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Which of the below are inversions of slider crank mechanism? <br> 1. Oscillating cylinder engine mechanism<br> 2. Toggle mechanism<br> 3. Radial cylinder engine mechanism<br> 4. Quick return mechanism
A
1, 2 and 4
B
2, 3 and 4
C
1, 2 and 3
D
1, 3 and 4
Correct Answer:
1, 3 and 4
Consider the following statements: In a slider-crank mechanism, the slider is at its dead centre position when the (i) slider velocity is zero (ii) slider velocity is maximum (iii) slider acceleration is zero (iv) slider acceleration is maximum Which of the above statements are correct?
A
1 and 4
B
1 and 3
C
2 and 3
D
2 and 4
Match list I with list II List I List II A. Pantograph 1. Scotch yoke mechanism B. Single slider crank 2. Double lever mechanism C. Double slider crank chain 3. Tchebicheff’s mechanism D. Straight line motion mechanism 4. Double crank 5. Hand pump
A
A-4,B-3,C-5,D-1
B
A-2,B-5,C-1,D-3
C
A-2,B-1,C-5,D-3
D
A-4,B-5,C-2,D-1
Which of the following are the inversions of double slider crank chain? 1. Oldhan coupling 2. Whitworth quick return mechanism 3. Beam engine mechanism 4. Elliptical Trammel mechanism The correct answer codes are
A
1 and 2
B
1 and 4
C
2, 3 and 4
D
1, 2 and 3
In a slider crank mechanism, the length of the crank and connecting rod are 150 mm and 600 mm respectively. The crank position is 60° from inner dead centre. The crank shaft speed is 400 r.p.m. (clockwise). Velocity of the slider is ________
A
6.9 m/s
B
6.12 m/s
C
7.32 m/s
D
6.66 m/s
Match the following Types of mechanism Motion achieved P. Scott Russel mechanism 1. Intermittent motion Q. Geneva mechanism 2. Quick return motion R. Off set slider crank mechanism 3. Simple harmonic motion S. scotch Yoke mechanism 4. Straight line motion
A
P-2,Q-3,R-1,S-4
B
P-3,Q-2,R-4,S-1
C
P-4,Q-1,R-2,S-3
D
P-4,Q-3,R-1,S-2
If the crank rotation angle varies from 45 degrees to 135 degrees, Using three precision points with chebyshev’s spacing, synthesize a slider crank mechanism where where displacement of slider is square of the crank rotation. From the above information calculate ‘a’ in mm.
A
48.2
B
58.2
C
45.6
D
42.2
If the crank rotation angle varies from 45 degrees to 135 degrees, Using three precision points with chebyshev’s spacing, synthesize a slider crank mechanism where where displacement of slider is square of the crank rotation. From the above information calculate ‘c’ in mm.
A
148.2
B
158.2
C
135.7
D
120.2
If the crank rotation angle varies from 45 degrees to 135 degrees, Using three precision points with chebyshev’s spacing, synthesize a slider crank mechanism where where displacement of slider is square of the crank rotation. From the above information calculate ‘b’ in mm.
A
148.2
B
158.2
C
135.7
D
120.2
In a slider crank mechanism, the length of the crank and connecting rod are 180 mm and 540 mm respectively. The crank position is 45° from inner dead centre. The crank shaft speed is 450 r.p.m. (clockwise), calculate angular velocity of the connecting rod in rad/s.
A
10.3
B
11.1
C
12.2
D
11.8
In a slider-crank mechanism, the crank is rotating with an angular velocity of 20 rad/s in counterclockwise direction. At the instant when the crank is perpendicular to the direction of the piston movement, velocity of the piston is 2 m/s. Radius of the crank is
A
100 cm
B
10 cm
C
1 cm
D
0.1 cm