1) According to synthesis of mechanism, which synthesis step includes degree of freedom for a specified motion?
a. Type synthesis
b. Number synthesis
c. Dimensional synthesis
d. All of the above
|
2) Which equation is known as Freudenstein's equation?
a. K1 – sin Φ – K2 sin θ + K3 = sin ( θ + Φ)
b. K1 – cos Φ – K2 cos θ + K3 = cos ( θ + Φ)
c. K1 – sin Φ – K2 sin θ + K3 = sin ( θ - Φ)
d. K1 – cos Φ – K2 cos θ + K3 = cos ( θ - Φ)
|
3) Branch defect is observed in
a. grashof type four bar chain linkage
b. non-grashof type four bar chain linkage
c. both grashof and non-grashof type four bar chain linkage
d. none of the above
|
4) Which of the following statements is/are true for errors in function generation?
a. At precision points structural error is zero
b. Structural errors exist only if mechanical errors exist in synthesized mechanism
c. Structural errors cannot be reduced by increasing number of precession points
d. All of the above
|
5) Why is an overlay method used in synthesis of a function generation?
a. It is used to generate precision positions in four bar mechanism
b. It is used to generate precision positions in slider crank mechanism
c. both a and b
d. none of the above
|
6) Which type of cam does not require any external force to have contact between cam and follower?
a. Preloaded spring cam
b. Conjugate cam
c. Both a. and b.
d. None of the above
|
7) Which of the following statements is/are true for cam profile?
a. Pitch point on the pitch curve has minimum pressure angle
b. In case of roller follower, trace point represents centre of the roller
c. Pitch circle is drawn through trace point from the center of cam
d. All of the above
|
Answer
Explanation
Related Ques
|
ANSWER: In case of roller follower, trace point represents centre of the roller
Explanation:
No explanation is available for this question!
|
|
8) A cam operating roller follower has the following dimensions, radius of base and nose circle as 15 mm and 10 mm respectively and distance between them is 8 mm. Determine lift made by the follower
a. 5 mm
b. 12.5 mm
c. 3 mm
d. 17 mm
|
9) What is meant by jump phenomenon in cam and follower system?
a. Follower looses contact with cam surface when cam rotates beyond particular speed due to inertia forces
b. Follower looses contact with cam surface when follower rotates beyond particular speed due to gravitational force
c. Follower looses contact with cam surface when cam rotates beyond particular speed due to gravitational forces
d. None of the above
|
Answer
Explanation
Related Ques
|
ANSWER: Follower looses contact with cam surface when cam rotates beyond particular speed due to inertia forces
Explanation:
No explanation is available for this question!
|
|
10) To avoid jump phenomenon, which of the following condition should be true?
Where,
P = preload in spring, ω = cam speed, k = stiffness of spring, e = eccentricity
a. ω > √ (me) / ( P + 2 ke)
b. ω > √( P + 2 ke) / (me)
c. ω < √( P + 2 ke) / (me)
d. ω < √ (me) / ( P + 2 ke)
|
11) Interference in gear tooth profiles can be avoided by
a. modifying tooth profile
b. modifying center distance between pinion and wheel
c. both a. and b.
d. none of the above
|
12) In involute gears what is the effect of center distance variation on velocity ratio?
a. Velocity ratio increases
b. Velocity ratio decreases
c. It has no effect on velocity ratio
d. None of the above
|
13) Calculate number of teeth on wheel to avoid interference, if wheel has addendum coefficient of one and velocity ratio 4. Pressure angle being 22o and gear ratio of 2
a. 10
b. 24
c. 34
d. None of the above
|
14) What is meant by contact ratio in gears?
a. Ratio of length of arc of approach and circular pitch
b. Ratio of circular pitch and length of arc of contact
c. Ratio of length of arc of recess and circular pitch
d. Ratio of length of arc of contact and circular pitch
|
Answer
Explanation
Related Ques
|
ANSWER: Ratio of length of arc of contact and circular pitch
Explanation:
No explanation is available for this question!
|
|
15) Calculate the number of teeth on wheel, when number of teeth on pinion and wheel are equal. Pressure angle is 25o
a. 11
b. 12
c. 7
d. 9
|
16) Which of the following conditions specify maximum efficiency of spiral gears?
a. (θ + α) / 2
b. (θ – α) / 2
c. Both a. and b.
d. None of the above
|
17) Back cone angle is observed in which type of gears?
a. Spur gears
b. Helical gears
c. Bevel gears
d. None of the above
|
18) Which formula is used to calculate maximum efficiency of worm gear?
a. tan δ / tan ( δ + Φ)
b. (1 – sin Φ) / ( 1 + sin Φ)
c. tan ( δ + Φ) / tan δ
d. (1 + sin Φ) / ( 1 – sin Φ)
|
19) If friction angle Φ = 5.43o, calculate maximum efficiency of worm gearing
a. 82.71 %
b. 90.53 %
c. 80.23 %
d. None of the above
|
20) In spiral gears if normal circular pitch is 13 mm. What is the normal module?
a. 40.84 mm
b. 2.06 mm
c. 4.13 mm
d. None of the above
|
21) For a simple gear train, velocity ratio is the ratio of
a. Speed of driving shaft and speed of driven shaft
b. Speed of driven shaft and speed of driving shaft
c. Speed of driven shaft and (speed of driving shaft + speed of idler gears)
d. Speed of driving shaft and (speed of driven shaft + speed of idler gears)
|
Answer
Explanation
Related Ques
|
ANSWER: Speed of driven shaft and speed of driving shaft
Explanation:
No explanation is available for this question!
|
|
22) Which of the following statements is/are true for a simple gear train?
a. If number of idle gears is even, driving and driven wheels rotate in opposite direction
b. If number of idle gears is odd, driving and driven wheels rotate in opposite direction
c. If number of idle gears is even, driving and driven wheels rotate in same direction
d. None of the above
|
Answer
Explanation
Related Ques
|
ANSWER: If number of idle gears is even, driving and driven wheels rotate in opposite direction
Explanation:
No explanation is available for this question!
|
|
23) Calculate the speed of driven shaft in compound gear train, if the drivers have 40, 70, 100, and 150 teeth and followers have 15, 44, 60, 100 teeth. Speed of driving shaft is 150 rpm
a. 256 rpm
b. 1650 rpm
c. 1590.90 rpm
d. 1414 .28 rpm
|
24) Calculate speed of driving shaft in compound gear train, if the drivers have 50, 60, 80 and 100 teeth and followers have 18, 40, 60 and 80 teeth. Speed of driven shaft is 150 rpm
a. 21.73 rpm
b. 30.23 rpm
c. 19.77 rpm
d. None of the above
|
25) Which type of gear box is used in automobiles?
a. Sliding mesh gear box
b. Differential gear box
c. Synchromesh gear box
d. All of the above
|
