| Page 17 | Mechanical Engg Diploma Notes and Videos

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Turbocharging and supercharging

Basics of I C Engine

Q.1. Explain working of Four Stroke SI(Petrol) Engine

1. Suction stroke:- During this stroke the crank moves from TDC to BDC. The piston moves downward. inlet valve is open and exhaust valve is closed. The charge is sucked into cylinder. Stroke continues till piston reaches BDC ,as shown in fig

Power Cycles

Power cycles basics

The device which produces net power output is called an ENGINE. The thermodynamic cycles on which the engines work are called POWER CYCLES.

DEFINITION OF MANAGEMENT

Management may be defined in many different ways. Many eminent authors on the subject have defined the term "management", some of these definitions are reproduced below:

According to Lawrence A Appley - "Management is the development of people and not the direction of things".

Introduction to management

Management is a vital aspect of the economic life of man, which is an organised group activity. A central directing and controlling agency is indispensable for a business concern. The productive resources – material, labour, capital etc. are entrusted to the organising skill, administrative ability and enterprising initiative of the management. Thus, management provides leadership to a business enterprise. Without able managers and effective managerial leadership the resources of production remain merely resources and never become production.

Q.22. Explain with sketch Elliptical Trammel Mechanism?

Links:

1. Frame

2.PB

Q.21. Explain with sketch Oldham’s Coupling

Links: Frame (fixed) :1

Shaft & Flange on left hand :2

Shaft & Flange on right hand :4

Q.20. Explain with sketch Scotch Yoke Mechanism?

Links: 1.Frame (fixed )

2.Crank

3.Slider

4. Yoke

Pairs -

Q.19. Draw Basic double slider crank chain and explain how different inversions are obtained from it?

Q.18. Explain with sketch Whitworth’s quick return Mechanism?

Links: Crank BC

Slotted lever EAD

Slider

Frame AB (FIXED)

Explain the effect of superheating and subcooling on the performance of vapour compression cycle......

Effect of superheating: As shown in the figure a & b the effect of superheating is to increase the refrigerating effect, but this increase in the refrigerating effect is at the cost of increase in amount of work spent to attain upper pressure limit. Since the increase in work is more as compared to increase in refrigerating effect, therefore overall effect of superheating is to give a low value of C.O.P.

Differentiate between closed cycle and open cycle gas turbine

Explain with neat sketch two way catalytic converter.

C) Catalytic Convertor: -. A catalytic converter is cylindrical unit about the size of small silencer and is installed into exhaust system of vehicle. It converts the harmful gases from the engine into harmless gases and escapes them into atmosphere. Inside converter there is honeycomb structure of ceramic or metal which is coated with alumina base material and therefore a second coating of precious metal platinum, palladium or rhodium or combination of same.