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Mechanical Engineering Objective Questions { Heat Transfer }

1. Unit of thermal conductivity in S.I. units is
A.J/m2 sec
B.J/m °K sec
C.W/m °K
D.(B) and (C) above
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2. Thermal conductivity of solid metals with rise in temperature normally
C.Remains constant
D.May increase or decrease depending on temperature
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3. In heat transfer, conductance equals conductivity (kcal/hr/sqm/°C/cm) divided by
A.HR (time)
B.SQM (area)
C.°C (temperature)
D.CM (thickness)
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4. Heat transfer takes place as per
A.Zeroth law of thermodynamics
B.First law of thermodynamics
C.Second law of the thermodynamics
D.Kirchoff's law
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5. Depending on the radiating properties, a black body will be black when
A.ρ = 0, τ = 0 and α = 1
B.ρ = 1, τ = 0 and α = 0
C.ρ = 0, τ = 1 and α = 0
D.τ = 0, α+ρ = 1
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6. According to planck's law, the wavelength corresponding to the maximum energy is proportional to
A.Absolute temperature T
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7. When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred to as heat transfer by
D.Conduction and convection
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