Mechanical Engineering MCQs

2075 MCQs  (Page 42 of 208)

Attempt Mechanical Engineering Mcqs Quiz
Depending on the radiating properties, body will be transparent when________________?
A. P = 0, x = 0 and a = 1
B. P=l,x = 0,anda = 0
C. P = 0, t= l,anda = 0
D. X = 0, a + p = 1
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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 critical temperature
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The amount of radiation mainly depends on___________________?
A. Nature of body
B. Temperature of body
C. Type of surface of body
D. All of the above
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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. Emissivity
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The emissive power of a body depends upon its___________________?
A. Temperature
B. Wave length
C. Physical nature
D. All of the above
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40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?
A. 0.45
B. 0.55
C. 0.40
D. 0.75
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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. Time
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Depending on the radiating properties, a body will be black when_________________?
A. P = 0, x = 0 and a = 1
B. P= l,t = 0anda = 0
C. P = 0, x = 1 and a = 0
D. X = 0, a + p = 0
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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. T
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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. More or less same as for liquids and gases
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Word of the Day
28 Sep
Expatriate
a person who lives outside their native country.
ملک بدری، جلا وطن کرن، شہر بدر کرنا

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