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4

A device used to increase the temperature of saturated steam without raising its pressure, is called

A. Blow off cock

B. Fusible plug

C. Superheater

D. Stop valve

Correct Answer :

C. Superheater


Related Questions

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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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4

Which device is used in thermal power plants to reduce level of pollution?

A. Induced draft fan

B. Smoke meter

C. Chimney

D. Precipitator

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4

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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4

The numbers of fire tubes in a Cochran boiler are

A. 75

B. 115

C. 165

D. 225

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4

The maximum efficiency of a reaction turbine is

A. 2 sin²α/(1 + sin²α)

B. 2 cos²α/(1 + cos²α)

C. (1 + sin²α)/2 sin²α

D. (1 + cos²α)/2 cos²α

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4

The high steam and low water safety valve is used to blow off steam when the

A. Steam pressure exceeds the working pressure

B. Water level in the boiler becomes too low

C. Both (A) and (B)

D. None of the above

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4

The shell of the Cochran boiler is made hemispherical

A. To give maximum space and strength

B. To withstand the pressure of steam inside the boiler

C. Both (A) and (B)

D. None of the above

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4

In a nozzle, whole frictional loss is assumed to occur between

A. Inlet and throat

B. Inlet and outlet

C. Throat and exit

D. All of these

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4

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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4

The nozzle efficiency is the ratio of

A. Workdone on the blades to the energy supplied to the blades

B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

C. Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

D. None of the above

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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

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

The efficiency of steam turbines may be improved by

A. Reheating of steam

B. Regenerative feed heating

C. Binary vapour plant

D. Any one of these

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4

A stage, in reaction turbine, is represented by

A. Number of casing

B. Number of entries of steam

C. Number of exits of steam

D. Each row of blades

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4

A boiler in India should conform to safety regulations of

A. DIN

B. BS

C. ASTM

D. IBR

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4

The artificial draught is produced by

A. Steam jet

B. Centrifugal fan

C. Chimney

D. Both (A) and (B)

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4

Feed water conditioning in thermal power plants in done to

A. Reduce hardness and for removal of solids

B. Increase efficiency of thermal power plant

C. Increase heat transfer rate

D. Increase steam parameters

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4

Which of the following statement is wrong?

A. Locomotive boiler is a water tube boiler

B. Water tube boilers are internally fired

C. Lamont boiler is a low pressure water tube boiler

D. All of the above

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4

With increase in load, radiant superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

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4

For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

A. One-half the height of chimney

B. Equal to the height of chimney

C. Two times the height of chimney

D. Four times the height of chimney

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4

Which of the following statement is correct?

A. The efficiency of steam turbines is greater than steam engines

B. A flywheel is a must for steam turbine

C. The turbine blades do not change the direction of steam issuing from the nozzle

D. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades

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4

In forced recirculation 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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4

The amount of water evaporated from feed water at _________ into dry and saturated steam at 100° C at normal atmospheric pressure is called equivalent evaporation from and at 100° C.

A. 0°C

B. 40°C

C. 60°C

D. 100°C

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4

The balanced draft furnace is one using

A. Induced draft fan and chimney

B. Induced draft fan and forced draft fan

C. Forced draft fan and chimney

D. Any one of the above

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4

When the inlet pressure of steam is equal to the exit pressure, then

A. There is a pressure drop in the nozzle

B. Fluid flows through the nozzle

C. Pressure drops and fluid flows through the nozzle

D. There is no pressure drop and fluid does not flow through the nozzle

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4

The indicated thermal efficiency is defined as the

A. Ratio of thermal efficiency to the 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

The working pressure range for a LaMont boiler is

A. 0.5 to 10 MN/m²

B. 1 to 15 MN/m²

C. 2.5 to 15 MN/m²

D. 3.5 to 20 MN/m²

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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

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

The value of the reheat factor varies from

A. 1.02 to 1.06

B. 1.08 to 1.10

C. 1.2 to 1.6

D. 1.6 to 2