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Home » Engineering » Chemical Engineering » Aptitude Test - 15
1. For the hydrogen atom, which series describes electron transitions to the N=1 orbit, the lowest energy electron orbit? Is it the:
A. Lyman series
B. Balmer series
C. Paschen series
D. Lyman series
2. Total emissivity of polished silver compared to black body is
A. Same
B. Higher
C. More Or Less Same
D. Same
3.Stefan Boltzmann law is applicable for heat transfer by
A. conduction
B. convection
C. radiation
D. conduction
4.The thermal diffusivities for solids are generally
A. less than those for gases
B. jess than those for liquids
C. more than those for liquids and gases
D. less than those for gases
5.According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to
A. absolute temperature
B. T2
C. T5
D. absolute temperature
6.The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit
A. Temperature
B. Thickness
C. Area
D. Temperature
7. The ratio of the energy absorbed by the body to total energy falling on it is called
A. Absorptive Power
B. Emissive Power
C. Absorptivity
D. Absorptive Power
8. The amount of radiation mainly depends on
A. nature of body
B. temperature of body
C. type of surface of body
D. nature of body
9.The emissive power of a body depends upon its
A. Temperature
B. Wave Length
C. Physical Nature
D. Temperature
10. In regenerator type heat exchanger, heat transfer takes place by
A. direct mixing of hot and cold fluids
B. a complete separation between hot and cold fluids
C. flow of hot and cold fluids alternately over a surface
D. direct mixing of hot and cold fluids
11.If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of
A. 3
B. 6
C. 9
D. 3
12.Absorptivity of a body will be equal to its emissivity
A. at all temperatures
B. at one particular temperature
C. when system is under thermal equi-librium
D. at all temperatures
13. Planck’s law holds good for
A. Black Bodies
B. Polished Bodies
C. All Coloured Bodies
D. Black Bodies
14. A grey body is one whose absorptivity
A. varies with temperature
B. varies with the wave length of incident ray
C. varies with both
D. varies with temperature
15. The time constant of a thermocouple is
A. the time taken to attain the final temperature to be measured
B. the time taken to attain 50% of the value of initial temperature difference
C. the time taken to attain 63.2% of the value of initial temperature difference
D. the time taken to attain the final temperature to be measured
16.The concept of overall coefficient of heat transfer is used in heat transfer problems of
A. conduction
B. convection
C. radiation
D. conduction
17.Thermal Conductivity Of Glass-Wool Varies From Sample To Sample Because Of Variation In
A. Composition
B. Density
C. Porosity
D. Composition
18. Moisture would find its way into insulation by vapour pressure unless it is prevented by
A. high thickness of insulation
B. high vapour pressure
C. less thermal conductivity insulator
D. high thickness of insulation
19. Thermal diffusivity is
A. a dimensionless parameter
B. function of temperature
C. used as mathematical model
D. a dimensionless parameter
20.Thermal diffusivity of a substance is .
A. proportional of thermal conductivity
B. inversely proportional to k
C. proportional to (k)
D. proportional of thermal conductivity
21. Thermal Conductivity Of Wood Depends On
A. Moisture
B. Density
C. Temperature
D. Moisture
22.Quilts and jackets keep us warm by
A. trapping air
B. preventing release of heat from our body
C. heating itself up
D. trapping air
23.By placing our hand above a hot object, we can feel heat because
A. it is releasing heat
B. our hand is releasing heat
C. our hand is cooling down
D. it is releasing heat
24.The objects that are cooler than other objects gain heat from
A. sun
B. surroundings
C. stove
D. sun
25.The color and texture of poor absorber of radiant heat is
A. black and shiny
B. black and dull
C. white and shiny
D. black and shiny
26.The cool air which comes from sea to land is known as
A. sea breeze
B. land breeze
C. forward breeze
D. sea breeze
27. Compared to hot air, cool air is
A. light
B. good conductor
C. more strong
D. light
28. Ideal temperature for warm bath water is usually between
A. 30 °C
B. 40 °C
C. 50 °C
D. 30 °C
29.Just like light, radiant heat can also be
A. reflected
B. turned off
C. used in LED
D. reflected
30.In hot places, well insulated house stays
A. warm
B. hot
C. cool
D. warm
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