1
GATE ME 2001
MCQ (Single Correct Answer)
+1
-0.3
Lumped heat transfer analysis of a solid object suddenly exposed to a fluid medium at a different temp is valid when.
A
Biot number $$< 0.1$$
B
Biot number $$> 0.1$$
C
Fourier number $$< 0.1$$
D
Fourier number $$> 0.1$$
2
GATE ME 1994
True or False
+1
-0
When the fluid velocity is doubled the thermal time constant of a thermometer used for measuring the fluid temperature reduces by a factor of $$2$$
A
TRUE
B
FALSE
3
GATE ME 1991
MCQ (Single Correct Answer)
+1
-0.3
Biot number signifies
A
The ratio of heat conducted to heat converted
B
The ratio of heat convected to heat conducted
C
The ratio of external convective resistance to internal conductive resistance
D
The ratio of internal conductive resistance to external convective resistance
4
GATE ME 1989
MCQ (Single Correct Answer)
+1
-0.3
The heat transfer process between a body and its ambient is governed by an internal conductive resistance $$\left( {{\rm I}CR} \right)$$ and an external convective resistance $$(ECR).$$ The body can be considered to be a lumped heat capacity system if
A
$${\rm I}CR > ECR$$
B
$${\rm I}CR$$ is marginally smaller than $$ECR$$
C
$${\rm I}CR = ECR$$
D
$${\rm I}CR$$ is negligible.
GATE ME Subjects
Turbo Machinery
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
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CBSE
Class 12