MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
Quiz
Chemical Engineering
Fluid Mechanics
Quiz 12
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Q.1
Experimental study of laminar fluid flow through a circular tube was conducted by
Reynolds
Hagen and Poiseuille
Pascal
Blake-Plummer
Q.2
Centrifugal pump is normally classified on the basis of the
Rpm
Type of casing
Impeller blade angle
Number of blades in impeller
Q.3
The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is
0.5
1
2
0.33
Q.4
For the free settling of a spherical particle through a fluid, the slope of, C
D
-log N
Re
, plot is
1
-1
0.5
-0.5
Q.5
Various efficiencies of a centrifugal pump are related as (where, η
m
= mechanical efficiency η
v
= volumetric efficiency. η
ma
= manometric efficiency η
o
= overall efficiency)
η
ma
x η
m
x η
v
= η
o
η
m
= η
v
. η
ma
η
ma
= η
m
x η
v
η
v
= η
m
x η
ma
Q.6
Check valves are used
At high pressure
In bends
For controlling water flow
For unidirectional flow
Q.7
For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.
Brings about no further reduction of
Increases
Decreases
None of these
Q.8
Boundary layer exists in flow
Of real fluids
Over flat surfaces only
In pipes only
Of ideal fluids only
Q.9
Buoyant force
For non-symmetrical bodies is not vertical
Depends on the depth of the submergence of the floating body
Depends on the weight of the floating body
None of these
Q.10
The line of action of the buoyant force acts through the
Centroid of the displaced volume of fluid
Centre of gravity of a submerged body
Centroid of the volume of any floating body
None of these
Q.11
Which of the following can be used to create a flow of gas, where no significant compression is required?
Reciprocating compressor
Blower
Axial flow compressor
Centrifugal compressor
Q.12
Choking in case of pipe flow means that a
Specified mass flow rate can not be achieved
Valve is closed in the line
Restriction in flow cross-section area occurs
None of these
Q.13
Cavitation can be prevented by
Suitably designing the pump
Maintaining the suction head sufficiently greater than the vapour pressure
Maintaining suction head = developed head
Maintaining suction head lower than the vapour pressure
Q.14
The Reynolds number for an ideal fluid flow is
4
2100-4000
4000
∞
Q.15
What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides change?
Rotation
Translation
Linear deformation
Angular deformation
Q.16
A hydraulic accumulator comprises of
A storage device and a control valve
A cylinder and a plunger
Two pistons and two cylinders
A storage tank and a ram pump
Q.17
It is possible to integrate an automatic flow controller to a
Flow nozzle
Venturimeter
Rotameter
None of these
Q.18
Cocks are used to control
Water
Any liquid
Solids
None of these
Q.19
In a dry packed bed, the pressure drop will be changed by increasing the flow rate as
V
1.8
V
-0.8
V
V-1
Q.20
Identification of pipelines carrying different liquids and gases is done by the __________ of the pipe.
Diameter
Colour
Altitude
None of these
Q.21
Pascal law is not applicable for a/an __________ fluid.
Accelerating frictionless
Static
Uniformly moving
None of these
Q.22
A globe valve is the most suitable for applications, in which
Fluid flow control is required
Fluid contains dispersed solid particles
Valve is required to be either fully open or fully closed
One way flow is required
Q.23
Fanning equation is given by ∆p/ρ = 4f. L/D . v²/2g<.sub>c . It is applicable to __________ region flow.
Transition
Laminar
Turbulent
Both B and C
Q.24
The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm².
1000
2000
3000
4000
Q.25
Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε
0
) with age/time (t) (where, ε = roughness of the surface after time't'. α = a co-efficient to be experimentally determined)?
ε = ε
0
+ α.t
ε = ε
0
+ α.t²
ε = ε
0
+ α.t³
ε = ε
0
+ α.t⁴
Q.26
The capacity of a centrifugal pump Can be increased by increasing the
Impeller diameter or speed
Number of pumps and joining them in series
Number of pumps and joining them in parallel
All of the above
Q.27
Hydraulic diameter for non-circular ducts is equal to __________ times the area of flow divided by the perimeter.
Two
Three
Four
Eight
Q.28
The terminal velocity of a particle moving through a fluid varies as d
p
n
. What is the value of n' for Newton's law regime?
0.5
1
1.5
3
Q.29
Quicksand is an example of a __________ fluid.
Bingham plastic
Dilatent
Newtonion
Pseudoplastic
Q.30
Drag is the force component exerted on an immersed object,
Passing the centroid of the body at 60°to the direction of motion
The component being parallel to theflow direction
The component being normal to the flow direction
None of these
Q.31
The pressure and power requirement of a gas fan at constant speed & capacity varies __________ the gas density.
Directly as
Inversely as square root of
Inversely as
As square of
Q.32
Momentum correction factor used in fluid flow problems accounts for the
Change in direction of flow
Change in total energy
Change in pressure
Non uniform direction of velocities at inlet & outlet sections
Q.33
What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)?
0.5
1
1.5
2
Q.34
Boundary layer separation is caused by the
Reduction of pressure below vapour pressure
Reduction of pressure gradient to zero
Adverse pressure gradient
Reduction of boundary layer thickness to zero
Q.35
In case of centrifugal fan or blower, the gas capacity varies as
Speed
(speed)
2
(speed)
3
(speed)
0.5
Q.36
Absolute viscosity of a fluid is a function of the __________ of the fluid.
Motion
Pressure & temperature
Shearing stress
Both B & C
Q.37
A free jet of water of cross-sectional area 0.01m² and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is
200 N
400 N
2000 N
4000 N
Q.38
In case of a pipe exit fitted with a nozzle, the
Conversion of kinetic head to pressure head is facilitated
Conversion of pressure head to kinetic head is facilitated
Power transmitted through the nozzle is maximum, when the head lost due to friction in the pipe is equal to one third of the total supply head
Both B and C
Q.39
Reynolds number is the ratio of
Viscous forces to gravity forces
Inertial forces to viscous forces
Viscous forces to inertial forces
Inertial forces to gravity forces
Q.40
The valve used for very remote and accurate control of fluid is a __________ valve.
Needle
Globe
Gate
Butterfly
Q.41
For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the
Square of the radial distance
Radial distance linearly
Inverse of the radial distance
Elevation along vertical direction
Q.42
To handle smaller quantity of fluid at higher discharge pressure, use a __________ pump.
Reciprocating
Centrifugal
Volute
Rotary vacuum
Q.43
What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition?
0.5
0.67
1
2
Q.44
With increase in the temperature, viscosity of a liquid
Increases
Decreases
Remains constant
May increase or decrease; depends on the liquid
Q.45
A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.
Newtonion
Viscous
Dilatant
Non-viscous
Q.46
Pick out the correct statement pertaining to transition/ entrance length in fluid flow.
The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length
Transition length for laminar flow of Newtonion fluids in a pipe of diameter 'd' is equal to 0.05. D.N
Re
Transition length for turbulent flow of Newtonion fluids in a smooth pipe of diameter 'd' is equal to 50 D
All of the above
Q.47
Head developed by a centrifugal pump depends on its
Speed
Impeller diameter
Both A and B
Neither A nor B
Q.48
Creeping flow around a sphere is defined, when particle Reynolds number is
< 2100
< 0.1
> 2.5
< 500
Q.49
Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds
4000
2100
1500
3000
Q.50
Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?
Decrease in effect
Increase in thrust
Develops noise
Develops high pressure
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page