Fluid Mechanics And Machinery Set 10

Mechanical Engineering

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This set of Fluid Mechanics and Machinery Multiple Choice Questions & Answers (MCQs) focuses on Fluid Mechanics And Machinery Set 10

Q1 | What is D’Alembert’s Paradox?
  • resistance= 0
  • drag force= 0
  • temperature = 0
  • pressure gradient= 0
Answer: drag force= 0
Q2 | The steady- state flow must satisfy
  • kirchhoff’s law
  • newtons law
  • rutherford’s experiment
  • kepler’s law
Answer: kirchhoff’s law
Q3 | Which among the following does not depend on the friction factor?
  • pipe diameter
  • fluid density
  • viscosity
  • weight
Answer: weight
Q4 | How do we calculate losses for a larger range of Reynolds number?
  • moody chart
  • bar chart
  • scatter chart
  • column histogram
Answer: moody chart
Q5 | Darcy- Weisbach equation gives relation between                     
  • pressure and temperature
  • mass, volume and pressure
  • head loss and pressure loss
  • pressure loss only
Answer: head loss and pressure loss
Q6 | Which among the following is formula for friction factor of circular pipes?
  • 16/re
  • 64/re
  • re/16
  • re/64
Answer: 64/re
Q7 | Loss of head due to friction is                      
  • directly proportional to hydraulic radius
  • inversely proportional to velocity
  • inversely proportional to hydraulic radius
  • directly proportional to gravitational constant
Answer: inversely proportional to hydraulic radius
Q8 | The formula for hydraulic diameter is             
  • 4a/p
  • 4ap
  • 4av
  • 4v
Answer: 4a/p
Q9 | What are the reasons for minor head loses in a pipe?
  • friction
  • heat
  • valves and bends
  • temperature
Answer: valves and bends
Q10 | What happens to the head loss when the flow rate is doubled?
  • doubles
  • same
  • triples
  • four times
Answer: four times
Q11 | Relative roughness is                   
  • ϵ/d
  • ϵ*d
  • ϵ/dm
  • ϵgd
Answer: ϵ/d
Q12 | The liquid flowing through a series of pipes can take up                     
  • pipes of different diameters
  • pipes of the same diameters only.
  • single pipe only
  • short pipes only
Answer: pipes of different diameters
Q13 | What is the total loss developed in a series of pipes?
  • sum of losses in each pipe only
  • sum of local losses only
  • sum of local losses plus the losses in each pipe
  • zero
Answer: sum of local losses plus the losses in each pipe
Q14 | The total head loss for the system is equal to                   
  • pipe length
  • pipe diameter
  • width of the reservoir
  • height difference of reservoirs
Answer: height difference of reservoirs
Q15 | Which among the following is not a loss that is developed in the pipe?
  • entry
  • exit
  • connection between two pipes
  • liquid velocity
Answer: liquid velocity
Q16 | Which among the following is the correct formula for head loss?
  • z1-z2
  • c
  • t2-t1
  • s2-s1
Answer: z1-z2
Q17 | If the two reservoirs are kept at the same level, the head loss is                
  • z1-z2
  • zero
  • t2-t1
  • s2-s1
Answer: zero
Q18 | How do we determine the total discharge through parallel pipes?
  • add them.
  • subtract them
  • multiply them
  • divide them
Answer: add them.
Q19 | The pipe diameter is                  
  • directly proportional to fluid density
  • directly proportional to mass flow rate
  • inversely proportional to mass flow rate
  • directly proportional to fluid velocity
Answer: directly proportional to mass flow rate
Q20 | Define Viscosity.
  • resistance to flow of object
  • resistance to flow of air
  • resistance to flow of fluid
  • resistance to flow of heat
Answer: resistance to flow of fluid
Q21 | Coefficient of friction of a laminar flow is                   
  • re/16
  • re/64
  • 16/re
  • 64/re
Answer: 16/re
Q22 | 1 NEED FOR DIMENSIONAL ANALYSIS - METHODS OF DIMENSIONAL ANALYSIS
  • botanical science
  • zoological science
  • chemistry
  • physics
Answer: chemistry
Q23 | Quantum physics deals with macroscopic phenomena.
  • true
  • false
Answer: false
Q24 | Which of the following uses electromagnetic waves?
  • radio
  • radiotherapy
  • detecting fractures
  • electric motors
Answer: radio
Q25 | Which is the universal attractive force?
  • electromagnetic force
  • strong nuclear force
  • weak nuclear force
  • gravitational force
Answer: gravitational force
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