Absorptivity of a body will be equal to its emissivity___________________?

Byadmin January 24, 2019August 16, 2021

Absorptivity of a body will be equal to its emissivity___________________?

A. at all temperatures
B. at one particular temperature
C. when system is under thermal equi-librium
D. at critical temperature
E. for a polished body

Heat Transfer

The thermal diffusivities for solids are generally__________________?

The thermal diffusivities for solids are generally__________________?

A. less than those for gases
B. jess than those for liquids
C. more than those for liquids and gases
D. more or less same as for liquids and gases
E. zerci

Read More The thermal diffusivities for solids are generally__________________?
Heat Transfer

Which of the following is the case of heat transfer by radiation ___________________?

Which of the following is the case of heat transfer by radiation ___________________?

A. blast furnace
B. heating of building
C. cooling of parts in furnace
D. heat received by a person from fireplace
E. all of the above

Read More Which of the following is the case of heat transfer by radiation ___________________?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.

Question: In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.
[A].

compressor
[B].
condenser
[C].
expansion valve
[D].
evaporator

Answer: Option A

Explanation:

No answer description available for this question.

Read More In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

Conduction is a process of heat transfer

Question: Conduction is a process of heat transfer
[A].

from one particle of the body to another without the actual motion of the particles
[B].
from one particle of the body to another by the actual motion of the heated particles.
[C].
from a hot body to a cold body, in a straight line, without affecting the intervening medium
[D].
none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Read More Conduction is a process of heat transfer
CHEMICAL ENGINEERING | Heat Transfer

The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

Question: The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )
[A].

(ΔT)2
[B].
ΔT
[C].
(ΔT)1/4
[D].
(ΔT)3/2

Answer: Option C

Explanation:

No answer description available for this question.

Read More The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)

Question: A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)
[A].

25 kJ/kg
[B].
50 kJ/kg
[C].
l00 kJ/kg
[D].
125 kJ/kg

Answer: Option B

Explanation:

No answer description available for this question.

Read More A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)

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