Programme Code : PGDGM
Course Code : Theory Of Machines
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Year : 2014 Views: 693 Submitted By : Mangal Singh On 03rd June, 2014

Do you have solution for this Question. If yes    I aslo want solution.

Q.




Q1 (a) Explain the following:

1. Inversion of mechanisms.

2. The principles and applications of the inversions of the slider-crank

chain.

(b) What is Coriolis component of acceleration? Derive an expression for

evaluating it and explain how the directions are fixed.



Q2 (a) What are the uses of Pantograph? Describe the principle and working of

a pantograph?

(b) Explain the following:

1. Working of a railway vacuum brake

2. Differentiate between absorption and transmission dynamometers

and give the constructional and operational details of any one of

absorption dynamometer?



Q3 (a) Distinguish between the functions of a cam and an eccentric. What are

the considerations that govern the choice of profile of a cam? To what

extent can these consideration be satisfied?

(b) State the different types of governors? What is the difference between

centrifugal and inertia type governors. Why is the former preferred to

the later?



Q4 (a) Differentiate between the functions of a flywheel and a governor. In a

diesel generating set, is it possible to use only a flywheel or a governor?

Give your answer with justifications?

(b) Explain the terms (a) variation in tractive effort, (b) swaying couple and

(c) hammer blow as applied to locomotive balancing. Derive expressions for

these for a two-cylinder locomotive having cranks 90 degree apart?



Q5 An aeroplane makes a complete half circle of 60m radius towards left

when flying at 250km/hr. The rotary engine and the propeller of the

plane has a mass of 450kg with a radius of gyration of 300mm. The at

engine runs 2400rpm clockwise when viewed from the rear. Find the

gyroscopic effect on the aircraft?



Q6 Two shafts are to be joined by a Hooke coupling. The driving shaft rotates

at a uniform speed of 600rpm and the speed of the driven shaft must lie

between 500 and 550 rpm. Determine the maximum permissible angle

between the shafts?

 


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