136 TOP Machine Design Multiple choice Questions and Answers

  1. The ultimate strength of steel in tension in comparison to shear is in the ratio of
    1. 1:1
    2. 2:1
    3. 3:2
    4. 2:3
    5. 1:2
Answer
Ans: A
  1. The permissible stress for carbon steel under static loading is generally taken as
  1. 2000-3000 kg/pm2
  2. 3000-4000 kg/cm2
  3. 4000-4500 kg/cm2
  4. 7500-10,000 kg/cm2
  5. 10,000-15,000 kg/cm2
Answer
Ans: A
  1. The property of a material which enables it to resist fracture due to high impact loads is known as
  1. elasticity
  2. endurance
  3. strength
  4. toughness
  5. resilience
Answer
Ans: A
  1. A hot short metal is
  1. brittle when cold
  2. brittle when hot
  3. brittle under all conditions
  4. ductile at high temperature
  5. hard when hot
Answer
Ans: A
  1. Guest’s theory of failure is applicable for following type of materials
  1. brittle
  2. ductile
  3. elastic
  4. plastic
  5. tough
Answer
Ans: A
  1. Rankine’s theory of failure is applicable for following type of materials
  1. brittle
  2. ductile
  3. elastic
  4. plastic
  5. tough
Answer
Ans: A
  1. If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity SC is propagated through the bar as follows
  1. vpE
  2. vVvF
  3. WpE/2
  4. IvHpE
  5. none of the above, where E = modulus of elasticity and p = mass density
Answer
Ans: A
  1. Tensile strength of a mild steel specimen can be roughly predicted from following hardness test
  1. Brinell
  2. Rockwell
  3. Vicker
  4. Shore’s sceleroscope
  5. none of the above
Answer
Ans: A
  1. Resilience of a material is important, when it is subjected to
  1. combined loading
  2. fatigue
  3. thermal stresses
  4. wear and tear
  5. shock loading
Answer
Ans: E
  1. In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by
  1. decreasing the cross-section area of’ bar
  2. increasing the cross-section area of bar
  3. remain unaffected with cross-section area
  4. would depend upon other factors
  5. none of the above
Answer
Ans: A

Leave a Reply