Multiple Choice Questions on Machine Design - Set 32 - ObjectiveBooks

# Practice Test: Question Set - 32

1. The velocity of sliding __________ the distance of the point of contact from the pitch point.
(A) Is directly proportional to
(B) Is inversely proportional to
(C) Is equal to cos Ï† multiplied by
(D) Does not depend upon

2. Idler pulley is used for
(A) Increasing velocity ratio
(B) For applying tension
(C) Changing the direction of motion of belt
(D) All of these

3. The period during which the cam follower remains at rest, when cam moves, is known as
(A) Constant period
(B) Fixed period
(C) Dwell period
(D) Idle period

4. According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be
(A) 45 to 60%
(B) 63 to 70%
(C) 70 to 83%
(D) 80 to 90%

5. Crowning on pulley helps
(A) In decreasing the slip of the belt
(B) In increasing the slip of the belt
(C) To keep the belt in centre on a pulley while it is in motion
(D) To increase pulley life

6. Which of the following coupling is used to connect two shafts which have both lateral and angular misalignment?
(A) Bushed pin type coupling
(B) Universal coupling
(C) Oldham coupling
(D) All of these

7. An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called
(B) Dedendum circle
(C) Pitch circle
(D) Clearance circle

8. Which of the following statement is wrong for a connecting rod?
(A) The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy
(B) If Ixx > 4 Iyy, the buckling will occur about Y-axis
(C) If Ixx < 4 Iyy, the buckling will occur about X-axis
(D) The most suitable section for the connecting rod is T-section

9. Which of the following statement is correct regarding power screws?
(A) The efficiency of a self locking screw can not be more than 50%
(B) The efficiency of Acme (trapezoidal) thread is less than that of a square thread
(C) If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
(D) Both (A) and (B)

10. Which of the following statement is wrong?
(A) A key is used as a temporary fastening
(B) A key is subjected to tensile stresses
(C) A key is always inserted parallel to the axis of the shaft
(D) A key prevents relative motion between the shaft and boss of the pulley

11. A spring is used to
(A) Measure forces
(B) Apply forces
(C) Store energy
(D) All of these

12. The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)
(A) Gd⁴/ 8D3n
(B) Gd3/ 8D3n
(C) Gd⁴/ 4D3n
(D) Gd⁴/ 8D²n

13. Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to
(A) W/2
(B) 2W/3
(C) W/9
(D) 8W/9

14. When the fulcrum is in between the load and effort, the lever is said to be of
(A) First type
(B) Second type
(C) Third type
(D) Any one of these

15. A column is known as a long column if the slenderness ratio is
(A) 40
(B) 50
(C) 70
(D) 100

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