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4

Spontaneous combustion is a phenomenon in which

A. All the fuel burns instantaneously producing high energy release

B. Fuel burns with less air

C. Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal

D. Explosion in furnace

Correct Answer :

C. Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal


Related Questions

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4

On Millier chart, the constant pressure lines

A. Diverge from left to right

B. Diverge from right to left

C. Are equally spaced throughout

D. First rise up and then fall

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4

Heating of dry steam above saturation temperature is known as

A. Enthalpy

B. Superheating

C. Super saturation

D. Latent heat

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4

Alkaline pyrogallate is used in Orsat's apparatus for absorption of

A. CO₂

B. CO

C. O₂

D. N₂

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4

Sublimation region is the region where

A. Solid and vapour phases are in equilibrium

B. Solid and liquid phases are in equilibrium

C. Liquid and vapour phases are in equilibrium

D. Solid, liquid and vapour phases are in equilibrium

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4

Multi-stage steam turbines are of the

A. Velocity compounded type

B. Reaction type

C. Pressure compounded type

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 function of a flywheel is

A. To convert reciprocating motion of the piston into rotary motion

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

C. To prevent fluctuation of speed

D. To keep the engine speed uniform at all load conditions

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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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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

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 natural draught is produced by

A. Steam jet

B. Centrifugal fan

C. Chimney

D. Both (A) and (B)

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4

In an ideal impulse turbine, the

A. Absolute velocity at the inlet of moving blade is equal to that at the outlet

B. Relative velocity at the inlet of the moving blade is equal to that at the outlet

C. Axial velocity at inlet is equal to that at the outlet

D. Whirl velocity at inlet is equal to that at the outlet

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4

Cut-off governing as compared to throttle governing is

A. Less efficient and less economical

B. Less efficient and more economical

C. More efficient and less economical

D. More efficient and more economical

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4

The action of steam in a steam turbine is

A. Static

B. Dynamic

C. Static and dynamic

D. Neither static nor dynamic

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4

The steam temperature with increase in load in case of a boiler fitted with radiation superheater

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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4

In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is

A. 0.007 bar

B. 0.053 bar

C. 0.06 bar

D. 0.067 bar

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4

The change in internal energy in steam engines equals to

A. Work done during the Rankine cycle

B. Work done during compression

C. Work done during adiabatic expansion

D. Change in enthalpy

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A supercritical boiler is one that operates above the pressure and temperature of following values

A. 100 kg/cm² and 540°C

B. 1 kg/cm² and 100°C

C. 218 kg/cm² abs and 373°C

D. 218 kg/cm² abs and 540°C

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4

The expansion of steam in a nozzle follows

A. Carnot cycle

B. Rankine cycle

C. Joule cycle

D. Stirling cycle

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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

The difference between Cornish boiler and Lancashire boiler is that

A. Former is fire tube type and latter is water tube type boiler

B. Former is water tube type and latter is fire tube type

C. Former contains one fire tube and latter contains two fire tubes

D. None/of the above

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4

The function of an eccentric 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

Which of the following is steam dial?

A. Non-coking bituminous coal

B. Brown coal

C. Pulverised coal

D. Coking bituminous coal

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4

Fire tube boilers are those in which

A. Flue gases pass through tubes and water around it

B. Water passes through the tubes and flue gases around it

C. Forced circulation takes place

D. Tubes are laid vertically

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4

The number of drums in Benson steam generator is

A. One

B. Two

C. One steam drum and one water drum

D. No drum

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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 reheat factor depends upon

A. Initial pressure and superheat

B. Exit pressure

C. Turbine stage efficiency

D. All of these

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4

A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as

A. Back pressure turbine

B. Pass out turbine

C. Low pressure turbine

D. Impulse turbine

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4

In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts. and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is

A. 40 %

B. 25 %

C. 50 %

D. 80 %

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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