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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

Correct Answer :

D. 0.067 bar


Related Questions

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4

Heating wet steam at constant temperature is heating it at constant

A. Volume

B. Pressure

C. Entropy

D. Enthalpy

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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

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

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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4

The specific heat of superheated steam in kcal/kg is generally of the order of

A. 0.1

B. 0.3

C. 0.5

D. 0.8

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4

Evaporative capacity of boiler is expressed as

A. kg of steam produced

B. Steam pressure produced

C. kg of fuel fired

D. kg of steam produced per kg of fuel fifed

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4

Pulverised fuel is used for

A. Better burning

B. More calorific value

C. Less radiation loss

D. Medium sized units

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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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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

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 safety valve at superheater as compared to drum safety valve setting is set at

A. Higher value

B. Lower value

C. Same value

D. Any value

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4

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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4

The Parsons' reaction turbine has

A. Only moving blades

B. Only fixed blades

C. Identical fixed and moving blades

D. Fixed and moving blades of different shape

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4

Fire tube boilers are limited to a maximum design working pressure of

A. 1 kg/cm

B. 6 kg/cm

C. 17 kg/cm²

D. 100 kg/cm²

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4

The condition of steam in boiler drum is always

A. Dry

B. Wet

C. Saturated

D. Supersaturated

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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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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

When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.

A. Increases

B. Decreases

C. Remain same

D. None of these

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4

The aim of a compound steam engine is

A. To reduce the ratio of expansion in each cylinder

B. To reduce the length of stroke

C. To reduce the temperature range in each cylinder

D. All of the above

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4

The fire tubes in a Scotch marine boiler are

A. Horizontal

B. Vertical

C. Inclined

D. None of these

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4

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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4

Fire tube boilers are

A. Internally fired

B. Externally fired

C. Internally as well as externally fired

D. None of these

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4

The pressure of reheat steam after passing through reheater compared to inlet condition is

A. More

B. Less

C. Equal

D. May be more or less depending on capacity of reheater

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4

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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4

The selection of type and size of a steam boiler depends upon

A. The power required and working pressure

B. The geographical position of the power house

C. The fuel and water available

D. All 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 a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.

A. Equal to

B. Less than

C. More than

D. None of these

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4

A safety valve in a locomotive starts leaking. The leaking medium will be

A. Water

B. Dry steam

C. Wet steam

D. Super heated steam

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4

The steam enters the nozzle at a

A. High pressure and a low velocity

B. High pressure and a high velocity

C. Low pressure and a low velocity

D. Low pressure and a high velocity

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4

In water tube boilers

A. Water passes through the tubes which are surrounded by flames and hot gases

B. The flames and hot gases pass through the tubes which are surrounded by water

C. Forced circulation takes place

D. None of these