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

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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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Hard coke is produced by carburisation of coal at

A. Atmospheric temperature

B. 500-600°C

C. 700-850°C

D. 950-1100°C

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The critical pressure ratio (p₂/p₁) is given by

A. (p₂/p₁) = [2/(n - 1)] ^{n/(n + 1)}

B. (p₂/p₁) = [2/(n + 1)] ^n/(n-1)

C. (p₂/p₁) = [(n - 1)/2] ^{n + (1/n)}

D. (p₂/p₁) = [(n + 1)/2] ^{n - (1/n)}

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Boiler stays are used to

A. Prevent flat surfaces under pressure from tearing apart

B. Take care of failure in shear

C. Take care of failure in compression

D. Provide support for boiler

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The flow through a nozzle is regarded as

A. Constant volume flow

B. Constant pressure flow

C. Isothermal flow

D. Isentropic flow

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

A. Divergent nozzle

B. Convergent nozzle

C. Convergent-divergent nozzle

D. None of these

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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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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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In a reaction turbine, when steam flows through the fixed blades,

A. Pressure increases while velocity decreases

B. Pressure decreases while velocity increases

C. Pressure and velocity both decreases

D. Pressure and velocity both increases

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In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

A. Water space also

B. Chimney

C. Steam space

D. Superheater

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Which is not correct statement about effect of sulphur in fuel?

A. It has heating value

B. It helps in electrostatic precipitation of ash in flue gases

C. It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

D. It erodes furnace walls

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In fire 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

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The efficiency of an impulse turbine is maximum when (where V_b = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

A. V_b = 0.5 V cosα

B. V_b = V cosα

C. V_b = 0.5 V² cosα

D. V_b = V² cosα

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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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The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become

A. Wet

B. Superheated

C. Remain dry saturated

D. Dry

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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 ratio of total useful heat drop to the total isentropic heat drop, is called

A. Stage efficiency

B. Internal efficiency

C. Rankine efficiency

D. None of these

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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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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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One kg of steam sample contains 0.8 kg dry steam; Its dryness fraction is

A. 0.2

B. 0.8

C. 1.0

D. 0.6

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A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

A. Blow off cock

B. Fusible plug

C. Superheater

D. Stop valve

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The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

A. More

B. Less

C. Same

D. None of these

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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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The ratio of the workdone on the blades to the energy supplied to the blades, is called

A. Blading efficiency

B. Nozzle efficiency

C. Gross or stage efficiency

D. Mechanical efficiency

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

A. CO₂

B. CO

C. O₂

D. N₂

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Hard coke is used in

A. Cement industry

B. Thermal power plant

C. Blast furnace

D. Domestic use

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The diameter of fire tubes in Cochran boiler is of the order of

A. 2 cm

B. 6 cm

C. 8 cm

D. 12 cm

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The relative heat absorption for successively added equal areas of boiler convection heating surfaces

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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The maximum steam pressure in a Locomotive boiler is limited to

A. 0.18 MN/m²

B. 1.8 MN/m²

C. 18 MN/m²

D. 180 MN/m²

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O₂ content in atmospheric air on weight basis is

A. 21 %

B. 23 %

C. 30 %

D. 40 %

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Incomplete combustion can be best judged by

A. Smoky chimney exit

B. Excess air in flue gases

C. Measuring carbon monoxide in flue gases

D. Measuring temperature of flue gases at exit of furnace

Discuss this answer

Accepted Answer

C. Higher than

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

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

Hard coke is produced by carburisation of coal at

The critical pressure ratio (p₂/p₁) is given by

Boiler stays are used to

The flow through a nozzle is regarded as

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

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

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

In a reaction turbine, when steam flows through the fixed blades,

In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

Which is not correct statement about effect of sulphur in fuel?

In fire tube boilers

The efficiency of an impulse turbine is maximum when (where V_b = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

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

The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become

The diameter of superheated tubes in a locomotive boiler is

The ratio of total useful heat drop to the total isentropic heat drop, is called

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

The action of steam in a steam turbine is

One kg of steam sample contains 0.8 kg dry steam; Its dryness fraction is

A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

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.

The ratio of the workdone on the blades to the energy supplied to the blades, is called

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

Hard coke is used in

The diameter of fire tubes in Cochran boiler is of the order of

The relative heat absorption for successively added equal areas of boiler convection heating surfaces

The maximum steam pressure in a Locomotive boiler is limited to

O₂ content in atmospheric air on weight basis is

Incomplete combustion can be best judged by

Also checkout

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

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

Hard coke is produced by carburisation of coal at

The critical pressure ratio (p₂/p₁) is given by

Boiler stays are used to

The flow through a nozzle is regarded as

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

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

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

In a reaction turbine, when steam flows through the fixed blades,

In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

Which is not correct statement about effect of sulphur in fuel?

In fire tube boilers

The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

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

The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become

The diameter of superheated tubes in a locomotive boiler is

The ratio of total useful heat drop to the total isentropic heat drop, is called

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

The action of steam in a steam turbine is

One kg of steam sample contains 0.8 kg dry steam; Its dryness fraction is

A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

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.

The ratio of the workdone on the blades to the energy supplied to the blades, is called

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

Hard coke is used in

The diameter of fire tubes in Cochran boiler is of the order of

The relative heat absorption for successively added equal areas of boiler convection heating surfaces

The maximum steam pressure in a Locomotive boiler is limited to

O₂ content in atmospheric air on weight basis is

Incomplete combustion can be best judged by

Also checkout

The efficiency of an impulse turbine is maximum when (where V_b = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)