Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem Old 160201 Automobile Component Design Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(OLD) ? EXAMINATION ? SUMMER 2019
Subject Code:160201 Date:27/05/2019
Subject Name: Automobile Component Design
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain the working of valve gear mechanism for a given I.C. engine with neat
sketch.
07
(b) A helical cast steel gear with 30? helix angle has to transmit 35 kW at 1500 r.p.m.
If the gear has 24 teeth, determine the necessary module, pitch diameter and face
width for 20?full depth teeth. The static stress for cast steel may be taken as 56
MPa. The width of face may be taken as 3 times the normal pitch. What would
be the end thrust on the gear? The tooth factor for 20?full depth involute gear
may be taken as
0.154- 0.0912 , where TE represents the equivalent number of teeth.
TE
07
Q.2 (a) Explain the designing procedure of multi speed automobile gear box 07
(b) A bronze spur pinion rotating at 600 r.p.m. drives a cast iron spur gear at a
transmission ratio of 4 : 1. The allowable static stresses for the bronze pinion and
cast iron gear are84 MPa and 105 MPa respectively. The pinion has 16 standard
20? full depth involute teeth of module 8 mm. The face width of both the gears
is 90 mm. Find the power that can be transmitted from the standpoint of strength.
07
OR
(b) A shaft rotating at constant speed is subjected to variable load. The bearings
supporting the shaft are subjected to stationary equivalent radial load of 3 kN for
10 per cent of time, 2 kN for 20 per cent of time, 1 kN for 30 per cent of time and
no load for remaining time of cycle. If the total life expected for the bearing is 20
? 106 revolutions at 95 per cent reliability, calculate dynamic load rating of the
ball bearing.
07
Q.3 (a) Explain the following terms in relation with rolling contact bearing
1)Equivalent load , 2)Bearing life.
07
(b) A four stroke diesel engine has the following specifications :
Brake power = 5 kW ; Speed = 1200 r.p.m. ; Indicated mean effective pressure =
0.35 N / mm 2 ; Mechanical efficiency = 80 %.
Determine: 1. bore and length of the cylinder ; 2. thickness of the cylinder head ;
and 3. size of studs for the cylinder head.
07
OR
Q.3 (a) Determine the beam strength and face width of helical gears, also explain the
following 1) Helix angle 2) Axial pitch 3) Normal Pitch
07
(b) Design a cast iron piston for a single acting four stroke engine for the following
data:
Cylinder bore = 100 mm ; Stroke = 125 mm ; Maximum gas pressure = 5 N/mm2
; Indicated mean effective pressure = 0.75 N/mm2 ; Mechanical efficiency = 80%
; Fuel consumption = 0.15 kg per brake power per hour ; Higher calorific value
of fuel = 42 ? 103 kJ/kg ; Speed = 2000 r.p.m.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(OLD) ? EXAMINATION ? SUMMER 2019
Subject Code:160201 Date:27/05/2019
Subject Name: Automobile Component Design
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Explain the working of valve gear mechanism for a given I.C. engine with neat
sketch.
07
(b) A helical cast steel gear with 30? helix angle has to transmit 35 kW at 1500 r.p.m.
If the gear has 24 teeth, determine the necessary module, pitch diameter and face
width for 20?full depth teeth. The static stress for cast steel may be taken as 56
MPa. The width of face may be taken as 3 times the normal pitch. What would
be the end thrust on the gear? The tooth factor for 20?full depth involute gear
may be taken as
0.154- 0.0912 , where TE represents the equivalent number of teeth.
TE
07
Q.2 (a) Explain the designing procedure of multi speed automobile gear box 07
(b) A bronze spur pinion rotating at 600 r.p.m. drives a cast iron spur gear at a
transmission ratio of 4 : 1. The allowable static stresses for the bronze pinion and
cast iron gear are84 MPa and 105 MPa respectively. The pinion has 16 standard
20? full depth involute teeth of module 8 mm. The face width of both the gears
is 90 mm. Find the power that can be transmitted from the standpoint of strength.
07
OR
(b) A shaft rotating at constant speed is subjected to variable load. The bearings
supporting the shaft are subjected to stationary equivalent radial load of 3 kN for
10 per cent of time, 2 kN for 20 per cent of time, 1 kN for 30 per cent of time and
no load for remaining time of cycle. If the total life expected for the bearing is 20
? 106 revolutions at 95 per cent reliability, calculate dynamic load rating of the
ball bearing.
07
Q.3 (a) Explain the following terms in relation with rolling contact bearing
1)Equivalent load , 2)Bearing life.
07
(b) A four stroke diesel engine has the following specifications :
Brake power = 5 kW ; Speed = 1200 r.p.m. ; Indicated mean effective pressure =
0.35 N / mm 2 ; Mechanical efficiency = 80 %.
Determine: 1. bore and length of the cylinder ; 2. thickness of the cylinder head ;
and 3. size of studs for the cylinder head.
07
OR
Q.3 (a) Determine the beam strength and face width of helical gears, also explain the
following 1) Helix angle 2) Axial pitch 3) Normal Pitch
07
(b) Design a cast iron piston for a single acting four stroke engine for the following
data:
Cylinder bore = 100 mm ; Stroke = 125 mm ; Maximum gas pressure = 5 N/mm2
; Indicated mean effective pressure = 0.75 N/mm2 ; Mechanical efficiency = 80%
; Fuel consumption = 0.15 kg per brake power per hour ; Higher calorific value
of fuel = 42 ? 103 kJ/kg ; Speed = 2000 r.p.m.
07
2
Any other data required for the design may be assumed. Design a only following
part
1) Piston head or crown
2) Piston rings
3) Piston skirt
4) Piston pin
Q.4 (a) Explain strength rating and wear rating of worm gears 07
(b) Design of the crankshaft when the crank is at the dead centre for the following
data
:Bore = 400 mm ; Stroke = 600 mm ; Engine speed = 200 r.p.m. ; Mean effective
pressure = 0.5 N/mm2; Maximum combustion pressure = 2.5 N/mm2; Weight of
flywheel used as a pulley = 50 kN; Total belt pull = 6.5 kN. When the crank has
turned through 35? from the top dead centre, the pressure on the piston is
1N/mm2 and the torque on the crank is maximum. The ratio of the connecting
rod length to the crank radius is 5. Assume any other data required for the design.
07
OR
Q.4 (a) Explain Design Criteria of intake manifold and exhaust manifold 07
(b) A side or overhung crankshaft for a 250 mm ? 300 mm gas engine. The
weight of the flywheel is 30 kN and the explosion pressure is 2.1 N/mm2. The
gas pressure at the maximum torque is 0.9 N/mm2, when the crank angle is 35?
from I. D. C. The connecting rod is 4.5 times the crank radius. Design of
crankshaft when the crank is at the dead centre
07
Q.5 (a) Discuss causes of failure in rolling contact bearing. 07
(b) Explain types of worm gears & Efficiency of worm gears. 07
OR
Q.5 (a)
What do you mean of creep? Explain Hot Working Process
07
(b)
Differentiate between dry and wet liner. Describe the Ideal properties required for engine
Piston material
07
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This post was last modified on 20 February 2020