# GTU Question papers BE- VII th Sem-Automobile Engineering-Nov/Dec-2011

GUJARAT TECHNOLOGICAL UNIVERSITY

BE SEM-VII Examination-Nov/Dec.-2011

Subject code: 171902

Subject Name: Automobile Engineering

Mechanical Engineering

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Classify Auto-vehicles from different aspects. Quote

examples of each basis of their classification.

(b) What are the functions of the following accessories?

i) Mirror ii) Speedometer iii) Odometer

iv) Windscreen wiper v) Sun visors vi) Horn

vii) Fuel Gauge

Q.2 (a) Explain the single plate clutch with neat sketch.

(b) Describe the common features and major differences in a

constant mesh and synchromesh gear box.

OR

(b) Describe construction and explain working of a fluid

flywheel with the help of suitable diagrams. Discuss the

characteristics, merits and demerits.

Q.3 (a) What is transfer box? Where it is used? Describe clearly

the construction and working of any transfer box.

(b) Explain the working of conventional differential gear box

with neat sketch.

OR

Q.3 (a) Explain the working principal of two universal joints to

obtain constant velocity.

(b) (i) Explain rolling resistance, gradient resistance, and wind

resistance

(ii) The engine of a jeep is known to be able to provide

40.5 bkW for propulsion purposes. In a certain application,

the jeep weighing 12459 N, is required to pull a trailer of

gross weight 10673 N at a speed of 57.75 kM/hr in top gear

on level. The resistance to motion is given by the equation

R=a*W+b*V2 , Where a=0.016 and b=0.055, W in N and

V in kM/hr. Find out if the jeep is adequate for the job, if

the transmission efficiency is 90%.

Q.4 (a) Differentiate clearly between the function of spring and a

shock absorber. Explain the construction and working of a

telescopic type of shock absorber with the help of neat

diagram.

(b) Write notes on( i) Torsion bar (ii) Helper spring

OR

Q.4 (a) Draw a simplified wiring circuit for the lighting system of car and discuss the same.

Q.4 (b) Name different types of driving licenses. What restrictions

are imposed on a learner’s driving license? Discuss the

details in order to get a permanent license.

Q.5 (a) Explain the terms: Camber, Castor, and steering axis

inclination. What are the effects of each on steering

characteristics of a vehicle?

(b) What is “Ply rating” of a tyre? How does a tubeless tyre

differ from a tubed tyre in its construction? Compare the

merits and demerits of tubeless tyres.

OR

Q.5 (a) Draw a neat sketch and compare a disk brake and drum brake.

(b) Explain construction and working of vacuum brake.