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For the following questions answer them individually
A long glass cylinder of inner diameter 0.03 m and outer diameter 0.05 m carries hot fluid inside. If the thermal conductivity of glass is 1.05 W/mK, the thermal resistance
per unit length of the cylinder is
In heat exchangers, degree of approach is defined as the difference between temperatures of
Log mean temperature difference in case of counter flow heat exchanger compared to parallel flow heat exchanger will be :
The outside diameter of hollow shaft is twice that of its inside diameter. The ratio of its torque carrying capacity to that of solid shaft of the same material and same outside diameter is :
The usual proportion for the width of the key used between shaft (of diameter d) and hub of pulley for transmitting power is
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