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ESE 2021 ME Technical Quiz || Performance Parameters of IC Engine

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Question 1

A 4 cylinder - 4 stroke petrol engine coupled to hydraulic dynamometer at constant speed of 2500 rpm and the following readings are obtained:
B.P. with all cylinders operating = 20.5 kW
B.P. with cylinders no. 1 is cut out = 15.2 kW
B.P. with cylinders no. 2 is cut out = 15.5 kW
B.P. with cylinders no. 3 is cut out = 14.8 kW
B.P. with cylinders no. 4 is cut out = 15.3 kW
Diameter of cylinder = 0.12 m
Stroke of piston = 0.15 m
The indicated mean effective pressure (imep) (in MPa) is

Question 2

Air enters a diesel engine with a density of 1.0 kg/m3. The compression ratio is 21. At steady state, the air intake is 30×10–3 kg/s and the net work output is 15 kW. The mean effective pressure (in kPa) is _________.

Question 3

The Swept volume for an Otto cycle is 4 litre and mean effective pressure is 1MPa. If the engine is operated as a 4 stroke cycle engine at 3000 rpm, then what will be the power output _______?

Question 4

An air standard two stroke Otto-cycle has stroke to bore ratio of 1.4 and volumetric efficiency 80%, then what will be the actual volume of air supplied to the engine in m3/min, if bore of the engine is 10 cm and engine running at a speed of 400 rpm.

Question 5

The mechanical efficiency of a single-cylinder four stroke engine is 75%. The frictional power is estimated to be 40 kW. Calculate the brake power  _________.
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Apr 29ESE & GATE ME