Steam & Related Questions (Mechanical Engineering) 12 Online Test

The efficiency of a rankine cycle lies in the range
10-20%
20-30%
30-40%
40-50%
Neglecting pump work, the rankine thermal efficiency in given by




Where H1 and H2 are the enthalpies of steam at entry to and exit from the turbine, and h2 is the asensible heat corresponding to condenser pressure
Consider the following processes constant pressure heat addition adiabatic compression adiabatic expansion constant pressure heat addition The correct sequence of these processes in ranking cycle is
1, 2, 3, 4
2, 1, 4, 3
2, 1, 3, 4
1, 3, 4, 3
Which of the following processes is not involved in a rankine cycle?
Isobaric
Isothermal
Isochoric
Adiabatic
The expansion of steam in a rankine cycle is assumed to be
Polytropic
Hyperbolic
Adiabatic
Isothermal
A thermodynamic cycle used for steam engines is
Carnot cycle
Rankine cycle
Bell-coleman cycle
Ericsson cycle
Fusible plug for a steam boiler is an alloy consisting of bismuth, lead and
Zinc
Tin
Copper
Aluminium
During which of the following process does heat rejection take place in carnot vapour cycle?
Constant volume
Constant pressure
Constant temperature
Constant entropy
Which one of the following safety devices is used to protect the boiler when the water level falls below a minimum level?
Water level indicator
Fusible plug
Blow off cock
Safety valve
Fans used for mechanical draft (induced ) are of ……….type
Axial flow
Radical flow
Centrifugal
Propeller
Fusible plug is fitted in a boiler to
Prevent leakage of steam from boiler
Keep the boiler pressure within prescribed limits
Extinguish the fire in case of low water level
Allow passage of only superheated steam from the boiler
At a certain pressure, specific volume of dry saturated steam is 0.20m3/kg. The volume of half kg of 0.5 dry steam at this pressure will be
0.05 m3
0.1 m3
0.4 m3
0.8 m3
The function of precipitator in a boiler is to
Control the water particles going along with steam
Minimize the ash particles in flue gases escaping through chimney
Control the rate of combustion of fuel
Check the chemical impurities in feed water
The advantage/advantages of using air preheater is/are
Low grade and inferior fuel can be used
Better combustion with less soot smoke and ash
Increase in evaporative rate
Gain in boiler efficiency
All of the above
By the use of an economizer, saving in fuel consumption is about
5-10%
10-15%
15-20%
20-25%
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.

Discussion

Sudheer Naidu N

during which of the following processes does heat rejection takes place in carnot vapour cycles

1914 days 31 minutes ago

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