Machine Design Objective Questions with Answers - Set 01

Practice Test: Question Set - 01

1. The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given by
     Where m = mass of belt per meter (kg/m)
              v = belt velocity (m/s)
              f = coefficient of friction
              a = angle of wrap (radians)
    (A) (P1 - mv²)/ (P2 - mv²) = eᶠα
    (B) P1 / P2 = eᶠα
    (C) P1 / P2 = eα
    (D) (P1 - mv²)/ (P2 - mv²) = eα

2. The ultimate strength of steel in tension in comparison to shear is in the ratio of
    (A) 1: 1
    (B) 2:1
    (C) 3: 2
    (D) 2: 3

3. In radial cams, the follower moves
    (A) In a direction parallel to the cam axis
    (B) In a direction perpendicular to the cam axis
    (C) In any direction irrespective of cam axis
    (D) Along the cam axis

4. The permissible stress for carbon steel under static loading is generally taken as
    (A) 2000-3000 kg/m²
    (B) 3000-4000 kg/cm²
    (C) 4000-4500 kg/cm²
    (D) 7500-10,000 kg/cm²

5. The property of a material which enables it to resist fracture due to high impact loads is known as
    (A) Elasticity
    (B) Endurance
    (C) Strength
    (D) Toughness

6. In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because
    (A) Belts are available in sets 
    (B) Only one belt cannot be fitted with other used belts 
    (C) The new belt will carry more than its share and result in short life 
    (D) New and old belts will cause vibrations

7. A hot short metal is
    (A) Brittle when cold
    (B) Brittle when hot
    (C) Brittle under all conditions
    (D) Ductile at high temperature

8. In case of pressure vessels having closed ends, the fluid pressure induces
    (A) Longitudinal stress
    (B) Shear stress
    (C) Circumferential stress
    (D) None of these

9. Guest's theory of failure is applicable for following type of materials
    (A) Brittle
    (B) Ductile
    (C) Elastic
    (D) Plastic

10. A V-belt designated as B 4430 LP has
    (A) 4430 mm as diameter of small pulley 
    (B) 4430 mm as nominal pitch length 
    (C) 4430 mm as diameter of large pulley 
    (D) 4430 mm as centre distance between pulleys

11. Rankine's theory of failure is applicable for following type of materials
    (A) Brittle
    (B) Ductile
    (C) Elastic
    (D) Plastic

12. Screws used for power transmission should have
    (A) Very fine threads
    (B) High efficiency
    (C) Low efficiency
    (D) Strong teeth

13. The value of stress concentration factor depends upon
    (A) Material and geometry of the part
    (B) Geometry of the part
    (C) Material of the part
    (D) None of these

14. Tensile strength of a mild steel specimen can be roughly predicted from following hardness test
    (A) Brinell
    (B) Rockwell
    (C) Vickers
    (D) None of the above

15. Resilience of a material is important, when it is subjected to
    (A) Combined loading
    (B) Fatigue
    (C) Thermal stresses
    (D) Shock loading

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