State if following statements are true or false 1) Heat can not be transferred from a lower
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1) Heat can not be transferred from a lower temperature to a higher one. ( ) 2) When gas absorbs heat, its temperature must rise. ( 3) The cooling coefficient may be greater than 1. ( =) Enthalpy is a state parameter. ( ) ) Usually, the thermal conductivities of liquids are higher than those of gases. ( ) O Heat conduction only occurs in solids. ( ) The specific heat at constant pressure cp is always greater than cv. ) ) Increasing fluid velocity generally enhances surface convective heat transfer. ( ) Enhancing or weakening heat transfer should start from the side with lower thermal resistance in the heat exchanger. ( ) ) Baffles are generally added inside the shell to improve heat transfer on the shell side. ( ) 1) Heat can not be transferred from a lower temperature to a higher one. ( ) 2) When gas absorbs heat, its temperature must rise. ( 3) The cooling coefficient may be greater than 1. ( =) Enthalpy is a state parameter. ( ) ) Usually, the thermal conductivities of liquids are higher than those of gases. ( ) O Heat conduction only occurs in solids. ( ) The specific heat at constant pressure cp is always greater than cv. ) ) Increasing fluid velocity generally enhances surface convective heat transfer. ( ) Enhancing or weakening heat transfer should start from the side with lower thermal resistance in the heat exchanger. ( ) ) Baffles are generally added inside the shell to improve heat transfer on the shell side. ( )
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