Heat Transfer Questions

Q.  A grey body is one whose absorptivity_________________?

a. varies with temperature
b. varies with wavelength of the incident ray
c. is equal to its emissivity
d. does not vary with temperature and. wavelength of the incident ray
e. none of the above


ANSWER: See Answer
 
No explanation is available for this question!
TasDia Network - Mcqs | Signature | Lyrics
MCQs:  In free con-vection heat transfer, Nusselt number is function of________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Log mean temperature difference in case of counter flow compared to parallel flow will be________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The unit of Stefan Boltzmann constant is ____________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Stefan Boltzmann law is applicable for heat transfer by __________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Thermal diffusivity of a substance is __________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The thermal diffusivities for gases are generally_____________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  A grey body is one whose absorptivity _________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Planck’s law holds good for________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  A perfect black body is one which_______________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  In regenerator type heat exchanger, heat transfer takes place by___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Depending on the radiating properties, body will be transparent when________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Absorptivity of a body will be equal to its emissivity___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The amount of radiation mainly depends on___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The ratio of the energy absorbed by the body to total energy falling on it is called_________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The emissive power of a body depends upon its___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit_______________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts