National Testing Agency
Question Paper Name : Convective Heat Transfer Fundamentals and Applications 2020 Shift 1
--- Content provided by FirstRanker.com ---
Subject Name : Convective Heat Transfer Fundamentals and Applications
Creation Date : 2020-09-15 13:26:34
Duration : 180
Total Marks : 75
Display Marks: Yes
--- Content provided by FirstRanker.com ---
Share Answer Key With Delivery Engine : Yes
Actual Answer Key : Yes
Convective Heat Transfer Fundamentals and Applications
Group Number : 1
Group Id : 8995146
--- Content provided by FirstRanker.com ---
Group Maximum Duration : 0
Group Minimum Duration : 120
Show Attended Group? : No
Edit Attended Group? : No
Break time : 0
--- Content provided by FirstRanker.com ---
Group Marks : 75
Is this Group for Examiner? : No
Convective Heat Transfer Fundamentals and Applications
Section Id : 8995146
Section Number : 1
--- Content provided by FirstRanker.com ---
Section type : Online
Mandatory or Optional : Mandatory
Number of Questions : 75
Number of Questions to be attempted : 75
Section Marks : 75
--- Content provided by FirstRanker.com ---
Display Number Panel : Yes
Group All Questions: Yes
Mark As Answered Required? : Yes
Sub-Section Number : 1
Sub-Section Id : 8995146
--- Content provided by FirstRanker.com ---
Question Shuffling Allowed : Yes
Question Number : 1 Question Id : 899514441 Question Type : MCQ Option Shuffling : No Display Question Number: Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
General motion of a fluid particle consists of the following
--- Content provided by FirstRanker.com ---
(A) Translation only
(B) Linear deformation only
(C) Rotation only
(D) Translation, linear deformation, rotation and angular deformation
Question Number : 2 Question Id : 899514442 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
? ? Cross derivatives like (u is the velocity in the x-direction and v is ?'? the y-direction) cause the fluid element to
(A) Undergo linear deformation
(B) Undergo Translation
--- Content provided by FirstRanker.com ---
(C) Rotate and undergo angular deformation
(D) Linear deformation and translation
Question Number : 3 Question Id : 899514443 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
--- Content provided by FirstRanker.com ---
For an incompressible steady flow, the continuity equation is given by
? ? ? (A) [+u+ve+wa+pa++) = 0
? ? ? W
? ? ? (B)+u+vol+w] = 0
?
--- Content provided by FirstRanker.com ---
W = 0
? ? ? (C) [u+vol+w]
? ?
? ? dw (D) + + = 0
?
--- Content provided by FirstRanker.com ---
?
dz
Question Number : 4 Question Id : 899514444 Question Type : MCQ Option Shuffling : No Display Question Number: Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
--- Content provided by FirstRanker.com ---
Body forces acting on the fluid element are caused by
(A) Normal stresses, shear stresses and pressure acting on the fluid element
(B) Gravity forces, normal stresses, shear stresses acting on the fluid
(C) Shear stresses, Coriolis force, centrifugal force acting on the fluid
(D) Gravity forces, Coriolis forces and centrifugal forces acting on
--- Content provided by FirstRanker.com ---
Question Number : 5 Question Id : 899514445 Question Type : MCQ Option Shuffling : No Display Question Number: Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
Non-dimensionalisation of the energy equation results in the following numbers
(A) Reynolds number, Prandtl number and Eckert number
--- Content provided by FirstRanker.com ---
(B) Reynolds number and Prandtl number
(C) Reynolds number and Eckert number
(D) Prandtl number and Eckert number
Question Number : 6 Question Id : 899514446 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
--- Content provided by FirstRanker.com ---
Correct Marks : 1 Wrong Marks : 0
For high speed supersonic flows (high Mach number flows), the following dimensional numbers are important
(A) Reynolds number, Prandtl number and Eckert number
(B) Reynolds number and Prandtl number
(C) Reynolds number and Eckert number
--- Content provided by FirstRanker.com ---
(D) Prandtl number and Eckert number
Question Number : 7 Question Id : 899514447 Question Type : MCQ Option Shuffling : No Display Question Number: Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
In the buffer layer (overlap layer) of the three layer structure of the body following statement is true
--- Content provided by FirstRanker.com ---
(A) Laminar shear stress (Tlam) >>> Turbulent shear stress (Tturb)
(B) Laminar shear stress Tlam ~ Turbulent shear stress (Tturb)
(C) Laminar shear stress Tlam<<< Turbulent shear stress (Tturb )
(D) None of the above
Question Number : 8 Question Id : 899514448 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
1
= 2.0log(Revf) – 0.8 is derived on the basis of
vf
--- Content provided by FirstRanker.com ---
(A) Universal velocity distribution and drawing constants from experiment
(B) Purely experimental results (empirical approach)
(C) Purely on the basis of universal velocity distribution
(D) None of the above
Question Number : 9 Question Id : 899514449 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
1
e
= 2.0log() is applicable for
--- Content provided by FirstRanker.com ---
vf
3.7
(A) Fully developed Laminar flow and hydraulically smooth pipe
(B) Fully developed Laminar flow and hydraulically rough pipe
(C) Fully developed Turbulent flow and hydraulically smooth pipe
--- Content provided by FirstRanker.com ---
(D) Fully developed Turbulent flow and hydraulically rough pipe
Question Number : 10 Question Id : 899514450 Question Type : MCQ Option Shuffling : No Display Question Number: Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
A pipe is said to be hydraulically rough pipe, if the following condition is satisfied
--- Content provided by FirstRanker.com ---
(A) Roughness elements are geometrically small enough that they can be in viscous sublayer
(B) It is the geometrical roughness which matters, but not the viscous thickness
(C) Roughness elements are geometrically large enough, they break the viscous sublayer
(D) None of the above
Question Number : 11 Question Id : 899514451 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
In a hydraulically rough pipe, the friction factor in a fully developed turbulent function of
(A) Reynolds number and geometrical roughness
(B) Reynolds number only
--- Content provided by FirstRanker.com ---
(C) Geometrical roughness only
(D) Independent of both Reynolds number and geometrical roughness
Question Number : 12 Question Id : 899514452 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
--- Content provided by FirstRanker.com ---
The fluctuating component of the velocity in a turbulent flow is measured by
(A) Pitot tube and manometer
(B) Hot wire anemometer
(C) Pitot tube alone
(D) None of the above
--- Content provided by FirstRanker.com ---
Question Number : 13 Question Id : 899514453 Question Type : MCQ Option Shuffling: No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
In external and internal flows, the solution of the mass and momentum equation velocity distribution and pressure. This information is used to calculate the
(A) Hydrodynamic boundary layer thickness and skin friction coefficient
--- Content provided by FirstRanker.com ---
(B) Hydrodynamic boundary layer thickness alone
(C) Skin friction coefficient alone
(D) None of the above
Question Number : 14 Question Id : 899514454 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
--- Content provided by FirstRanker.com ---
Correct Marks : 1 Wrong Marks : 0
Consider flow over a flat plate with a Reynolds number of 10000 maintained at constant wall temperature, the essential condition for satisfying analogy is as follows
(A) Prandtl number is to be lower than unity
(B) Prandtl number is to be greater than unity
(C) Prandtl number is required to be unity
--- Content provided by FirstRanker.com ---
(D) None of the above
Question Number : 15 Question Id : 899514455 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
Consider a vertical hot body immersed in a quiescent cold fluid in which steady and natural convection is laminar. Non-dimensionalisation of the equation results in the following non-dimensional numbers
--- Content provided by FirstRanker.com ---
(A) Grashoff number and Reynolds number
(B) Grashoff number, Reynolds number and Prandtl number
(C) Reynolds number and Prandtl number
(D) Reynolds number, Grashoff number and Eckert number
Question Number : 16 Question Id : 899514456 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
Consider natural convection for either internal flow or external flow following statement is correct
(A) Momentum equation and energy equation are uncoupled
(B) Momentum equation and energy equation are coupled
--- Content provided by FirstRanker.com ---
(C) Velocity profile can be obtained from momentum equation and temperature profile can be obtained from energy equation
(D) Velocity profile and temperature profile can be obtained by solving equation
Question Number : 17 Question Id : 899514457 Question Type : MCQ Option Shuffling: No Display Question Number: Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
--- Content provided by FirstRanker.com ---
Consider natural convection for vertical hot plates, the critical Grashoff number
(A) Around 2 × 105
(B) Around 2300
(C) Around 100
(D) Around 109
--- Content provided by FirstRanker.com ---
Question Number : 18 Question Id : 899514458 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For high Prandtl number fluids, in natural convection for external surface thermal boundary layer, it is the balance of the following forces
(A) Inertia force and friction force
--- Content provided by FirstRanker.com ---
(B) Inertia force and Buoyancy force
(C) Friction force and buoyancy force
(D) Inertia forces, Friction force and Buoyancy force
Question Number : 19 Question Id : 899514459 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
--- Content provided by FirstRanker.com ---
Correct Marks : 1 Wrong Marks : 0
Consider natural convection around a vertical hot plate maintained at constant temperature surrounded by a low Prandtl number fluid, the scale of the thermal layer is
(A) HRAH
1
1
--- Content provided by FirstRanker.com ---
(B) HRa
1
1
(C) HRa1*Pr¯¯
1
--- Content provided by FirstRanker.com ---
1
(D)HRa1²Pr¯¯
where H is the height of the vertical plate and RaH is the Rayleigh number the height of the vertical plate
Question Number : 20 Question Id : 899514460 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
--- Content provided by FirstRanker.com ---
Correct Marks : 1 Wrong Marks : 0
Consider natural convection around a vertical hot plate maintained temperature surrounded by a high Prandtl number fluid, the scale of the is
(A) Ra
(B) Ra
1
--- Content provided by FirstRanker.com ---
H
1
2
?
(C) RaPr
--- Content provided by FirstRanker.com ---
1
1-4
(D) RaPr
1-2
where H is the height of the vertical plate and RaH is the Rayleigh number the height of the vertical plate
--- Content provided by FirstRanker.com ---
Question Number : 21 Question Id : 899514461 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
Which of the following statement is TRUE?
(A) a radiation analysis should normally accompany a natural convection unless the emissivity of the surface is low
--- Content provided by FirstRanker.com ---
(B) a radiation analysis should normally accompany a natural convection unless the emissivity of the surface is high
(C) radiation analysis may be neglected during natural convection irrespective of the emissivity of the surface
(D) None of the above
Question Number : 22 Question Id : 899514462 Question Type : MCQ Option Shuffling: No Display Question Number: Yes
Line Question Option : No Option Orientation : Vertical
--- Content provided by FirstRanker.com ---
Correct Marks : 1 Wrong Marks : 0
The assumptions involved in the Nusselt condensation are as follows
(A) Laminar flow and constant properties are assumed for the liquid
(B) Gas is assumed to be pure vapour and at a uniform temperature equal
(C) Shear stress at the liquid-vapour interface is assumed to be negligible
--- Content provided by FirstRanker.com ---
(D) All of the above
Question Number : 23 Question Id : 899514463 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
In the Nusselt condensation, it is the balance of the following forces
--- Content provided by FirstRanker.com ---
(A) Inertia force, sinking effect (force) and friction force
(B) Inertia force and friction force
(C) Friction force and sinking effect (force)
(D) Inertia force and sinking effect (force)
Question Number : 24 Question Id : 899514464 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For a flow over a flat plate with no suction/blowing, constant u8and case of Pr > 1, the flow field is split into the following three regions:
Region I: 0 = y = 8t
Region II: dt = y = d
--- Content provided by FirstRanker.com ---
Region III: y = d
Which of the following is TRUE for Region III?
(A) u(x, y) < u8 and T(x,y) < T8
(B) u(x, y) = u and T(x,y) = T8
(C) u(x, y) < u8 and T(x,y) > T8
--- Content provided by FirstRanker.com ---
(D) u(x, y) = u and T(x,y) > T8
Question Number : 25 Question Id : 899514465 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For a flow over a flat plate with no suction/blowing, constant u8and case ofPr ~ 1, what can you say about the flow field?
--- Content provided by FirstRanker.com ---
(A) 0 = y = (d or d1) for u = u8 and T > T8
(B) 0 = y = (d ? d1) for u < u8 and T > To8
(C) 0 = y = (d or dt) for u < u8 and T = T8
(D) 0 = y = (8 or 8t) for u > u and T = T8
Question Number : 26 Question Id : 899514466 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For a flow over a flat plate with no suction or blowing, constant u
u
y
--- Content provided by FirstRanker.com ---
profile is - = a + by + cn² where, (? = ); the values of a, b, c are
U8
d(x)
(A) 1, -1, -2
(B) 0, 1, -2
--- Content provided by FirstRanker.com ---
(C) 0, -1, 2
(D) 0, 2, -1
Question Number : 27 Question Id : 899514467 Question Type : MCQ Option Shuffling: No Display Question Number: Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
--- Content provided by FirstRanker.com ---
For a flow over a flat plate with no suction or blowing, constant u
u
y
profile is = 2? – ?² where, (? = ); displacement thickness is:
Uoo
--- Content provided by FirstRanker.com ---
d(x)
28
(A)
3
(B)
--- Content provided by FirstRanker.com ---
d
3
2
(C)
3
--- Content provided by FirstRanker.com ---
1
(D)
3
Question Number : 28 Question Id : 899514468 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
--- Content provided by FirstRanker.com ---
Correct Marks : 1 Wrong Marks : 0
For a flow over a flat plate with no suction or blowing, constant u8, if the
u
y
is- = 2? – ?² where, (? = ); the momentum thickness 82 is:
--- Content provided by FirstRanker.com ---
U8
d(x)
2
(A)
3
--- Content provided by FirstRanker.com ---
28
3
(B)
28
15
--- Content provided by FirstRanker.com ---
(C)
2
15
(D)
Question Number : 29 Question Id : 899514469 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
u
y
Tw-T(x,y)
--- Content provided by FirstRanker.com ---
For the velocity profile = 2? – ?² and = ?t
Uoo
Tw-Too
?); for Pr = 1, the enthalpy thickness is equal to:
d(x)
--- Content provided by FirstRanker.com ---
dt(x)
88
(A)
15
28
--- Content provided by FirstRanker.com ---
(B)
15
(C) 0
(D) dt
Question Number : 30 Question Id : 899514470 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For laminar flow through a circular pipe of radius R, the velocity distribution
r
u(x) = c [1-2] (where, c is a constant), the bulk mean velocity is:
--- Content provided by FirstRanker.com ---
R
C
(A)
3
C
--- Content provided by FirstRanker.com ---
(B)
2
(C) c
2c
(D)
--- Content provided by FirstRanker.com ---
3
Question Number : 31 Question Id : 899514471 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For laminar flow through a circular pipe of radius R, the velocity distributions are given by u(r) = C and T(r) = D[1-2] respectively and D are constants), the bulk mean temperature is:
--- Content provided by FirstRanker.com ---
r
R
4D
(A)
5
--- Content provided by FirstRanker.com ---
2D
(B)
3
D
(C)
--- Content provided by FirstRanker.com ---
2
(D) D
Question Number : 32 Question Id : 899514472 Question Type : MCQ Option Shuffling: No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
--- Content provided by FirstRanker.com ---
For flow over a flat plate, the flow velocity is decreased by a factor of other variables constant in case of a laminar flow, the boundary
(A) Increases by a factor of 2
(B) Decreases by a factor of 2
(C) Increases by a factor of 4
(D) Decreases by a factor of 4
--- Content provided by FirstRanker.com ---
Question Number : 33 Question Id : 899514473 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For a flow over a flat plate, the free stream velocity is increased by a factor all other variables constant. If fluid has Pr << 1, which of the following is
(A) 8 and 8t both decrease
--- Content provided by FirstRanker.com ---
(B) 8 and 8t both increase
(C) & decreases and dremains unchanged
(D) 8 remains unchanged and dedecreases
Question Number : 34 Question Id : 899514474 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
--- Content provided by FirstRanker.com ---
Correct Marks : 1 Wrong Marks : 0
If blowing velocity is increased, boundary layer thickness
(A) remains unchanged
(B) increases
(C) decreases
--- Content provided by FirstRanker.com ---
(D) changes randomly
Question Number : 35 Question Id : 899514475 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For the case of thin thermal boundary layer (de « d) over a flat plate number is given by Nux~Re/2Pr¹³/3. For a fixed location in the flow- number is increased from 1600 to 2500, the ratio of the old to the new Nu that location would be
--- Content provided by FirstRanker.com ---
1
1
(A) 16:25
(B) 25:16
(C) 5:4
--- Content provided by FirstRanker.com ---
(D)4:5
Question Number : 36 Question Id : 899514476 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For a circular pipe whose diameter decreases linearly along the flow direction mass flow rate and constant properties, the Reynolds Number of flow flow direction.
--- Content provided by FirstRanker.com ---
(A) Remains constant
(B) Decreases
(C) Increases
(D) Depends on fluid
Question Number : 37 Question Id : 899514477 Question Type : MCQ Option Shuffling : No Display Question Number : Yes
--- Content provided by FirstRanker.com ---
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For a circular pipe whose diameter decreases linearly along the flow direction mass flow rate and constant properties, the bulk mean velocity a direction.
(A) Remains constant
(B) Decreases
--- Content provided by FirstRanker.com ---
(C) Increases
(D) Depends on Prandtl number
Question Number : 38 Question Id : 899514478 Question Type : MCQ Option Shuffling : No Display Question Number: Yes
Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
--- Content provided by FirstRanker.com ---
Arrange the phenomenon according decreasing values of heat transfer associated with them.
P. Natural convection in water
This download link is referred from the post: ARPIT Last 10 Years 2011-2021 Previous Question Papers
--- Content provided by FirstRanker.com ---