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Total Questions : 543 | Page 52 of 55 pages
Question 511. In a screw jack, the effort required to lower the load W is given by
  1.    $${\text{P}} = {\text{W}}\tan \left( {\alpha - \varphi } \right)$$
  2.    $${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$
  3.    $${\text{P}} = {\text{W}}\tan \left( {\varphi - \alpha } \right)$$
  4.    $${\text{P}} = {\text{W}}\cos \left( {\alpha + \varphi } \right)$$
 Discuss Question
Answer: Option C. -> $${\text{P}} = {\text{W}}\tan \left( {\varphi - \alpha } \right)$$
Question 512. Which type of gearing is used in steering system of an automobile?
  1.    Rack and pinion
  2.    Worm and wheel
  3.    Spiral gears
  4.    None of the above
 Discuss Question
Answer: Option A. -> Rack and pinion
Question 513. Which of the following is an example of a higher pair?
  1.    Toothed gearing
  2.    Belt and rope drive
  3.    Ball and roller bearing
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 514. In involute gears, the pressure angle is
  1.    Dependent on the size of teeth
  2.    Dependent on the size of gears
  3.    Always constant
  4.    Always variable
 Discuss Question
Answer: Option C. -> Always constant
Question 515. In order to balance the reciprocating masses,
  1.    Primary forces and couples must be balanced
  2.    Secondary forces and couples must be balanced
  3.    Both (A) and (B)
  4.    None of these
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 516. The ratio of maximum fluctuation of energy to the work-done per cycle is called
  1.    Fluctuation of energy
  2.    Maximum fluctuation of energy
  3.    Coefficient of fluctuation of energy
  4.    None of these
 Discuss Question
Answer: Option C. -> Coefficient of fluctuation of energy
Question 517. When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a
  1.    Lower pair
  2.    Higher pair
  3.    Self-closed pair
  4.    Force-closed pair
 Discuss Question
Answer: Option D. -> Force-closed pair
Question 518. Which of the following statement is correct for involute gears?
  1.    The interference is inherently absent.
  2.    The variation in centre distance of shafts increases radial force.
  3.    A convex flank is always in contact with concave flank.
  4.    The pressure angle is constant throughout the teeth engagement.
 Discuss Question
Answer: Option D. -> The pressure angle is constant throughout the teeth engagement.
Question 519. The number of centers in a crank driven slider crank mechanism is
  1.    0
  2.    2
  3.    4
  4.    6
 Discuss Question
Answer: Option B. -> 2
Question 520. In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T1 acts at A and smaller tension T2 at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should
  1.    Be zero
  2.    Act in upward direction
  3.    Act in downward direction
  4.    None of the above
 Discuss Question
Answer: Option C. -> Act in downward direction

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