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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

Correct Answer :

B. Flash i.e. get converted into steam


Related Questions

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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 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 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

Over fire burning is the phenomenon of

A. Supply of excess, air

B. Supply of excess coal

C. Burning CO and unburnts in upper zone of furnace by supplying more air

D. Fuel bed firing

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4

De-Laval turbines are mostly used

A. Where low speeds are required

B. For small power purposes and low speeds

C. For large power purposes

D. For small power purposes and high speeds

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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

Efficiency of Rankine cycle can be increased by

A. Decreasing initial steam pressure and temperature

B. Increasing exhaust pressure

C. Decreasing exhausts pressure

D. Increasing the expansion ratio

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4

An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.

A. Equal

B. Less

C. More

D. None of these

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4

The function of injector used in small steam plants is to

A. Create vacuum in furnace

B. Create vacuum at turbine exhaust

C. Pump feed water

D. Dose chemicals in feed water

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4

An economiser in a boiler

A. Increases steam pressure

B. Increases steam flow

C. Decreases fuel consumption

D. Decreases steam pressure

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4

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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4

The proximate analysis of fuel lists

A. Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

B. Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight

C. Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

D. Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

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4

The efficiency of a boiler is defined as

A. Ratio of heat actually used in producing steam to the heat liberated in the furnace

B. Ratio of the mass of steam produced to the mass of total water supplied in a given time

C. Ratio of the heat liberated in the furnace to the heat actually used in producing steam

D. None of the above

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4

In a receiver 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

The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

A. More

B. Less

C. Same

D. Could be more or less depending on other factors

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4

If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to

A. ps - pa

B. pa - ps

C. pa + ps

D. None of these

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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

The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.

A. Same

B. Less

C. More

D. None of these

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4

Boiler parameters are expressed by

A. Tonnes/hr. of steam

B. Pressure of steam in kg/cm²

C. Temperature of steam in °C

D. All of the above

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4

The power of a boiler may be defined as

A. The ratio of heat actually used in producing the steam to the heat liberated in the furnace

B. The amount of water evaporated or steam produced in kg per kg of fuel burnt

C. The amount of water evaporated from and at 100° C into dry and saturated steam

D. The evaporation of 15.653 kg of water per hour from and at 100° C

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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

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4

The critical pressure ratio for gases is

A. 0.528

B. 0.546

C. 0.577

D. 0.582

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4

The actual vacuum in a condenser is equal to

A. Barometric pressure + actual pressure

B. Barometric pressure - actual pressure

C. Gauge pressure + atmospheric pressure

D. Gauge pressure - atmospheric pressure

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4

On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by

A. Horizontal straight line

B. Vertical straight line

C. Straight inclined line

D. Curved line

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4

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

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4

Willians line follows the law (where b = A constant representing the shape of the Willians line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

A. I.P. = a × m + b

B. m = a + b × I.P.

C. I.P. = b × m + a

D. m = (b/I.P.) - a

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4

Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

A. Former occupies less space for same power

B. Rate of steam flow is more in former case

C. Former is used for high installed capacity

D. Chances of explosion are less in former case.

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4

On Mollier chart, flow through turbine is represented by

A. Horizontal straight line

B. Vertical straight line

C. Straight inclined line

D. Curved line

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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

The diameter of Cornish boiler is of the order of

A. 12 m

B. 1.52.5 m

C. 23 m

D. 2.53.5 m