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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

Correct Answer :

B. 50 percent


Related Questions

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4

In natural circulation type boiler,

A. Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B. Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C. Feed pump is employed to supplement natural circulation in water wall type furnace

D. Water is converted into steam in one. Pass without any recirculation

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Which of the following is required for a steam condensing plant?

A. Condenser

B. Condensate pump

C. Air extraction pump

D. All of these

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4

Efficiency of a thermal cycle increases by

A. Regeneration

B. Reheating of steam

C. Both (A) and (B)

D. Cooling of steam

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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

Steam in water tube boiler as compared to fire tube boiler

A. Can be raised rapidly

B. Is raised at slower rate

C. Is raised at same rate

D. Could be raised at fast/slow rate depending on design

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4

In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine

A. Lancashire boiler

B. Locomotive boiler

C. Babcock and Wilcox boiler

D. Benson boiler

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4

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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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

Green coal, in order to be burnt, must be

A. Heated sufficiently

B. Burnt in excess air

C. Heated to its ignition point

D. Burnt as powder

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4

Expanding steam to a very low pressure (high vacuum) in steam engines is

A. Desirable

B. Economical

C. Essential

D. Uneconomical

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Desecration of feed water is carried out because it reduces

A. Cavitation of boiler feed pumps

B. Corrosion caused by oxygen

C. Heat transfer coefficient

D. pH value of water

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4

When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as

A. Throttle governing

B. Cut-off governing

C. By-pass governing

D. None of these

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4

Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

A. Higher effectiveness of boiler

B. High calorific value coal being burnt

C. Fouling of heat transfer surfaces

D. Raising of steam temperature

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Caking coals are those which

A. Form lumps or masses of coke

B. Burn freely

C. Show little or no fusing action

D. Burn completely

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The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure.

A. Equal to

B. Less than

C. Higher than

D. None of these

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In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure.

A. Equal to

B. Lower than

C. Higher than

D. None of these

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When the nozzle operates with the maximum mass flow, the nozzle is said to be

A. Choked

B. Under-damping

C. Over-damping

D. None of these

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4

Thermal efficiency of well maintained boiler will be of the order

A. 40 %

B. 50 %

C. 75 %

D. 90 %

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4

In a uniflow engine

A. Steam enters and exhausts through the same port

B. Steam enters at one end and exhausts at the centre

C. Steam enters at the centre and exhausts at the other end

D. None of the above

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4

In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

A. 56 %

B. 63 %

C. 74 %

D. 78 %

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4

In an impulse turbine, steam expands

A. Wholly in blades

B. Wholly in nozzle

C. Partly in the nozzle and partly in blades

D. None of these

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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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When steam after doing work in the cylinder passes into a condenser, the engine is said to be a

A. Slow speed engine

B. Vertical steam engine

C. Condensing steam engine

D. Non-condensing steam engine

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A closed vessel made of steel and used for the generation of steam is called a

A. Steam boiler

B. Steam turbine

C. Steam condenser

D. Steam injector

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In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of

A. 10 atmospheres

B. 20 atmospheres

C. 30 atmospheres

D. 40 atmospheres

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4

A safety valve usually employed with stationary boilers is

A. Lever safety valve

B. Dead weight safety valve

C. High steam and low water safety valve

D. All of these

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4

An air preheater is installed

A. Before the economiser

B. Before the superheater

C. Between the economiser and chimney

D. None of these

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4

The saturation temperature of steam with increase in pressure increases

A. Linearly

B. Rapidly first and then slowly

C. Slowly first and then rapidly

D. Inversely

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4

Hard coke is used in

A. Cement industry

B. Thermal power plant

C. Blast furnace

D. Domestic use

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The function of a piston in a steam engine is

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

B. To transfer motion from the piston to the crosshead

C. To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

D. None of these