Machine Design Knowledge Test Questions - Set 40 - ObjectiveBooks
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# Practice Test: Question Set - 40

1. The stress in the bar when the load is applied suddenly is __________ as compared to the stress induced due to gradually applied loads.
(A) Same
(B) Double
(C) Three times
(D) Four times

2. All stresses produced in a belt are
(A) Compressive stresses
(B) Tensile stresses
(C) Both tensile and compressive stresses
(D) Shear stresses

3. A screw is specified by its
(A) Major diameter
(B) Minor diameter
(C) Pitch diameter
(D) Pitch

4. The longitudinal stress is __________ of the circumferential stress.
(A) One-half
(B) Two-third
(C) Three-fourth
(D) Double

5. A rivet is specified by
(A) Shank diameter
(B) Length of rivet
(C) Type of head
(D) Length of tail

6. A shaft is subjected to
(A) Bending stresses
(B) Shear stresses
(C) Combined bending and shear stresses
(D) All of these

7. When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)
(A) 0.5 d
(B) 0.75 d
(C) d
(D) 1.25 d

8. A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be
(A) τ/2
(B) τ
(C) 2 τ
(D) 4 τ

9. The radial distance from the __________ to the clearance circle is called working depth.
(A) Addendum circle
(B) Dedendum circle
(C) Pitch circle
(D) None of these

10. A screw will be self locking, if
(A) Friction angle is less than helix angle
(B) Friction angle is more than helix angle
(C) Friction angle is equal to helix angle
(D) Efficiency of screw is 100%

11. In cyclic loading, stress concentration is more serious in
(A) Brittle materials
(B) Ductile materials
(C) Brittle as well as ductile materials
(D) Elastic materials

12. In a turnbuckle, if one of the rods has left hand threads, then the other rod will have
(A) Right hand threads
(B) Left hand threads
(C) Multiple threads
(D) Pointed threads

13. The railway carriage couplings have
(A) Square threads
(B) Acme threads
(C) Knuckle threads
(D) Buttress threads

14. The anti-friction bearings
(A) Have low starting and low running friction at moderate speeds
(B) Have high initial cost
(C) Can carry both radial and thrust loads
(D) All of these

15. Lewis equation is applied
(A) Only to the pinion
(B) Only to the gear
(C) To stronger of the pinion or gear
(D) To weaker of the pinion or gear

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