State the necessity of Acceleration diagram of a mechanism.

1) Acceleration diagram is important in mechanism , because acceleration is directly related to
force. F = m * a
2) By calculating acceleration, we calculate inertia force acting on different links.
3) Design of machine parts rotating at higher speed becomes safe.

Define completely constrained motion and successfully constrained motion.

1)Completely constrained motion :- When the motion between a pair is limited to a definite
direction irrespective of the direction of force applied, then the motion is said to be a completely
constrained motion.
2)Successfully constrained motion:- When the motion between the elements, forming a pair, is
such that the constrained motion is not completed by itself, but by some other means, then the
motion is said to be successfully constrained motion.

The weights of four masses A, B, C, D are 200 kg, 300 kg, 240 kg, 260 kg respectively. The corresponding radii of rotation are 200 mm, 150 mm, 250 mm and 300 mm respectively and the angle between successive masses are 45°, 75° and 135°. Find the position

The weights of four masse A, B, C, D are 200 Kg, 300 Kg, 240 Kg and 260 Kg
respectively. The corresponding radii of rotation are 200 mm, 150 mm, 250 mm and
300 mm respectively and the angle between successive masses are 45o, 75o and
135o. Find the position and magnitude of the balance weight required if its radius of
rotation is 200 mm.

OR

Two pulleys one 450 mm diameter and the other 200 mm diameter are on parallel shafts 1.95 m apart and are connected by a crossed belt. Find the length of belt required and angle of contact between belt and each pulley. Estimate the power transmitted by

Two pulleys one 450 mm diameter and the other 200 mm diameter are on parallel shafts 1.95
m apart and are connected by a crossed belt. Find the length of belt required and angle of
contact between belt and each pulley. Estimate the power transmitted by belt when the
larger pulley rotates at 200 rpm. If the maximum tension in the belt is 1 KN and coefficient of
friction between belt and pulley is 0.25.

A 4-bar mechanism has following dimensions: l(DA)= 300 mm l(CB) = l(AB) = 360 mm l(DC) = 600 mm. The link ‘DC’ is fixed. The angle ADC is 60° The driving link ‘DA’ rotates at a speed of 100 rpm clockwise and constant driving torque is 50 N.M. Calcul

A 4-bar mechanism has following dimensions:
l(DA) = 300 mm, l(CB) = l(AB) = 360mm, l(DC) = 600 mm. the link ‘DC’ is fixed. The
angle ADC is 60o. The driving link ‘DA’ rotates at a speed of 100 rpm clockwise and
constant driving torque is 50 N-m. Calculate the velocity of point ‘B’ and angular
velocity of driven link ‘CB’.
Given Data:
N AD = 100 rpm
DA = 300 mm = 0.3 m
T A = 50 N-m
ω AD = 2 π x 100 /60 = 10.47 rad/sec.
Velocity of A w.r.t. D (V AD);

 

Two parallel shafts whose centre lines are 4.8 m apart are connected by open belt drive. The diameter of larger pulley is 1.5 m and that of smaller pulley 1 m. The initial tension in the belt when stationary is 3 kN. The mass of the belt is 1.5 kg/m lengt

Two parallel shafts whose centre lines are 4.8 m apart are connected by open belt
drive. The diameter of larger pulley is 1.5 m and that of smaller pulley 1 m. the initial
tension in the belt when stationary is 3 KN. The mass of the belt is 1.5 Kg/m length.
The coefficient of friction between belt and pulley is 0.3. Taking centrifugal tension
in to account, calculate power transmitted when smaller pulley rotates at 400 rpm.

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