Heat Transfer MCQ’s – Thermometric Well
1 - Question
The convective coefficient in boilers and condenser is
d) Depends on time and temperature
Explanation: For low heat transfer rate it is high.
2 - Question
In thermometer, heat is dissipated from which end?
a) Back side
b) Front side
d) No heat is dissipated
Explanation: In thermometric well heat dissipation is from the end.
3 - Question
The thermometric well is treated as a fin of
a) It is not treated as a fin
b) Infinite length
c) Finite length
d) It depends on the amount of heat dissipation
Explanation: Generally for maximum heat dissipation it is treated as a fin of finite length.
4 - Question
Thermometric well apparatus doesn’t consist of
b) Pipe line
Explanation: It doesn’t consist of an ammeter.
5 - Question
For what purpose we use thermometric well?
a) To measure current
b) To measure resistance
c) To measure temperature of gas
d) To stop heat dissipation
Explanation: We use this apparatus for the measurement of a temperature of gas flowing through pipeline.
6 - Question
In thermometric well, the error can be minimized by (i) The value of parameter ml slows down by some quantity. (ii) Lagging of the tube so that conduction of heat along its length is arrested.
Explanation: Here, we increase the value of parameter ml.
7 - Question
Suppose there are two reservoirs A and B. Let TA and TB be the temperatures of respective reservoirs. At any instant say TA = TB. In this case, maximum temperature occurs at
d) All over the rod
Explanation: Here temperatures are same so x = ½ i.e. middle of the rod.
8 - Question
The relevant boundary conditions in case of heat transfer from a bar connected to two heat sources at different temperatures are
a) α = α 1 at x = 0 and α = α 2 at x = infinity
b) α = α 1 at x = 1 and α = α 2 at x = 2L
c) α = α 1 at x = infinity and α = α 2 at x = 1
d) α = α 1 at x = 0 and α = α 2 at x = L
Explanation: It should be at x = o and x = L.
9 - Question
“The tube that is used in a thermometric well is considered as a hollow fin and the temperature distribution is obtained by using the relation applicable to infinitely long fin”.
Explanation: The relation applicable to fin with insulated tip is used here.
10 - Question
“The diameter of well does not have any effect on temperature measurement by the thermometer”.
Explanation: Here, there is no relation between well diameter and temperature.