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4

A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

A. 79 m/s

B. 188 m/s

C. 450 m/s

D. 900 m/s

Correct Answer :

C. 450 m/s


Related Questions

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Cut-off governing of steam engines is a method of controlling the engine output by varying

A. Volume of intake steam

B. Pressure of intake steam

C. Temperature of intake steam

D. All of these

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A single acting steam engine produces ________ power than that of double acting steam engine.

A. Equal

B. Half

C. Double

D. Four times

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The actual power generated in the engine cylinder is called

A. Indicated power

B. Brake power

C. Frictional power

D. None of these

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The process of maintaining the speed of the turbine constant for various load conditions, is known as

A. Bleeding

B. Reheating

C. Governing

D. None of these

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Sulphur content of fuels is very important to the plant operators because it

A. Has high heating value

B. Retards electric precipitation

C. Promotes complete combustion

D. Has highly corrosive effect

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Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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

A. Have common piston rod

B. Are set at 90°

C. Have separate piston rods

D. Are set in V-arrangement

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4

Which of the following statement is correct?

A. A fire tube boiler occupies less space than a water tube boiler, for a given power.

B. Steam at a high pressure and in large quantities can be produced with a simple vertical boiler.

C. A simple vertical boiler has one fire tube.

D. All of the above

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The ratio of the clearance volume to the swept volume is called

A. Cut-off ratio

B. Expansion ratio

C. Clearance ratio

D. None of these

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4

At critical point, i.e. p = 225.65 kg/cm², the latent enthalpy of vaporisation is

A. Maximum

B. Minimum

C. Zero

D. Depends on temperature also

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4

The diameter of internal flue tubes in a Lancashire boiler compared to its shell is

A. One-half

B. One-third

C. Two-fourth

D. Two-fifth

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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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Lancashire boiler is a

A. Stationary fire tube boiler

B. Stationary water tube boiler

C. Water tube boiler with natural/forced circulation

D. Mobile fire tube boiler

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The diameter of fire tube of Cornish boiler compared to its shell is

A. One half

B. One third

C. One fourth

D. One fifth

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The maximum heat loss is a boiler occurs due to

A. Moisture in fuel

B. Dry flue gases

C. Steam formation

D. Unburnt carbon

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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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With increase in load, radiant superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

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The water tubes in a simple vertical boiler are

A. Horizontal

B. Vertical

C. Inclined

D. None of these

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The critical pressure at which latent heat of vaporisation is zero is

A. 225.65 kgf/ cm²

B. 273 kgf/ cm²

C. 100 kgf/ cm²

D. 1 kgf/ cm²

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Steam turbines are used for

A. Large marine propulsion

B. Electric power generation

C. Direct drive of fans, compressors, pumps

D. All of these

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When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, 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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Blow off cock in a boiler is used to

A. Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

B. Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

C. Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

D. Increase the temperature of saturated steam without raising its pressure

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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

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Which of the following compound steam engine requires a smaller flywheel?

A. Receiver type

B. Tandem type

C. Woolf type

D. All of these

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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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The diameter of superheated tubes in a locomotive boiler is

A. 13 mm

B. 31 mm

C. 130 mm

D. 230 mm

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The size of a boiler drum in pulverised fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

A. Increases

B. Decreases

C. Remains unchanged

D. Increases/decreases depending on steam temperature requirements

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The fittings mounted on the boiler for its proper and safe functioning is a

A. Water level indicator

B. Pressure gauge

C. Safety valve

D. All of these

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A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called

A. Receiver type compound engine

B. Tandem type compound engine

C. Woolf type compound engine

D. None of these

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Locomotive type' boiler is

A. Horizontal multi-tubular water tube boiler

B. Water wall enclosed furnace type

C. Vertical tubular fire tube type

D. Horizontal multi-tubular fire tube type