Steam & Related Questions (Mechanical Engineering) 11 Online Test

The fusible plug is placed
Near the manhole
Just below the water level indicator
At the crown of furnace
At the fire grate of boiler
Choose the false statement
Water is a pure substance and it retains its chemical identity under all conditions
A perfect gas does not undergo a change of phase during a thermodynamic process
Vapour behaves like a perfect gas and obeys gas laws
Vapour is a mixed phase of liquid and gas
Critical temperature for steam is
313oC
347oC
375oC
409oC
Consider the following statements: The efficiency of the vapour power rankine cycle can be increased by increasing the temperature of the working fluid at which heat is added increasing the pressure of the working fluid at which heat is added decreasing the temperature of the working fluid at which heat is rejected Which of these statements is/are correct?
2 and 3
1 alone
1 and 2
1, 2 and 3
The function of blow off cock in a boiler is to
Blow air into the furnace
Remove sludge from the boiler
Allow flue gases to escape to the chimney
Drain off water resulting from partial condensation of steam
Critical pressure for steam is
252 bar
225 bar
184 bar
163 bar
Which of the following is fitted in the lowest part of the boiler for periodic cleaning and inspection
Feed check valve
Sliding valve
Blow off cock
Manhole
At critical pressure
Entropy is zero
Latent heat of vaporization is zero
Saturated vapour becomes a gas
Sublimation occurs from solid to vapour phase
Identify the valve that prevents any water (after being pumped) rushing back from the boiler
Blow off cock
Steam stop valve
Feed check valve
Steam trap
Which of the following is not a correct statement?
There is no change in temperature when a liquid is being evaporated into vapour
Vapour is a mixed phase of liquid and gas in the zone between saturated liquid line and dry saturated vapour line
The saturated dry vapour curve is steeper as compared to saturated liquid curve
The horizontal distance liquid and vapour lines becomes less and less with increase in pressure
The flow of steam from the boiler to the main pipe and to shut off the steam completely when not required is done through
Steam stop valve
Blow off cock
Steam trap
Safety valve
Sensible heat
Does not allow rise in temperature
Results in temperature rise that can be sensed by a thermometer
Brings about a charge in the state of the substance
Is absorbed by a liquid at saturation temperature to get converted into vapour at the same temperature.
What is the function of steam trap?
To arrest water particles going along with steam
To drain off water resulting from partial condensation of steam in pipes
To prevent steam from leaking out from the boiler
To regulate the steam flow rate from the boiler
The heat absorbed by water at its saturation temperature to get converted into dry steam at the same temperature is called
Sensible heat
Specific heat
Latent heat
Total heat
The device which comes into operation when the pressure in the boiler exceeds the working pressure is called
Safety valve
Fusible plug
Steam stop valve
Blow off cock
Description:

This is a 15-question test on ‘Steam: Generation, Engines and Turbines’ under a series of tests of Mechanical Engineering which is attributed to Competitive Examination Preparations e.g. IAS (Optional), GATE, IES etc.

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sandip

i've got 15 out of 15 :-)

4106 days 3 hours 47 minutes ago

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