What is Fluid Mechanics?

The branch of science which deals with the study of behaviour of fluids such as liquid or gases at rest as well as in motion is called fluid mechanics. 

The fluid mechanics are further decided into three parts

1. Fluid statics: 

When we study about the fluids which are at rest is called fluid statics.

2. Fluid kinematics: When we study about the fluids which are in motion, without considering the pressure force is called fluid kinematics.

3. Fluid dynamics: The study of fluids which are in motion, considering the pressure force is called fluid dynamics.

Let’s check your grasp on the topic

1. The branch of science which deals with the study of behaviour of fluids at rest as well as in motion is called

(i) Fluid kinematics

(ii) Fluid dynamics

(iii) Fluid statics

(iv) Fluid mechanics

2. The study of fluids at rest is called fluid dynamics.

(i) True

(ii) False

3. When we go to study of fluid which is at rest without considering the pressure force is called...................

(i) Fluid statics

(ii) Fluid mechanics

(iii) Fluid kinematics

(iv) Fluid dynamics

4. Which among the following is true?

(i) Study of fluids at rest is called fluid dynamics.

(ii) Study of fluids in motion is called fluid statics.

(iii) Study of fluids at rest as well as in motion is called fluid mechanics.

(iv) Study of fluids in motion without considering its pressure force is called fluid dynamics.

Aptitude Test Questions on Air Refrigeration Cycles

1. What is unit of refrigeration?

(i) TR

(ii) PR

(iii) BR

(iv) QR

2. A tonne of refrigeration is defined as the amount of refrigeration effect produced by the uniform melting of one tonne of ice from and at 0 degree C in 24 hours.

(i) Agree

(ii) Disagree

3. The latent heat of ice is ………..

(i) 225 kJ/kg

(ii) 336 kJ/kg

(iii) 335 kJ/kg

(iv) 334 kJ/kg

4. In actual practice 1 TR is taken as equivalent to

(i) 232.6 kJ/min

(ii) 210 kJ/min

(iii) 3.5 kJ/min

(iv) 335 kJ/min

5. The C.O.P. of refrigerator is given by

(i) W/Q

(ii) Q/W

(iii) Q1/Q2

(iv) Q2/Q1

6. The ratio of actual C.O.P. to the theoretical C.O.P. is known as

(i) Relative coefficient of performance

(ii) Relative coefficient of discharge

(iii) Relative coefficient of power

(iv) Relative coefficient of cooling

7. The value of C.O.P of refrigerator is always ________ unity.

(i) Greater than

(ii) Less than

(iii) Equal to

(iv) None of the above

8. The coefficient of performance of a refrigerator is the reciprocal of the efficiency of heat engine. Is it true or false?

(i) false

(ii) true

9. find the cop of a refrigeration system if the work input is 80 kJ/kg and refrigeration effect produced is 160 kJ/kg of refrigerant flowing.

(i) 1

(ii) 3

(iii) 0.5

(iv) 2

10. In a refrigerating machine, heat rejected is _______ than heat absorbed.

(i) less

(ii) more

(iii) equal

(iv) none of the above

Answers: 

1.(i), 2.(i), 3.(iii), 4.(ii), 5.(ii), 6.(i), 7.(i), 8.(ii), 9.(iv), 10.(ii)