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Hard coke is used in

A. Cement industry

B. Thermal power plant

C. Blast furnace

D. Domestic use

Correct Answer :

C. Blast furnace


Related Questions

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The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by

A. V = 2g H'

B. V = 2g/H'

C. V = H'/2g

D. V = 2gH'

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The ratio of the energy required to produce the artificial draught (expressed in metres head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

A. Efficiency of the boiler

B. Efficiency of the chimney

C. Efficiency of the fan

D. Power of the boiler

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4

The function of a valve rod is

A. To provide reciprocating motion to the slide valve

B. To convert reciprocating motion of the piston into rotary motion of the crank

C. To convert rotary motion of the crankshaft into to and fro motion of the valve rod

D. To provide simple harmonic motion to the D-slide valve

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4

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

A. V = 44.72 hd K

B. V = 44.72 K hd

C. V = 44.72 K hd

D. V = 44.72 K hd

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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

Duplex feed pumps are used in small steam boilers. These operate on the principle of

A. Centrifugal pump

B. Axial flow pump

C. Gear pump

D. Reciprocating pump

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4

The forced circulation of water does not take place in

A. LaMont boiler

B. Lancashire boiler

C. Velox boiler

D. Benson boiler

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The ratio of the volume at cut-off to the swept volume is called

A. Cut-off ratio

B. Expansion ratio

C. Clearance ratio

D. None of these

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A nozzle is said to be a convergent nozzle

A. When the cross-section of the nozzle increases continuously from entrance to exit

B. When the cross-section of the nozzle decreases continuously from entrance to exit

C. When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit

D. None of the above

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Lancashire boiler is

A. Stationary fire tube boiler

B. Internally fired boiler

C. Horizontal boiler

D. All of these

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The cylinder condensation or missing quantity may be reduced by

A. The efficient steam jacketing of the cylinder walls

B. Superheating the steam supplied to the engine cylinder

C. Keeping the expansion ratio small in each cylinder

D. All of the above

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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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Cut-off ratio is the ratio of

A. Swept volume to the volume at cut-off

B. Volume at cut-off to the clearance volume

C. Volume at cut-off to the swept volume

D. Clearance volume to the volume at cut-off

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4

The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.

A. 0°C

B. 40°C

C. 60°C

D. 100°C

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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 average value of diagram factor lies between

A. 0.2 to 0.5

B. 0.5 to 0.65

C. 0.65 to 0.9

D. 0.8 to 1.2

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The length of Cornish boiler is of the order of

A. 24 m

B. 35 m

C. 57.5 m

D. 79 m

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In locomotive boiler, maximum steam pressure is limited to

A. 1 kg/cm²

B. 5 kg/cm²

C. 10 kg/cm²

D. 18 kg/cm²

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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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Which of the following substance will have same percentage in both proximate and ultimate analysis?

A. Ash

B. Volatile matter

C. Moisture

D. Hydrogen

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The maximum efficiency of a reaction turbine is

A. 2 sin²α/(1 + sin²α)

B. 2 cos²α/(1 + cos²α)

C. (1 + sin²α)/2 sin²α

D. (1 + cos²α)/2 cos²α

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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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The Locomotive boiler has

A. 137 fire tubes and 44 superheated tubes

B. 147 fire tubes and 34 superheated tubes

C. 157 fire tubes and 24 superheated tubes

D. 167 fire tubes and 14 superheated tubes

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An economiser is generally placed between

A. Last superheater or reheater and air preheater

B. Induced draft fan and forced draft fan

C. Air preheater and chimney

D. None of the above

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4

Which of the following statement is correct for a compound steam engine?

A. The cost of the engine, for the same power and economy, is more than that of a simple steam engine.

B. The forces in the working parts are increased as the forces are distributed over more parts.

C. The ratio of expansion is reduced, thus reducing the length of stroke.

D. The temperature range per cylinder is increased, with corresponding increase in condensation.

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In a nozzle, whole frictional loss is assumed to occur between

A. Inlet and throat

B. Inlet and outlet

C. Throat and exit

D. All of these

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Hygrometry deals with the

A. Hygroscopic substances

B. Water vapour in air

C. Temperature of air

D. Pressure of air

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In a throttling process

A. Steam temperature remains constant

B. Steam pressure remains constant

C. Steam enthalpy remains constant

D. Steam entropy remains constant

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The fusible plug in small boilers is located

A. In the drum

B. In the fire tubes

C. Above steam dome

D. Over the combustion chamber

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The fire tubes in a Locomotive boiler has _________ diameter.

A. 4.75 mm

B. 5.47 mm

C. 7.45 mm

D. 47.5 mm