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Engineering :: Heat Engines


341.  Dehydration is the process of removal of
A. hydrogen from water B. hydrogen from alcohols
C. hydrogen from hydrocarbon D. moisture from anything that is wet
E. addition of water vapour to a substance    

342.  If a heat engine given an output of 3.5 kW and input is 10000 Joules per second, the thermal efficiency of the engine will be
A. 30% B. 35%
C. 55% D. 65%
E. 66?%    

343.  Water gas is a mixture of
A. CO and H2 B. N2 and H2
C. CO2 and N2 D. CO, CO2 and SO2
E. SO2, CO2 and N2    

344.  The steam in a boiler drum is always
A. Wet B. Dry
C. Dry and saturated D. Wet or dry and saturated
E. Superheated    

345.  A fuel of octane rating 85 matches the antiknock qualities of mixture consisting of
A. 85% petrol + 15% diesel B. 15% petrol + 85% diesel
C. 85% benzene + 15% methyl alcohol D. 85% heptane + 15% octane
E. 85% octane + 15% heptane    

346.  The missing quantity in a steam engine can be reduced by all of the following methods EXCEPT:
A. Steam jacketing of cylinder walls B. Reducing the speed of the engine
C. Superheating the steam supplied to the engine D. Dompounding the expansion of steam in two or more cylinders

347.  Within the boiler the temperature of steam is highest in
A. Water drum B. water tubes
C. Water walls D. Superheater inlet
E. Superheater outlet    

348.  The intercept of Willian's line on Y-axis at the origin, gives
A. Missing quantity B. Frictional horse power
C. No load steam consumption D. Idling speed
E. All of the above    

349.  During throttle governing of steam engines
A. Cut off of the engine cylinder changes according to the load B. Pressure of steam supplied does not change with the load
C. Thermal efficiency of the engine reduces D. Mechanical efficiency of the engine increases
E. None of the above    

350.  Clapeyron equation is applicable
A. To systems in equilibrium B. To change of boiling point
C. To change of melting point D. For change of state when two phases are in equilibrium
E. All of the above    




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