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Home » Engineering » Aptitude Test - 29
Hassan
1.The characteristic dimension d in the relation R E = V d p/δ is the equivalent diameter and is defined as how many times the cross-sectional flow area divided by the wetted perimeter
A. 4
B. 6
C. 8
D. 4
2.For a duct of rectangular cross-section with length l and breadth b, the value of d e is?
A. 4 l b / l + b
B. 2 l b / l + b
C. 2 l b
D. 4 l b / l + b
3.If an annulus has an inner diameter of d 1 and an outer diameter of d 2 then the equivalent diameter is?
A. d 2 – d 1
B. d 1 – d 2
C. d 2 – 2 d 1
D. d 2 – d 1
4.The ratio of inertia force to viscous force is known as?
A. Nusselt number
B. Fourier number
C. Reynolds number
D. Nusselt number
5.Velocity within the given fields would be similar in magnitude, direction and turbulence pattern when?
A. Reynolds number are same
B. Reynolds number are different
C. Nusselt number are same
D. Reynolds number are same
6.Reynolds number is given by the quantity?
A. 4 p V l/δ
B. 3 p V l/δ
C. 2 p V l/δ
D. 4 p V l/δ
7.Consider the above problem, find the convective heat flow coefficient?
A. 54.71 W/m2 K
B. 44.71 W/m2 K
C. 34.71 W/m2 K
D. 54.71 W/m2 K
8.For laminar flow, Reynolds number should be?
A. Less than 4300
B. Greater than 2300
C. Equal to 2300
D. Less than 4300
9.For turbulent flow, Reynolds number must be?
A. Greater than 6000
B. Less than 6000
C. Equal to 6000
D. Greater than 6000
10.What is the value of convective coefficient of air and super heated steam in case of forced convection?
A. 30-400 W/m2 K
B. 30-300 W/m2 K
C. 30-700 W/m2 K
D. 30-400 W/m2 K
11.For transient flow, the value of Reynolds number may vary between?
A. 6000-9000
B. 2300-6000
C. 1200-4500
D. 6000-9000
12.Conduction plus fluid flow in motion is known as?
A. Heat exchanger
B. Convection
C. Conduction
D. Heat exchanger
13.How many types of convection are there?
A. 3
B. 6
C. 9
D. 3
14.Which of the following heat flow situations pertains to free or natural convection?
A. Cooling of billets in atmosphere
B. Cooling of internal combustion engine
C. Flow of water inside the condenser tubes
D. Cooling of billets in atmosphere
15.Mark the system where heat transfer is given by forced convection?
A. Heat exchange on the outside of cold and warm pipes
B. Heat flow from a hot pavement to surrounding atmosphere
C. Fluid passing through the tubes of a condenser and other heat exchange equipment
D. Heat exchange on the outside of cold and warm pipes
16.Forced convection in a liquid bath is caused by?
A. Flow of electrons in a random fashion
B. Density difference brought about by temperature gradients
C. Molecular energy interactions
D. Flow of electrons in a random fashion
17.A finned tube hot water radiator with a fan blowing air over it is kept in rooms during winter. The major portion of the heat transfer from the radiation is due to?
A. Convection to the air
B. Better conduction
C. Radiation to the surroundings
D. Convection to the air
18.On a summer day, a scooter rider feels more comfortable while on the move than while at a stop light because?
A. Air is transparent to radiation and hence it is cooler than the body
B. More heat is loss by convection and radiation while in motion
C. Air has a low specific heat and hence it is cooler
D. Air is transparent to radiation and hence it is cooler than the body
19.What is the value of convective coefficient of oil in case of forced convection?
A. 160-3000 W/m2 K
B. 60-3000 W/m2 K
C. 460-3000 W/m2 K
D. 160-3000 W/m2 K
20.Which quantity signifies the ratio of temperature gradient at the surface to a reference temperature gradient?
A. Stanton number
B. Fourier number
C. Nusselt number
D. Stanton number
21.Nusselt number is given by?
A. 4 h l/k
B. 3 h l/k
C. 2 h l/k
D. 4 h l/k
22.The temperature profile at a particular location in a thermal boundary layer is prescribed by n expression of the form
A. 4 B k/ (t s – t infinity)
B. 3 B k/ (t s – t infinity)
C. 2 B k/ (t s – t infinity)
D. 4 B k/ (t s – t infinity)
23.Consider the above problem, calculate the temperature gradient at the surface?
A. – 14636 degree Celsius/m
B. – 24636 degree Celsius/m
C. – 34636 degree Celsius/m
D. – 14636 degree Celsius/m
24.At the interface of solid body, heat flows by conduction and is given by?
A. h A
B. h (t s – t infinity)
C. h A (t s – t infinity)
D. h A
25.For a given value of Nusselt number, the convective surface coefficient h is directly proportional to?
A. Density
B. Thermal conductivity
C. Mass
D. Density
26.What is the dimension of heat?
A. M L T -2
B. M L 2 T -1
C. M L T 2
D. M L T -2
27.What is the dimension of dynamic viscosity?
A. M L -1 T -2
B. M L -2 T -1
C. L -1 T -1
D. M L -1 T -2
28.What is the dimension of kinematic viscosity?
A. M L 2T -1
B. L 2T -1
C. L 2T -2
D. M L 2T -1
29.What is the dimension of energy?
A. M L T -2
B. M L 1 T -2
C. M L 2 T -1
D. M L T -2
30.What is the dimension of force?
A. M L T -2
B. M T -2
C. L T -2
D. M L T -2
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