HEAT TRANSFER QUIZ

Heat flux, as defined in heat flow is analogous to __________ in electricity flow.

Voltage

Resistance

None of these

Current

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in temperature, the total emissivity of conductors

Remains same

Increases

Decreases linearly

Decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is correct ?

Resistance = Driving force x Rate

Driving force = Rate x Resistance

Rate = Driving force x Resistance

Rate = Resistance/Driving force

TRUE ANSWER : ?
YOUR ANSWER : ?

Heat transfer rate described by Fourier's law will decrease, if the __________ increases.

Temperature difference

Thickness

Heat transfer area

Thermal conductivity

TRUE ANSWER : ?
YOUR ANSWER : ?

In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

Remains constant

Increases

May increase or decrease, depends on the vacuum

Decreases

TRUE ANSWER : ?
YOUR ANSWER : ?

Heat transfer occurs by natural convection because change in temperature causes difference in

Heat capacity

Density

Viscosity

Thermal conductivity

TRUE ANSWER : ?
YOUR ANSWER : ?

Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)

1/CE

C/E

E/C

CE

TRUE ANSWER : ?
YOUR ANSWER : ?

Film boiling is usually not desired in commercial equipments, because

it is difficult to maintain

it is not economic

none of the listed here

the heat transfer rate is low in view of the large temperature drop. @

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ heat exchanger is used for chilling oil to be dewaxed.

Floating head

U-tube

Fixed tube

Double pipe

TRUE ANSWER : ?
YOUR ANSWER : ?

The sum of reflectivity and absorptivity for an opaque body is equal to

0.5

2

1

TRUE ANSWER : ?
YOUR ANSWER : ?

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