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WorksheetsTesting of IC Engines
Total questions: 20
Worksheet time: 38mins
An engine cylinder has 150 mm of bore and 225 mm of stroke. If the clearance volume is 1.25 x 10-3 m3, the compression ratio will be (a)
Specific fuel consumption is
fuel consumed per kWh of power produced
the ratio of mass flow rate of fuel and brake power
the ratio of total fuel consumption and indicated power
the ratio of total fuel consumed and fuel power
Which of the following suits an IC engine supercharger?
It uses power from the exhaust gas for compression
It uses an additional compressor/blower to compress the air taken in
It uses an additional turbine to increase the power output
none of the above
What is the primary function of a supercharger in an IC engine?
To increase the air intake pressure
To reduce fuel consumption
To cool the engine components
To enhance the exhaust flow
How does a supercharger affect the power output of an engine?
It decreases the power output
It only affects torque, not power
It has no effect on power output
It increases the power output
An IC engine works with 80% mechanical efficiency and 40% indicated thermal efficiency. Its brake thermal efficiency is
40%
20%
32%
12%
One cycle of operation in a four stroke IC engine is completed in (a) revolution/s of the crank
A 5 kW engine consumes 20% of its brake power to overcome friction. Its mechanical efficiency is
80%
83.3%
20%
85.6%
Volumetric efficiency of an IC engine is the ratio of
stroke volume to clearance volume
actual volume to clearance volume
clearance volume to stroke volume
actual volume to stroke volume
What is the primary purpose of the intercooler in a turbocharged engine?
To reduce the engine's weight
To enhance fuel atomization
To cool the compressed air before it enters the engine
To increase the temperature of the intake air
An 2 stroke engine develops a torque of 100 Nm at 3000 rpm. The brake power developed by the engine is (a) kW
A single cylinder two stroke engine develops an indicated mean effective pressure of 5 bar running at 1500 rpm. If the bore and stroke are 10 cm each, the indicated power developed by the engine is (a) kW
A 50 cc engine with stroke to bore ratio as 1 has a bore of (a) cm
The ratio of indicated thermal efficiency to air standard efficiency is
relative efficiency
volumetric efficiency
overall efficiency
mechanical efficiency
If an engine consumes fuel at the rate of 1 kg/h and if the air fuel ratio is 20, then the mass flow rate of exhaust gas is
20 kg/h
1 kg/h
21 kg/h
19 kg/h
Dynamometer is used to find the __________ of IC engine
speed or rpm
brake power
indicated power
friction power
A four cylinder engine develops 15 kW when all cylinders are working. When cylinder 1,2,3 and 4 are cut off successively, it develops brake power at rate of 10 kW, 10.1 kW, 10.2 kW and 10.3 kW. The frictional power of the engine is (a) kW
A 15 kW IC engine works with 30% brake thermal efficiency. if the calorific value of the fuel is 40,000 kJ/kg, its fuel consumption is _______________ kg/h
4
3
1.5
4.5
If the cooling water flow rate of an engine is 1 kg/s with a temperature rise of 20oC and specific heat capacity of water is 4.2 kJ/kg oC, heat lost to cooling water is ____________ kW
1 kW
80 kW
84 kW
20 kW
Indicated power of the engine can be increased by increasing
mean effective pressure
all of the above
bore
stroke
