Out of the following diesel engine the minimum air consumption per B.H.P. will be in
A.4 stroke, mech, injection
B.4 stroke, air injection
C.2 stroke, mech, injection, pump, scavenging
D.2 stroke, air injection
Category: Heat Engines Mcqs
A plant costing Rs. 80,000 has a useful life of 12 years. The amount that should be saved annually to replace the equipment at the end of useful life with salvage value of Rs. 8,000 should be
A.Rs. 5000
B.Rs. 6000
C.Rs. 8000
D.Rs. 10000
E.Rs. 15000
The mean effective pressure of a diesel cycle having fixed compression ratio will increase if cut off ratio will
A.Increase
B.Decrease
C.Independent of CR
D.Depends on other factors
E.None of the above
The pressure of steam generated in a boiler as recorded by the Bourdon pressure gauge was 2.2 kg/sq-cm. If the barometer reads 774 mm of mercury the absolute pressure of steam would be
A.0.2 kg/sq-cm
B.9.774 kg/sq-cm
C.77.4 mm of Hg
D.3.2526 kg/sq-cm
E.1.025 kg/sq-cm
Change in internal energy is least during
A.Constant volume process
B.Constant pressure process
C.Isothermal process
D.Adiabatic process
For steam engine having a throttle governor, a straight line is obtained when the total weight of steam used per hour is plotted against the indicated horse power. This line is known as
A.Clapeyron’s line
B.Calender’s line
C.Willian’s line
D.Hopson’s line
E.Bunsen line
In spark ignition engines the knocking tendency decreases
A.As compression ratio is reduced
B.By controlling air/fuel mixture
C.By controlling ignition timing
D.By controlling exhaust temperatures
E.None of the above
The total length of 40 mid-ordinates on a simple steam engine indicator diagram is 17 cm. The pressure scale is 0.6 kg/sq-cm. The mean effective pressure would be
A.1.0 kg/sq-cm
B.1.7 kg/sq-cm
C.1.0 kg/sq-cm
D.10.2 kg/sq-cm
E.None of the above
If a water cooled compressor knocks during operation, the probable cause cannot be
A.Loose flywheel or pulley
B.Too much clearance in crank pin
C.Loose valve
D.Excess cooling in intercooler
E.Air filter choked
In a system if base load is same as maximum demand, the load factor will be
A.1
B.Zero
C.Infinity
D.1 percent
E.0.5 percent
