Question 1. Consider the following statements pertaining to heat transfer through fins

(i) They must be arranged at right angles to the direction of flow of working fluid

(ii) The temperature along the fin is variable and accordingly heat transfer rate varies along the fin elements

(iii) Fins are equally effective irrespective whether they are on the hot side or cold side of the fluid

(iv) Fins are made of materials that have thermal conductivity higher than that of wall

Identify the correct statements

Question 2. The handle of a saucepan, 30 cm long and 2 cm in diameter, is subjected to 100 degree Celsius temperature during a certain cooking operation. The average unit surface conductance over the handle surface is 7.35 W/m² degree in the kitchen air at 24 degree Celsius. The cook is likely to grasp the last 10 cm of the handle and hence the temperature in this region should not exceed 38 degree Celsius. What should be the thermal conductivity of the handle material to accomplish it? The handle may be treated as a fin insulated at the tip

Question 3. An increase in fin effectiveness is caused by high value of

(i) Convective coefficient

(ii) Thermal conductivity

(iii) Circumference

(iv) Area

Identify the correct statement

Question 4. Choose the correct option regarding fin efficiency and fin effectiveness

Question 5. Let us assume a square section fin split longitudinally and used as two fins. This will result in

Question 6. Mark the false statement regarding effectiveness of fin

Question 7. The thermometric well is treated as a fin of

Question 8. The convective coefficient in boilers and condenser is

Question 9. Thermometric well apparatus doesn’t consists of

Question 10. In thermometer heat is dissipated from which end?