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F1040 Pages: 4

about an axis through the centre of mass is 148mm. The engine runs at 320 rpm.
Find the magnitude and the direction of the inertia forces and the corresponding
torque on the crankshaft when the angle turned by the crank is 140° from the
inner dead centre.

State and explain D’Alembert’s principle.

What do you mean by dynamic equivalent .system? Explain

PART 13
Answer any three full questions, each carries 10 marks.
A three cylinder single acting engine has its cranks set equally at 120° and it runs

at 600 r.p.m. The torque-crank angle diagram for each cycle is a triangle for the

power stroke with a maximum torque of 90 N-m at 60° from dead centre of

corresponding crank. The torque on the return stroke is sensibly zero. Determine

1. Power developed.

2. Coefficient of fluctuation of speed, if the mass of the flywheel is 12 kg and has
a radius of gyration of 80 mm

3. Coefficient of fluctuation of energy

4. Maximum angular acceleration of the flywheel.

The firing order of a 6 cylinder 4 stroke inline engine is 1-4-2-6-3-5.The stroke is

120mm and the length of each connecting rod is 240mm. The pitch distance

between the cylinders centrelines are 100mm each. The reciprocating mass per

cylinder is 1108 and the engine runs at 2400rpm. Determine the out-of-balance

primary and secondary forces and couples.

Find the angle of heel of a two-wheeler negotiating a turn of radius 60m.

Combined mass of the vehicle with the rider is 280kg, moment of inertia of

engine rotating parts is 0.4kgm?,taht of each road wheel is 1.2kgm/?, the overall

gear ratio is 4, height of C.G. is 0.6m with the rider, vehicle speed is 90km/h

A four wheeled motor car of mass 2000 kg has a wheel base 2.5 m, track width

1.5 m and height of centre of gravity 500 mm above the ground level and lies at 1

metre from the front axle. Each wheel has an effective diameter of 0.8 m and a

moment of inertia of 0.8 kg-m2. The drive shaft, engine flywheel and

transmission are rotating at 4 times the speed of road wheel, in a clockwise

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