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Home » Engineering » Chemical Engineering » Aptitude Test - 17
1. In a shaft the shear stress is not directly proportional to
A. Radius of the shaft
B. Angle of twist
C. Length of the shaft
D. Radius of the shaft
2.The greatest load which a spring can carry without getting permanently distorted, is called
A. Stiffness
B. Proof resilience
C. Proof stress
D. Stiffness
3.In plastic analyses the shape factor for rectangular section is
A. 1.4
B. 1.5
C. 1.6
D. 1.4
4.Coefficient of wind resistance of a circular surface is
A. 1 / 2
B. 1 / 3
C. 2 / 3
D. 1 / 2
5. Determination of B.M. of structures by slope deflection method falls in the category of
A. Determinate analysis
B. Matrix analysis
C. Indeterminate analysis
D. Determinate analysis
6. The cases of support sinking are encountered when
A. Soil conditions change at nearby distances
B. Load geography is undulated
C. Both of the above
D. Soil conditions change at nearby distances
7. The ratio between angle of repose and angle of friction is
A. 0.3
B. 1.30
C. 0.9
D. 0.3
8.Heat conducted througfi unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called
A. thermal resistance
B. temperature gradient
C. thermal conductivity
D. thermal resistance
9. The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as
A. emissivity
B. reflectivity
C. intensity of radiation
D. emissivity
10.Emissivity of a white polished body in comparison to a black body is
A. higher
B. lower
C. same
D. higher
11. A grey body is one whose absorptivity
A. varies with temperature
B. varies with wavelength of the incident ray
C. is equal to its emissivity
D. varies with temperature
12.Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to sm
A. 01:05:00
B. 02:01:00
C. 01:02:00
D. 01:05:00
13.A non-dimensional number generally associated with natural convection heat transfer is
A. Grashoff number
B. Weber number
C. Prandtl number
D. Grashoff number
14.LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is
A. higher
B. lower
C. same
D. higher
15. In heat exchangers, degree of approach is defined as the difference between temperatures of
A. cold water inlet and outlet
B. hot medium inlet and outlet
C. hot medium outlet and cold water inlet
D. cold water inlet and outlet
16.In counter flow heat exchangers
A. both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
B. both the fluids at inlet are in their hottest state
C. both the fluids .at exit are in their hottest state
D. both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
17. A steam pipe is to be insulated by two insulating materials put over each other. For best results
A. better insulation should be put over pipe and better one over it
B. inferior insulation should be put over pipe and better one over it
C. both may be put in any order
D. better insulation should be put over pipe and better one over it
18.Fourier’s law of heat conduction is valid for
A. one dimensional cases only
B. two dimensional cases only
C. three dimensional cases only
D. one dimensional cases only
19.According of Kirchhoff’s law,
A. radiant heat is proportional to fourth power of absolute temperature
B. emissive power and absorptivity are constant for all bodies
C. ratio of emissive power to absorptive power is maximum for perfectly black body
D. radiant heat is proportional to fourth power of absolute temperature
20.All radiations in a black body are
A. reflected
B. refracted
C. transmitted
D. reflected
21.According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a
A. grey body
B. brilliant white polished body
C. red hot body
D. grey body
22.The concept of overall coefficient of heat transfer is used in case of heat transfer by
A. conduction
B. convection
C. radiation
D. conduction
23.Joule sec is the unit of
A. universal gas constant
B. kinematic viscosity
C. thermal conductivity
D. universal gas constant
24.The value of Prandtl number for air is about
A. 0.15
B. 0.35
C. 0.7
D. 0.15
25.The value of the wavelength for maximum emissive power is given by —
A. Wien’s law
B. Planck’s law
C. Stefan’s law
D. Wien’s law
26.Log mean temperature difference in case of counter flow compared to parallel flow will be
A. same
B. more
C. less
D. same
27.The energy distribution of an ideal reflector at higher temperatures is largely in the range of
A. shorter wavelength
B. longer wavelength
C. remains same at all wavelengths
D. shorter wavelength
28. Which of the following is used for measurement of high temperatures?
A. vapour thermometer
B. energy meter
C. resistance thermometer
D. vapour thermometer
29. If boiling water is taken to the dark side of the moon it will
A. immediately vaporize
B. immediately freeze
C. continue to boil
D. immediately vaporize
30.Which two liquids are used in the construction of minimum and maximum thermometers?
A. mercury and water
B. water and alcohol
C. mercury and alcohol
D. mercury and water
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