Fluid Mechanics And Machinery Set 3

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 3

Q1 | 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
Explaination:
total head loss for a system is equal to the height difference of the reservoirs. height difference is denoted by the letter ‘h’. total head loss can be equated
Q2 | that is developed in the pipe?
  • entry
  • exit
  • connection between two pipes
  • liquid velocity
Answer: liquid velocity
Explaination:
liquid velocity in the pipe is the velocity with which the liquid travels through different cross sections of the pipe. it is a vector field which is used to describe the motion of a continuum. the length of flow velocity vector is equal to the flow speed.
Q3 | Which among the following is the correct formula for head loss?
  • z1-z2
  • c
  • t2-t1
  • s2-s1
Answer: z1-z2
Explaination:
total head loss for a system is equal to the height difference of the reservoirs. height difference is denoted by the letter ‘h’. total head loss can be equated
Q4 | If the two reservoirs are kept at the same level, the head loss is  
  • z1-z2
  • zero
  • t2-t1
  • s2-s1
Answer: zero
Explaination:
total head loss for a system is equal to the height difference of the reservoirs. height difference is denoted by the letter ‘h’. the height difference between the reservoirs is z1-z2. since they are of the same level, z1=z2. therefore, head loss is zero.
Q5 | How do we determine the total discharge through parallel pipes?
  • add them.
  • subtract them
  • multiply them
  • divide them
Answer: add them.
Explaination:
total discharge in parallel pipes are determined by adding the discharges so developed in individual pipes. if q1 is the discharge through pipe 1 and q2 is the discharge through pipe 2. then the total discharge through parallel pipes is equal to
Q6 | 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
Explaination:
the pipe diameter is directly
Q7 | 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
Explaination:
viscosity is developed due to the relative motion between two surfaces of fluids at different velocities. it happens due to the shear stress developed on the surface of the fluid.
Q8 | Coefficient of friction of a laminar flow is 
  • re/16
  • re/64
  • 16/re
  • 64/re
Answer: 16/re
Explaination:
coefficient of friction is defined as the value that shows relationship between force and the normal reaction. it is mainly used to find out an object’s normal force and frictional force. thus, it is equal to 16/re.
Q9 | TOPIC 3.1 NEED FOR DIMENSIONAL ANALYSIS - METHODS OF DIMENSIONAL ANALYSIS
  • botanical science
  • zoological science
  • chemistry
  • physics
Answer: chemistry
Explaination:
chemistry is the science that deals with every substance, its structure, its composition and changes. physics is the study of the natural world, matter, energy and radiation, while biology is the science that deals with the behaviour of living things are called biological sciences.
Q10 | Quantum physics deals with macroscopic phenomena.
  • true
  • false
Answer: false
Explaination:
classical physics deals with macroscopic phenomena which may be at the laboratory, terrestrial and astronomical.
Q11 | Which of the following uses electromagnetic waves?
  • radio
  • radiotherapy
  • detecting fractures
  • electric motors
Answer: radio
Explaination:
electromagnetic waves are used in the radio. while radiotherapy and detecting fractures are done by x-rays and electric motor comes under the electric appliance.
Q12 | Which is the universal attractive force?
  • electromagnetic force
  • strong nuclear force
  • weak nuclear force
  • gravitational force
Answer: gravitational force
Explaination:
gravitational force is the force
Q13 | Gravitational force is the weakest force in nature.
  • true
  • false
Answer: true
Explaination:
gravitational force is the weakest force in nature because it cannot be felt by us on daily basis. electromagnetic force is the strongest force in nature.
Q14 | Which of the following is an example of electromagnetic force?
  • motion of moon around earth
  • evolution of stars
  • evolution of galaxies
  • compression of spring
Answer: compression of spring
Explaination:
when a spring is compressed, it exerts a force of elasticity due to the net repulsion/ attraction between the
Q15 | Why is climbing a lamp post harder than climbing up a tree?
  • because of parallel friction force
  • because of contact force between the bodies
  • because of van der wall’s force
  • because of rope force
Answer: because of parallel friction force
Explaination:
sometimes, the electromagnetic contact force between two bodies may have a component acting parallel to the surface of contact. this is called friction. when bodies are placed with their smooth surfaces in contact, they provide only a small parallel component of contact of force and hence
Q16 | Gravitational force, despite being a weak force, governs the large scale motion.
  • true
  • false
Answer: true
Explaination:
mass is only of one type. so the gravitational force is always attractive.
Q17 | When a body is falling freely under gravity, the total mechanical energy remains constant because of which of the following?
  • law of conservation of energy
  • unification of force
  • electromagnetic force
  • gravity
Answer: law of conservation of energy
Explaination:
according to the law of conservation of energy, energy can neither be created nor can it be destroyed but it can be changed from one form to another. when a body falls freely, under gravity, its potential energy gradually changes into kinetic energy. but its total mechanical energy remains constant at any point of its motion.
Q18 | What happens when a bullet is fired from a rifle?
  • the rifle becomes weightless
  • we fall back
  • rifle gives backward kick
  • bullet doesn’t leave the rifle
Answer: rifle gives backward kick
Explaination:
a rifle gives a backward kick on firing a bullet. before firing, both the
Q19 | Similitude is a concept applicable to the testing of  
  • mathematical models
  • physical models
  • engineering models
  • chemical models
Answer: engineering models
Explaination:
similitude is an essential concept that is applicable to the testing of basic engineering models. a model has a similitude with a real-time application. it shares the same geometry. similarity and similitude are interchangeable at times.
Q20 | Which among the following is the main application for Similitude?
  • ships
  • cars
  • hydraulics
  • train
Answer: hydraulics
Explaination:
similitude plays an important role in various applications. one of the major applications are hydraulics and aerospace engineering. its main purpose is to test the fluid flow at different conditions of scaled model.
Q21 | A model of with same shape is 
  • geometric similarity
  • kinematic similarity
  • dynamic similarity
  • conditional similarity
Answer: geometric similarity
Explaination:
geometric similarity is a similarity that follows a real-time application. it is model that has the same shape for any sort of application. it is measured in scaled quantities.
Q22 | Which among the following have similar fluid streamlines?
  • geometric similarity
  • kinematic similarity
  • dynamic similarity
  • conditional similarity
Answer: kinematic similarity
Explaination:
in kinematic similarity, fluid flow of model and real-time application takes place. here, the model and the real application must undergo similar time rates in motion changes. thus, it has similar fluid streamlines.
Q23 | Which among the following have the same forces acting on them?
  • geometric similarity
  • kinematic similarity
  • dynamic similarity
  • conditional similarity
Answer: dynamic similarity
Explaination:
dynamic similarities have the same forces acting on them. that means, the ratios of all the forces acting on the fluid particles are constant. also, the ratio of the
Q24 | All the parameters in a similitude are described using 
  • continuum mechanics
  • solid mechanics
  • diesel mechanics
  • aircraft mechanics
Answer: continuum mechanics
Explaination:
a branch of mechanics that deals with the analysis of mechanical behaviour of materials and kinematics of materials. they are used for modelling purposes. it is modelled in continuous mass.
Q25 | Physical similitude has exactly the same geometric shape of the prototype.
  • true
  • false
Answer: true
Explaination:
physical similitude is also called the similitude of shape. it is for modelling the same geometric shape as that of its prototype. which means, that the shape will have to be divided by a scale factor.
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