Top Mechanical Engineering MCQ Questions and Answers explonations || mechanical fluid mechanics mcqs||mechadamy

Q:1) Specific gravity is what kind of property?

 

   A)    INTENSIVE PROPERTY

B) EXTENSIVE

 

 

C) NONE OF THE MENTIONED

 

 

D) IT DEPENDS ON EXTERNAL CONDITIONS

Q:2) For an incompressible fluid does density vary with temperature and pressure?

 

 

 

 

A) IT VARIES FOR ALL TEMPERATURE AND PRESSURE RANGE

 

 

B) IT REMAINS CONSTANT

 

 

C) IT VARIES ONLY FOR LOWER VALUES OF TEMPERATURE AND PRESSURE

 

 

D) IT VARIES ONLY FOR HIGHER VALUES OF TEMPERATURE AND PRESSURE

Q:3) CALCULATE THE SPECIFIC WEIGHT AND WEIGHT OF 20DM3 OF PETROL OF SPECIFIC GRAVITY 0.6.

 

 

 

 

a) 5886,117.2

  

b) 5886,234.2

 

 

c) 11772,117.2

 

 

d) None of the mentioned

Q:4 If there is bucket full of oil and bucket full of water and you are asked to lift them, which one of the two will require more effort given that volume of buckets remains same?

 

 

A) OIL BUCKET

 

 

B) WATER BUCKET

 

 

C) EQUAL EFFORT WILL BE REQUIRED TO LIFT BOTH OF THEM

 

 

D) NONE OF THE MENTIONED

Q:5) If the fluid has specific weight of 10N/m3 for a volume of 100dm3 on a planet which is having acceleration due to gravity 20m/s2 , what will be its specific weight on a planet having acceleration due to gravity 4m/s2?

 

 

 

 

a) 5 N/m3

 

 

b) 50 N/m3

 

 

c) 2 N/m3

 

 

d) 10 N/m3

Q:6) Which one of the following is not a unit of dynamic viscosity?

 

 

 

 

a) Pa-s

 

 

b) N-s/m2

 

 

c) Poise

 

 

d) Stokes

Q:7) Which of the following is a unit of kinematic viscosity?

 

 

 

 

a) Stokes

 

 

b) Pa-s

 

 

c) m2=s

 

 

d) Poise

Q:8) The kinematic viscosity of a fluid is 0.1 Stokes. What will be the value in m2/s?

 

 

 

a) 10-2

 

 

b) 10-3

 

 

c) 10-4

 

 

d) 10-5

Q:9) Find the kinematic viscosity of oil having density 1962 g/m3. the force experienced for area of 20 m2 is 4.904 kN and velocity of gradient at that point is 0.2/s.

 

 

 

 

a) 0.625

 

 

b) 1.25

 

 

c) 2.5

 

 

d) None of the mentioned

Q:10) In which types of fluids it is observed that momentum transfer dominates cohesive forces with increase in temperature and hence viscosity increases

 

 

 

a) Gases

 

 

b) Liquids

 

 

c) Solids

 

 

d) None of the mentioned

 

Q:11) What happens to viscosity in the case of incompressible fluids as temperature is increased?

 

 

 

 

a) It remains constant

 

 

b) It increases

 

 

c) It decreases

 

 

d) None of the mentioned

Q:12) If a fluid, which has a constant specific gravity, is taken to a planet where acceleration due to gravity is 3 times compared to its value on earth, what will happen to its kinematic viscosity.

 

 

a) It increases

 

 

b) It decreases

 

 

c) It remains constant

 

 

d) None of the above

Q:13 In liquids in order to measure the viscosity of fluid experimentally we consider the variation of shear stress with respect to what property?

 

 

a) strain

 

 

b) shear strain

 

 

c) rate of shear strain

 

 

d) none of the mentioned

Q:14) Which of the following machines have the possibility of cavitation?

 

 

 

 

a) Reaction turbines and centrifugal pumps

 

 

b) Reaction turbines and reciprocating pumps

 

 

c) Impulse turbines and centrifugal pumps

 

 

d) Impulse turbines and reciprocating pumps

Q:15) The value of the bulk modulus of elasticity for an incompressible fluid is

 

 

 

 

a) zero

 

 

b) unity

 

 

c) infinity

 

 

d) very low

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