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Home » Engineering » Chemical Engineering » Aptitude Test - 21
1. Pick up the wrong case. Heat flowing from one side to other depends directly on
A. Face Area
B. Time
C. Thickness
D. Face Area
2.Cork is a good insulator because it has
A. Free Electrons
B. Atoms Colliding Frequency
C. Low Density
D. Free Electrons
3.Thermal conductivity of water at 20°C is of the order of
A. 0.1
B. 0.23
C. 0.42
D. 0.1
4.A dimensionless heat transfer coefficient which gives a measure of the ratio of the heat transfer rate to the rate at which heat would be conducted within the fluid under a temperature gradient is kno
A. Reynolds number
B. Grashoff number
C. Nusselt number
D. Reynolds number
5.A dimensionless number which is the ratio of mass heat flow rate to the heat flow rate by conduction under a unit temperature gradient and through a thickness L is known as
A. Peclet number
B. Nusselt number
C. Grashof number
D. Peclet number
6.A non-dimensional number generally associated with natural convection heat transfer is
A. Peclet number
B. Nusselt number
C. Prandtl number
D. Peclet number
7.A dimensionless number representing the ratio of inertia forces to viscous forces is known as
A. Reynolds number
B. Prandtl number
C. Nusselt number
D. Reynolds number
8.A dimensionless group which represents the rate of the (product of intertial forces times buoyant forces) to viscous force squared is known as
A. Reynolds number
B. Prandtl number
C. Nusselt number
D. Reynolds number
9.Dynamic similarity is the similarity of
A. Shape
B. Forces
C. Velocities
D. Shape
10.A dimensionless number which is the ratio of kinematic viscosity to thermal diffusivity is known as
A. Prandtl number
B. Reynolds number
C. Nusselt number
D. Prandtl number
11.A non-dimensional number which generally finds application in mass transfer problems is
A. Stanton number
B. Stanton number
C. Graetz number
D. Stanton number
12.Longest wavelength
A. Gamma rays
B. X-rays
C. Ultraviolet rays
D. Gamma rays
13.The wagelength of X-rays is
A. 6 to 100000 micron
B. 0.4 to 0.8 micron
C. 0.1 to 0.4 micron
D. 6 to 100000 micron
14.a micron is equal to
A. 10-4 metres
B. 10-5 metres
C. 10-6 metres
D. 10-4 metres
15.If the absorptivity plus reflectivity of a body equals 1, then the body is known as
A. Black body
B. Grey body
C. Opaque body
D. Black body
16. Gases have poor
A. Reflectivity
B. Absorptivity
C. Transmissivity
D. Reflectivity
17.All substances emit radiation, the quality and quantity depending upon the absolute temperature and the properties of the material composing the radiating body. The above statement is known as the sta
A. Planck's law
B. Kirchhoff's law
C. Stefan-Bolzmann's law
D. Planck's law
18. The relation between the emissive and absorptive power of a surface is developed under
A. Planck's law
B. Kirchhoff's law
C. Electrical analogy
D. Planck's law
19. For all substances the absorptivity must lie between
A. 0 and 0.1
B. ?1 and +1
C. ?0.5 and + 0.5
D. 0 and 0.1
20. Which one of the following approximates to the black body condition?
A. Ice
B. Water
C. Lamp black
D. Ice
21.Which one of the following will radiate heat to a large extent?
A. White polished surface
B. White rough surface
C. Black rough surface
D. White polished surface
22. Two bodies one hot and the other cold are kept in vacuum. What will happen to the temperature of the hot body after sometime?
A. Remains the same
B. Decreases due to convection
C. Increases due to convection
D. Remains the same
23. A body cools from 90?C to 80?C in 5 minutes. Under the same external conditions to cool from 80?C to 70?C the body will take
A. 5 minutes
B. 4 minutes
C. 2.5 minutes
D. 5 minutes
24.The surface temperature of the sun is
A. 2000?K
B. 6000?K
C. 20000?K
D. 2000?K
25.Tea pots are highly polished
A. So that they may not conduct heat from outside
B. So that they may absorb all radiation from outside
C. To make them attractive to look at
D. So that they may not conduct heat from outside
26. A perfect black body is the one which
A. Absorbs all incident radiation
B. Reflects all incident radiation
C. Absorbs most of the incident radiation
D. Absorbs all incident radiation
27. What whould be shape of an ideal thermometer?
A. Spherical
B. Cylindrical
C. Cubical
D. Spherical
28.What is the unit for measuring the amplitude of a sound?
A. Decibel
B. Coulomb
C. Hum
D. Decibel
29.One nanometer is equal to
A. 10-6 m
B. 10-8 m
C. 10-9 m
D. 10-6 m
30.One fathom is equal to
A. 6 feet
B. 6 meters
C. 60 feet
D. 6 feet
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