When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

A Conduction
B Convection
C Radiation
D Conduction and convection

Correct Answer: Radiation

Thermal radiation generates from the emission of electromagnetic waves. These waves carry the energy away from the emitting object. Radiation occurs through a vacuum or any transparent medium (either solid or fluid). Thermal radiation is the direct result of random movements of atoms and molecules in matter.
Bissoy MCQ
#Mechanical Engineering #Heat And Mass Transfer

Related Questions

Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without affecting the intervening medium.
A Cold body to hot body
B Hot body to cold body
C Smaller body to larger body
D Larger body to smaller body
Choose the sentence (s) in which the word 'straight means 'honest or frank'. (1) Draw a straight line through the two points. (2) You are not being straight with me, even though you know that I like straight answers. (3) It was a straight choice between taking or leaving the offer of friendship.
A (1)
B (3)
C (1) and (2)
D 1) and (3)
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by
A Conduction
B Convection
C Radiation
D Conduction and convection
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
Towns A and C are connected by a straight highway which is 60 miles long. The straight-line distance between town A and town B is 50 miles, and the straight-line distance from town B to town C is 50 miles. How many miles is it from town B to the point on the highway connecting towns A and C which is closest to town B?
A 30
B 40
C 50
D 60
Towns A and C are connected by straight highway which is 60 miles long. The straight-line distance between town A and town B is 50 miles, and the straight-line distance from town B to town C is 50 miles. How many miles is it from town B to the point on the highway connecting towns A and C which is closest to town B?
A 30
B 40
C 50
D 60
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type
A Parallel flow with equal heat capacities
B Counter flow with equal heat capacities
C Counter flow with unequal heat capacities
D Parallel flow with unequal heat capacities
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is
A Directly proportional to the surface area
B Directly proportional to the difference of temperatures between the two bodies
C Either (A) or (B)
D Both (A) and (B)
Startting from Town S, Mr. Ahsan drove straight East for 3 Kms, Then he turned lest and drove straight North for 4 kms and stopped at town T. What is the straight line distance from town to town T?
A 7 kms
B 5 kms
C 8 kms
D 23 kms
Starting from Town S, Mr Ahsan drove straight East for 3 kms, then he turned left and drove straight North for 4 kms and stopped at Town T. What is the straight -line distance form Town S to Town T?
A 7kms
B 5 kms
C 8 kms
D 23kms

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