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e-Quiz on Heat Transfer
Each question carries 2 Marks
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1)
Unit of the rate of heat transfer is
*
2 points
Joule
Newton
Pascal
Watt
2)
Negative sign in Fourier heat conduction equation indicates
*
2 points
Heat always flow is in the direction of positive temperature gradient
Heat always flow in the direction of negative temperature gradient
No heat flow is there
Data is insufficient
3)
Fourier law of heat conduction is represented by
*
2 points
Q = -k A dt /dx
Q = k A dx/d t
Q = -k A (T1-T2)
Q = k dt /d x
4)
Which of the following is not a method of heat transfer?
2 points
Conduction
Induction
Convection
Radiation
Clear selection
5)
Which one of the following do all methods of heat transfer require?
2 points
The movement of particles
Direct physical contact
A difference in thermal energy
A liquid or gaseous state
Clear selection
6) What is effectiveness of fin?
2 points
the ratio of actual heat transferred from fin area to the heat which would be transferred if entire fin area was at base temperature
the heat which would be transferred if entire fin area was at base temperature to the ratio of actual heat transferred from fin area
the heat which would be transferred if entire fin area was at minimum temperature to the ratio of actual heat transferred from fin area
the ratio of actual heat transferred from fin area to the heat which would be transferred if entire fin area was at minimum temperature
Clear selection
7)
Aluminum is used as a fin material because
2 points
it has higher convection heat transfer coefficient
it has higher thermal conductivity
it has lower convection heat transfer coefficient
it has lower thermal conductivity
Clear selection
8)
What is the ratio of the buoyancy force to the viscous force acting on a fluid called ?
2 points
Prandtl number (Pr)
Reynolds number (Re)
Nusselt number (Nu)
Grashof number (Gr)
Clear selection
9)
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is
2 points
Directly proportional to the surface area
Directly proportional to the difference of temperatures between the two bodies
Either (A) or (B)
Both (A) and (B)
Clear selection
10)
Reynolds number is the ratio of
2 points
Energy transferred by convection to that by conduction
Kinematic viscosity to thermal diffusivity
Inertia force to viscous force
None of the above
Clear selection
11)
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as
2 points
Conduction
Free convection
Forced convection
Radiation
Clear selection
12) What is the approximate wavelength range of thermal radiation?
2 points
0.1 to 100 μm (micronmeter)
0.1 to 100 nm (nanometer)
0.1 to 100 cm (centimeter)
none of the above
Clear selection
13) Which of the following bodies will not be able to emit radiation continuously?
2 points
a body with very high temperature placed in air medium
a body with temperature 0 oC placed in air medium
a body with temperature 0 oC placed in vacuum
none of the above
Clear selection
14) The radiation heat exchange between two bodies depends upon
2 points
the views of two surfaces with each other
the medium between the two bodies
emitting and absorbing characteristics of the bodies
all of the above
Clear selection
15) In pool boiling, as soon as the temperature of heating surface reaches the boiling point of the liquid, heat transfer takes place.
2 points
by conduction
by natural convection
by forced convection
cannot say
Clear selection
16) Generally, the convection heat transfer coefficient in drop-wise condensation is
2 points
lower than the convection heat transfer coefficient in film condensation
higher than the convection heat transfer coefficient in film condensation
equal to the convection heat transfer coefficient in film condensation
unpredictable
Clear selection
17) The automobile radiator is a heat exchanger of
2 points
Parallel flow type
Counter flow type
Cross flow type
Regenerator type
Clear selection
18) What are the compact heat exchangers?
2 points
the heat exchangers having small surface area per unit volume
the heat exchangers having large surface area per unit volume
the heat exchangers having small surface area per unit weight
the heat exchangers having large surface area per unit weight
Clear selection
19) What is the ratio of the buoyancy force to the viscous force acting on a fluid called?
2 points
Prandtl number (Pr)
Reynolds number (Re)
Grashof number (Gr)
Nusselt number (Nu)
Clear selection
20) Which surface can be best described as a radiation shield?
2 points
the surface which has very high absorptivity
the surface which has very high transmissivity
the surface which has very high reflectivity
none of the above
Clear selection
Name (as required on Certificate)
*
Your answer
Institution/ Company Name
*
Your answer
Category
*
Students
Faculty
Others
1)
Unit of the rate of heat transfer is
*
2 points
Joule
Newton
Pascal
Watt
2)
Negative sign in Fourier heat conduction equation indicates
*
2 points
Heat always flow is in the direction of positive temperature gradient
Heat always flow in the direction of negative temperature gradient
No heat flow is there
Data is insufficient
3)
Fourier law of heat conduction is represented by
*
2 points
Q = -k A dt /dx
Q = k A dx/d t
Q = -k A (T1-T2)
Q = k dt /d x
4)
Which of the following is not a method of heat transfer?
2 points
Conduction
Induction
Convection
Radiation
Clear selection
5)
Which one of the following do all methods of heat transfer require?
2 points
The movement of particles
Direct physical contact
A difference in thermal energy
A liquid or gaseous state
Clear selection
6) What is effectiveness of fin?
2 points
the ratio of actual heat transferred from fin area to the heat which would be transferred if entire fin area was at base temperature
the heat which would be transferred if entire fin area was at base temperature to the ratio of actual heat transferred from fin area
the heat which would be transferred if entire fin area was at minimum temperature to the ratio of actual heat transferred from fin area
the ratio of actual heat transferred from fin area to the heat which would be transferred if entire fin area was at minimum temperature
Clear selection
7)
Aluminum is used as a fin material because
2 points
it has higher convection heat transfer coefficient
it has higher thermal conductivity
it has lower convection heat transfer coefficient
it has lower thermal conductivity
Clear selection
8)
What is the ratio of the buoyancy force to the viscous force acting on a fluid called ?
2 points
Prandtl number (Pr)
Reynolds number (Re)
Nusselt number (Nu)
Grashof number (Gr)
Clear selection
9)
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is
2 points
Directly proportional to the surface area
Directly proportional to the difference of temperatures between the two bodies
Either (A) or (B)
Both (A) and (B)
Clear selection
10)
Reynolds number is the ratio of
2 points
Energy transferred by convection to that by conduction
Kinematic viscosity to thermal diffusivity
Inertia force to viscous force
None of the above
Clear selection
11)
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as
2 points
Conduction
Free convection
Forced convection
Radiation
Clear selection
12) What is the approximate wavelength range of thermal radiation?
2 points
0.1 to 100 μm (micrometer)
0.1 to 100 nm (nanometer)
0.1 to 100 cm (centimeter)
none of the above
Clear selection
13) Which of the following bodies will not be able to emit radiation continuously?
2 points
a body with very high temperature placed in air medium
a body with temperature 0 oC placed in air medium
a body with temperature 0 oC placed in vacuum
none of the above
Clear selection
14) The radiation heat exchange between two bodies depends upon
2 points
the views of two surfaces with each other
the medium between the two bodies
emitting and absorbing characteristics of the bodies
all of the above
Clear selection
15) In pool boiling, as soon as the temperature of heating surface reaches the boiling point of the liquid, heat transfer takes place.
2 points
by conduction
by natural convection
by forced convection
cannot say
Clear selection
16) Generally, the convection heat transfer coefficient in drop-wise condensation is
2 points
lower than the convection heat transfer coefficient in film condensation
higher than the convection heat transfer coefficient in film condensation
equal to the convection heat transfer coefficient in film condensation
unpredictable
Clear selection
17) The automobile radiator is a heat exchanger of
2 points
Parallel flow type
Counter flow type
Cross flow type
Regenerator type
Clear selection
18) What are the compact heat exchangers?
2 points
the heat exchangers having small surface area per unit volume
the heat exchangers having large surface area per unit volume
the heat exchangers having small surface area per unit weight
the heat exchangers having large surface area per unit weight
Clear selection
19) What is the ratio of the buoyancy force to the viscous force acting on a fluid called?
2 points
Prandtl number (Pr)
Reynolds number (Re)
Grashof number (Gr)
Nusselt number (Nu)
Clear selection
20) Which surface can be best described as a radiation shield?
2 points
the surface which has very high absorptivity
the surface which has very high transmissivity
the surface which has very high reflectivity
none of the above
Clear selection
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