Indian Engineering Service Mechanical Engineering previous year question papers

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Will you please provide me the previous year question papers of Mechanical Engineering of Indian Engineering Service IES exam?

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IES Mechanical Engineering question paper

PAPER–I

1.

(a) A reversible heat engine operates between 600 C and 40 C and drives a reversible refrigerator operating between 40C and -18 C. Still there is a net output of work equal to 370 Id, while
the heat received by the engine is 2100 U. Determine the cooling effect.

(b) A compressor takes in 500 kg/mm of air at 0.98 bar and 18 C and delivers it at 5.5 bar and 68 C. The diameters of inlet and delivery pipes are respectively 450 mm and 200 mm. The
power input is 1000 kW. Determine the rate and direction heat flow. (Cv = 1.005 Id/kg C).

2. A reversible cycle using an ideal gas as the working substance consists of a isentropic compression from and initial temperature to 555°K, a constant volume process from 555° to 835°K, a reversible adiabatic expansion to 555°K, a constant pressure expansion from 555°K to 835°K followed by a
constant volume process to the initial temperature. Draw the cycle on p-v and the T.S. diagrams and
determine the initial temperature, (y = 1.40). Also compute the work done.

3. A 6-cylinder, four-stroke cycle, 10 cm × 12.5 cm stroke, diesel engine develops 50 kW at 1000
r.p.m. The various efficiencies are mechanical 76%; volumetric 80% under room conditions;
indicated relative 88%; theoretical thermal 52%. The lower calorific value of the liquid fuel is 45000
Id. Compute (a) b.m.e.p.; (b) air fuel ratio; (c) specific fuel consumption. Assume air density as 0.12
kg/m2 under room conditions.

4. The nozzles of de Laval turbine deliver steam at the rate of 900 gm/sec with a velocity of 730 m/sec
to a set of blades revolving at the rate of 30000 r.p.m. The diameter of the wheelies 11.5 cm. The
nozzles are inclined at an angle of 20° to the plane of wheel rotation.
Calculate the (a) diagram efficiency; (b) power developed by the blades; (c) energy lost in the blades
per sec. Assume the blade velocity coefficient as 0.72 and outlet blade angle 25°. (d) Also determine
the condition for the maximum efficiency of the turbine. Discuss the physical significance of
diagram efficiency.

5. Water is drawn from a river at 7°C arid has to be heated to 64°C. Calculate the advantage of using
the heat pump plant described below over direct heating of the water. The water drawn from the river
passes first through the Freon condenser and then through the steam condenser. Assume that a heat
source above 450°C is available.
Freon-12 Heat Pump compressor is driven by stream turbine. Its condenser temperature 60°C
and evaporator temperature -5°C. Freon-12enters compressor as saturated vapour and enters throttle
value as saturated liquid.
Steam pressure and temperature leaving boiler 30 kg/cm2 and 450°C respectively. Steam condenser
temperature 76°C. Enthalpy values of Freon- 12: At entry to compressor 187 KJ/kg, at discharge of compressor 221.5
kJ/kg and at exit condenser 90 kJ/kg. (4°18 kJ = 1 kcal),

IES Mechanical Engineering question paper

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