⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs281
Heating wet steam at constant temperature is heating it at constant_________________?
Avolume
Bpressure
Centropy
Denthalpy E. none of the above
282
In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?
A40%
B25%
C50%
D80% E. 90%
283
At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?
Amaximum
Bminimum
Czero
Ddepends on temperature also E. none of the above
284
Latent heat of dry steam at atmospneric pressure is equal to____________________?
A539 kcal/kg
B539 BTU/lb
C427 kcal/kg
D100 kcal/kg E. 471 kcal/kg
285
In a throttling process_________________?
Aheat transfer takes place
Bwork is done by the expanding steam
Cinternal energy of steam changes
Dall of the above E. none of the above
286
The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become_______________?
Awet
Bsuperheated
Cremain dry saturated
Ddry E. none of the above
287
The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?
Awet
Bsuperheated
Cremain dry satruated
Ddry E. none of the above
288
On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________?
Ahorizontal straight line
Bvertical straight line
Cstraight inclined line
Dcurved line E. none of the above
289
A wet vapour can be completely specified by__________________?
Apressure only
Btemperature only
Cdryness fraction only
Dspecific volume only E. pressure and dryness fraction
290
The specific heat of superheated steam in kcal/kg is generally of the order of___________________?
A0.1
B0.3
C0.5
D0.8 E. 1.0