- (A) both the fluids at inlet (of heat ex¬changer where hot fluid enters) are in their coldest state
- (B) both the fluids at inlet are in their hot¬test state
- (C) both the fluids .at exit are in their hottest state
- (D) one fluid is in hottest state and other in coldest state at inlet
- (E) any combination is possible depending on design of heat exchanger
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- (A) one dimensional cases only
- (B) two dimensional cases only
- (C) three dimensional cases only
- (D) regular surfaces having non-uniform temperature gradients
- (E) irregular surfaces
- (A) higher
- (B) lower
- (C) same
- (D) depends on the area of heat exchanger
- (E) depends on temperature conditions
- (A) more than those for liquids
- (B) less than those for liquids
- (C) more than those for solids
- (D) dependent on the viscosity
- (E) same as for the liquids
- (A) directly proportional to thermal con¬ductivity
- (B) inversely proportional to density of substance
- (C) inversely proportional to specific heat
- (D) all of the above
- (E) none of the above
- (A) conduction
- (B) convection
- (C) radiation
- (D) conduction and radiation combined
- (E) convection and radiation combined
- (A) watt/cm2 °K
- (B) watt/cm4 °K
- (C) watt2/cm °K4
- (D) watt/cm2 °K4
- (E) watt/cm2 °K2
- (A) same
- (B) more
- (C) less
- (D) depends on other factors
- (E) none of the above
- (A) absolute temperature
- (B) square of temperature
- (C) fourth power of absolute temperature
- (D) fourth power of temperature
- (E) cube of absolute temperature
- (A) Grashoff no. and Reynold no
- (B) Grashoff no and Prandtl no.
- (C) Prandtl no. and Reynold no
- (D) Grashoff no., Prandtl no and Reynold no
- (E) none of the above
