The latent heat of steam with increase of pressure

Question

The latent heat of steam with increase of pressure

A. Remain same

B. Increases

C. Decreases

D. Behaves unpredictably

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A fusible plug is fitted in small boilers in order to

A. Avoid excessive build up of pressure

B. Avoid explosion

C. Extinguish fire if water level in the boiler falls below alarming limit

D. Control steam dome

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The coal requirement per kW hour generation in the thermal power plant is of the order of

A. 0.1 to 0.2 kg

B. 0.2 to 0.4 kg

C. 0.6 to 0.8 kg

D. 1.0 to 1.5 kg

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In order to reduce the rotor speed of an impulse turbine, the method employed is

A. Velocity compounding

B. Pressure compounding

C. Pressure-velocity compounding

D. All of these

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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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The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by

A. V = 2g H'

B. V = 2g/H'

C. V = H'/2g

D. V = 2gH'

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A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

A. Blow off cock

B. Fusible plug

C. Stop valve

D. Safety valve

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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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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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The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is

A. Less

B. More

C. Equal

D. May be less or more depending on temperature

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Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

A. 421 kg.m

B. 421 kg.m

C. 539 kg.m

D. 102 kg.m

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The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop

A. Remains the same

B. Increases

C. Decreases

D. Is unpredictable

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Thermal efficiency of well maintained boiler will be of the order

A. 40 %

B. 50 %

C. 75 %

D. 90 %

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The radius of a dished head is taken approximately as

A. One fourth

B. Half

C. One

D. Two

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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

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The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and h_d = Enthalpy or heat drop during expansion of steam in a nozzle)

A. V = 44.72 h_d K

B. V = 44.72 K h_d

C. V = 44.72 K h_d

D. V = 44.72 K h_d

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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 device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called

A. Safety valve

B. Water level indicator

C. Pressure gauge

D. Fusible plug

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The function of a flywheel is

A. To convert reciprocating motion of the piston into rotary motion

B. To convert rotary motion of the crankshaft into to and fro motion of the valve rod

C. To prevent fluctuation of speed

D. To keep the engine speed uniform at all load conditions

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The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

A. Feed pump

B. Injector

C. Feed check valve

D. Pressure gauge

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The artificial draught is produced by

A. Steam jet

B. Centrifugal fan

C. Chimney

D. Both (A) and (B)

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Size of boiler tubes is specified by

A. Mean diameter and thickness

B. Inside diameter and thickness

C. Outside diameter and thickness

D. Outside diameter and inside diameter

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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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The velocity of whirl at outlet for an axial discharge turbine is

A. Minimum

B. Maximum

C. Zero

D. None of these

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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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In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is

A. Low

B. Very low

C. High

D. Very high

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The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called

A. Induced steam jet draught

B. Chimney draught

C. Forced steam jet draught

D. None of these

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An economiser is installed in a boiler primarily to

A. Superheat the steam

B. Reduce fuel consumption

C. Increase steam pressure

D. All of these

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There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

A. Wet steam

B. Saturated steam

C. Superheated steam

D. Cushion steam

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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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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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Accepted Answer

C. Decreases

The latent heat of steam with increase of pressure

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

A fusible plug is fitted in small boilers in order to

The coal requirement per kW hour generation in the thermal power plant is of the order of

In order to reduce the rotor speed of an impulse turbine, the method employed is

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

The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by

A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

The actual vacuum in a condenser is equal to

The number of drums in Benson steam generator is

The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is

Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop

Thermal efficiency of well maintained boiler will be of the order

The radius of a dished head is taken approximately as

Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and h_d = Enthalpy or heat drop during expansion of steam in a nozzle)

The maximum heat loss is a boiler occurs due to

The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called

The function of a flywheel is

The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

The artificial draught is produced by

Size of boiler tubes is specified by

The pressure at which latent heat of vaporisation of water is zero, is

The velocity of whirl at outlet for an axial discharge turbine is

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

In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is

The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called

An economiser is installed in a boiler primarily to

There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

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

The state of vapour under saturation condition is described by

Also checkout

The latent heat of steam with increase of pressure

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

A fusible plug is fitted in small boilers in order to

The coal requirement per kW hour generation in the thermal power plant is of the order of

In order to reduce the rotor speed of an impulse turbine, the method employed is

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

The velocity of flue gases (V) through the chimney under a static draught of (H') metres is given by

A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

The actual vacuum in a condenser is equal to

The number of drums in Benson steam generator is

The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is

Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop

Thermal efficiency of well maintained boiler will be of the order

The radius of a dished head is taken approximately as

Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will

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)

The maximum heat loss is a boiler occurs due to

The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called

The function of a flywheel is

The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as

The artificial draught is produced by

Size of boiler tubes is specified by

The pressure at which latent heat of vaporisation of water is zero, is

The velocity of whirl at outlet for an axial discharge turbine is

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

In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is

The draught produced by a steam jet issuing from a nozzle placed in the ash-pit under the fire grate of the furnace is called

An economiser is installed in a boiler primarily to

There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

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

The state of vapour under saturation condition is described by

Also checkout

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and h_d = Enthalpy or heat drop during expansion of steam in a nozzle)