Machine Design Objective Questions with Answers - Set 06 - ObjectiveBooks
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# Practice Test: Question Set - 06

1. If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)
(A) [(√P1 + √P2)/2]²
(B) P1 + P2
(C) 2 × (P1 + P2)
(D) [2 × (P1 + P2)] + Pc

2. A stud
(A) Has a head on one end and a nut fitted to the other
(B) Has head at one end and other end fits into a tapped hole in the other part to be joined
(C) Has both the ends threaded

3. Shear stress theory is applicable for
(A) Ductile materials
(B) Brittle materials
(C) Elastic materials
(D) All of the above

4. When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will
(A) Have contact at the bottom most of the bearing
(B) Move towards right of the bearing making no metal to metal contact
(C) Move towards right of the bearing making the metal to metal contact
(D) Move towards left of the bearing making metal to metal contact

5. A tap bolt
(A) Has a head on one end and a nut fitted to the other
(B) Has head at one end and other end fits into a tapped hole in the other part to be joined
(C) Has both the ends threaded

6. For applications involving high stresses in one direction only the following type of thread would be best suited

7. In a horizontal flat belt drive, it is customary to use
(A) Bottom side of belt as slack side
(B) Top side of belt as slack side
(C) Idler pulley
(D) None of the above

8. The included angle in unified of American National threads is
(A) 60°
(B) 55°
(C) 47°
(D) 29°

9. For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be
(A) 8
(B) 6
(C) 4
(D) 10

10. The function of a washer is to
(A) Provide cushioning effect
(B) Provide bearing area
(C) Absorb shocks and vibrations
(D) Provide smooth surface in place of rough surface

11. Cap screws are
(A) Similar to small size tap bolts except that a greater variety of shapes of heads are available
(B) Slotted for a screw driver and generally used with a nut
(C) Used to prevent relative motion between parts
(D) Provided with detachable caps

12. If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)
(A) P1 - P2
(B) P1 + P2
(C) 2 × (P1 + P2)
(D) [2 × (P1 + P2)] + Pc

13. An alien bolt is
(A) Self locking bolt
(B) Same as stud
(C) Provided with hexagonal depression in head
(D) Used in high speed components

14. The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be
(A) 2/8
(B) 8/2
(C) 4/8
(D) 8/4

15. Ball bearing type screws are found in following application
(A) Screw jack
(B) Aeroplane engines
(C) Crane
(D) Steering mechanism

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