Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 5th Sem 2151902 Theory Of Machines Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? V EXAMINATION ? SUMMER 2020
Subject Code: 2151902 Date:27/10/2020
Subject Name: THEORY OF MACHINES
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Define: Dynamometer. Classify Dynamometer
03
(b) Compare single block brake and double block brake.
04
(c) list experimental methods of mass moment of inertia.
07
Explain any one .
Q.2 (a) Write briefly gyroscopic effect in an aero plane.
03
(b) Explain concept of gyroscopic couple.
04
(c) The mass of the turbine rotor of a ship is 20 tonnes and
07
has a radius of gyration of 0.60 m. Its speed is 2000
r.p.m. The ship pitches 60 above and below the horizontal
position. A complete oscillation takes 30 seconds and the
motion is simple harmonic. Solve the following:
(1) Maximum gyroscopic couple
(2) Maximum angular acceleration of the ship during
pitching
(3) The direction in which the bow will tend to turn
when rising, if the rotation of the rotor is
clockwise when looking from left.
OR
(c) Develop stability of four wheel vehicle moving in curved
07
path with neat sketch.
Q.3 (a) Define: (1) fluctuation of energy (2) Maximum
03
fluctuation of energy (3) co efficient of fluctuation of
energy
(b) Enlist dead weight governor. Explain any one.
04
(c) The
turning moment diagram for a multi cylinder engine
07
has been drawn to a scale 1 mm = 500 N-m vertically
and 1 mm = 30 horizontally. The intercepted areas
between the output torque curve and the mean resistance
line, taken in order from one end, are as follows:
+52, -124, +92, -140, +85, -72, and +107 mm2, when the
engine is running at a speed of 600 r.p.m and radius of
gyration is 0.6 m.. If the total fluctuation of speed is not
to exceed ? 1.5 % of the mean. Solve the mass of the
flywheel.
OR
Q.3 (a) Define: (1) flywheel (2) Maximum fluctuation of speed
03
(3) co efficient of fluctuation of speed
(b) Enlist spring controlled governor. Explain any one.
04
(c) Design of flywheel for punching press with help of neat
07
sketch.
1
Q.4 (a) Define: Clutch. Classify clutch.
03
(b) Explain Prony brake dynamometer.
04
(c) An automobile single plate clutch, effective on both side
07
consists of a pair of contacting surfaces. The inner and
outer radii of friction plate are 120 mm and 240 mm
respectively. The
co efficient of friction is 0.25 and total axial force is 15
kN. Determine the power transmitting capacity of the
clutch at 500 r.p.m. by using (1) Uniform wear theory
and (2) Uniform pressure theory.
OR
Q.4 (a) Define: Brake. Classify brake.
03
(b) Explain belt transmission dynamometer.
04
(c) Evaluate braking analysis of four wheeler with the help
07
of neat sketch.
Q.5 (a) Describe free body diagram.
03
(b) Explain D'Alembert's Principle.
04
(c) Analyze of dynamics force analysis of slider crank
07
mechanism.
OR
Q.5 (a) Describe shaking force and shaking moment.
03
(b) Explain Centroid and Center of mass.
04
(c) Analyze of dynamics force analysis of four bar
07
mechanism.
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This post was last modified on 04 March 2021