produces steam at a pressure more than

A. Atmospheric pressure

B. 5 kg/cm²

C. 10 kg/cm²

D. 7580 kg/cm²

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4

The expansion of steam, as it flows over the blades in reaction turbine, represents

A. Isothermal process

B. Isentropic process

C. Throttling process

D. Free expansion process

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4

The state of vapour under saturation condition is described by

A. Pressure alone

B. Temperature alone

C. Pressure and temperature

D. Pressure and dryness fraction

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4

The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.

A. More

B. Less

C. Equal

D. None of these

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4

Which of the following statement is correct?

A. Lancashire boiler is a fire tube boiler.

B. Fire tube boilers are internally fired.

C. Babcock and Wilcox boiler is a water tube boiler.

D. All of the above

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4

If the critical pressure ratio for steam is 0.546, then the steam is initially

A. Wet steam

B. Dry saturated steam

C. Superheated steam

D. None of these

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4

The latent heat of steam with increase of pressure

A. Remain same

B. Increases

C. Decreases

D. Behaves unpredictably

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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 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

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4

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

A. Have common piston rod

B. Are set at 90°

C. Have separate piston rod

D. Are set in V-arrangement

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4

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

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 draught may be produced by a

A. Mechanical fan

B. Chimney

C. A steam jet

D. All of these

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4

In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

A. Water space also

B. Chimney

C. Steam space

D. Superheater

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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

For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

A. More heating surface

B. Less heating surface

C. Equal heating surface

D. Heating surface depends on other parameters

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4

De-Laval turbine is a

A. Simple impulse turbine

B. Simple reaction turbine

C. Impulse-reaction turbine

D. None of these

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4

The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure.

A. Same as

B. 2 times

C. 4 times

D. 8 times

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4

An economiser _________ the steam raising capacity of a boiler.

A. Increases

B. Decreases

C. Has no effect on

D. None of these

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4

The amount of water evaporated in kg per kg of fuel burnt is called

A. Evaporative capacity of a boiler

B. Equivalent evaporation from and at 100° C

C. Boiler efficiency

D. None of these

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4

The pressure at which latent heat of vaporisation of water is zero, is

A. Below atmospheric pressure

B. 1 kg/cm²

C. 100 kg/cm²

D. 225.6 kg/cm²

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4

Parson's reaction turbine is a __________ reaction turbine.

A. 40 percent

B. 50 percent

C. 60 percent

D. 70 percent

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4

The velocity of whirl at outlet for an axial discharge turbine is

A. Minimum

B. Maximum

C. Zero

D. None of these

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4

Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

A. And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²

B. And its corresponding conversion into dry steam at desired boiler pressure

C. Conversion into steam at atmospheric condition

D. Conversion into steam at the same pressure at which feed water is supplied