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The difference between CAD and CAM is that CAD software is directed at product design while CAM software is:
A
concerned with production and control of tool design
B
concerned with management programs
C
designed for communications
D
specifically for PC-board design
E
None of the above
Correct Answer:
concerned with production and control of tool design
A cam should be designed only using uniform rise and fall within half of the cam, the remaining is dwell period, and without any dwell period in between the rise -fall periods and rise and fall periods should be same. The maximum rise in follower is 30 mm. How much the follower will rise when the follower is 120 degrees from its initial position of a cam?
A
30
B
20
C
15
D
10
A cam should be designed only using uniform rise and fall within half of the cam, the remaining is dwell period, and without any dwell period in between the rise-fall periods and rise and fall periods should be same. The maximum rise in follower is 45 mm. How much the follower will rise when the follower is 45 degrees from its initial position of a cam?
A
22.5
B
0
C
30
D
15
A cam should be designed only using uniform rise and fall within the second half of cam profile, the first half is dwell period, without any dwell period in between the rise and fall periods and rise and fall periods should be same. The maximum rise in follower is 45 mm. How much the follower will rise when the follower is 120 degrees from its initial position of a cam?
A
15
B
30
C
20
D
0
A cam should be designed only using uniform rise and fall within the second half of cam profile, the first half is dwell period, without any dwell period in between the rise and fall periods and rise and fall periods should be same. The maximum rise in follower is 55 mm. How much the follower will rise when the follower is 240 degrees from its initial position of a cam?
A
18.3
B
0
C
27.5
D
36.6
A cam should be designed only using uniform rise and fall within first half of cam profile, the remaining is dwell period, and without any dwell period in between the rise-fall periods and rise and fall periods should be same. The maximum rise in follower is 35 mm. How much the follower will rise when the follower is 240 degrees from its initial position of a cam?
A
17.5
B
11.6
C
0
D
23.3
Which of the following statement (s) is/are true about the following eliminations? (1) Hoffmann product is major product in I (2) Saytzeff product is major product in I (3) Hoffmann product is major product in II (4) Saytzeffproduct is major product in II
A
1 and 2
B
1 and 4
C
2 and 3
D
3 and 4
What is the difference between asteroids and comets?
1. Asteroids are small rocky planetoids, while comets are formed of frozen gases held together by rocky and metallic material.
2. Asteroids are found mostly between the orbits of Jupiter and Mars, while comets are found mostly between Venus and Mercury.
3. Comets show a perceptible glowing tail, while asteroids do not.
Which of the statements given above is/are correct?
A
1 and 2 only
B
1 and 3 only
C
3 only
D
1, 2 and 3
From the given data, calculate the acceleration of follower in m/s2 at the beginning of the lift for a symmetrical tangent cam operating a roller follower. Least radius of the cam is 30 mm; Roller radius is 17.5 mm. The angle of ascent is 75° and the total lift is 17.5 mm. The speed of the cam shaft is 600 r.p.m.
A
187.6
B
185.5
C
183.2
D
190.1
The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r
1
= Minimum radius of the cam and θ = Angle turned through by the cam)
A
R(1 - cosθ)
B
(R - r<sub>1</sub>)(1 - cosθ)
C
R(1 - sinθ)
D
(R - r<sub>1</sub>)(1 - sinθ)
The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r
1
= Minimum radius of the cam, r
2
= Radius of the roller follower and $$\theta $$ = Angle turned by the cam from the beginning of the follower displacement)
A
$$\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)\left( {1 - \cos \theta } \right)$$
B
$$\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\left( {1 + \cos \theta } \right)$$
C
$$\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)\left( {\frac{{1 - \cos \theta }}{{\cos \theta }}} \right)$$
D
$$\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\left( {\frac{{1 - \cos \theta }}{{\cos \theta }}} \right)$$