Lakshya Education MCQs

Question: The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is
Options:
A. ηh = ηo × ηm
B. ηm = ηm × ηh
C. ηo = ηh × ηm
D. None of these
Answer: Option C

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More Questions on This Topic :

Question 1. Metacentre is the point of intersection of
  1.     Vertical upward force through e.g. of body and center line of body
  2.     Buoyant force and the center line of body
  3.     Midpoint between e.g. and center of buoyancy
  4.     All of the above
Answer: Option B
Question 2. The conditions for the stable equilibrium of a floating body are
  1.     The metacentre should lie above the center of gravity
  2.     The center of buoyancy and the center of gravity must lie on the same vertical line
  3.     A righting couple should be formed
  4.     All the above are correct
Answer: Option D
Question 3. A streamline is defined as the line
  1.     Parallel to central axis flow
  2.     Parallel to outer surface of pipe
  3.     Of equal velocity in a flow
  4.     Along which the pressure drop is uniform
Answer: Option C
Question 4. With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will
  1.     Decrease
  2.     Increase
  3.     Remain unchanged
  4.     Depend upon the characteristics of liquid
Answer: Option A
Question 5. Mercury does not wet glass. this is due to property of liquid known as
  1.     Adhesion
  2.     Cohesion
  3.     Surface tension
  4.     Viscosity
Answer: Option C
Question 6. With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will
  1.     Decrease
  2.     Increase
  3.     Remain unchanged
  4.     Depend upon the characteristics of liquid
Answer: Option A

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