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Engineering :: Heat Transfer

141.  Thermal conductivity of wood least depends on
A. Moisture B. Density
C. Temperature D. Grain orientation
E. All of the above    
142.  In air prelieater for boiler heat is least transferred by
A. Conduction B. Convection
C. Conduction and convection D. Radiation
E. Conduction, convection and radiation.    
143.  Which method can be used for heating wood?
A. Flame heating B. Resistance heating
C. Dielectric heating D. Radiation heating
E. Any of the above    
144.  The total solar radiation incident on a body is 1000 kcal/min. The body reflects 400 kcal/min. If the transmissivity of the surface will be
A. 0.15 B. 0.3
C. 0.4 D. 0.45
E. 0.85    
145.  The phenomenon of boiling the milk in an open container when milk spills over the vessel is termed as
A. Film boiling B. Pool boiling
C. Nuclear boiling D. Sub-cooled boiling
E. Interface evaporation    
146.  The value of the wavelength for maximum emissive power is given by
A. Planck's law B. D'Alembert's rule
C. Kirchhoff's law D. Stefan law
E. Wein's law    
147.  Which type of heat exchanger an automobile radiator is?
A. Parallel flow type B. Counter flow type
C. Recuperator type D. Regenerator type
E. Cross flow type    
148.  A hollow sphere with uniform interior temperature and a small hole behaves very nearly as a
A. Grey body B. White body
C. Opaque body D. Transparent body
E. Black body    
149.  A body which transmits all the radiations falling on it is known as
A. Black body B. Grey body
C. Transparent body D. White body
E. None of the above    
150.  A black body absorbs all radiations. As a result of absorption of these radiations
A. A black body shines B. The temperature of black body rises
C. Black body radiates energy to other bodies D. Black body becomes good conductor of heat

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