Heat Transfer Questions

Q.  The time constant of a thermocouple is_______________?

a. the time taken to attain the final temperature to be measured
b. the time taken to attain 50% of the value of initial temperature difference
c. the time taken to attain 63.2% of the value of initial temperature difference
d. determined by the time taken to reach 100°C from 0°C
e. none of the above


ANSWER: See Answer
 
No explanation is available for this question!
MCQs:  A grey body is one whose absorptivity_________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Heat conducted througfi unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called__________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of____________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Emissivity of a white polished body in comparison to a black body is________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  A non-dimensional number generally associated with natural convection heat transfer is________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  In heat exchangers, degree of approach is defined as the difference between temperatures of________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  A steam pipe is to be insulated by two insulating materials put over each other . For best results__________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  According of Kirchhoff’s law______________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is _________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Fourier’s law of heat conduction is valid for_________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  In counter flow heat exchangers_________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The concept of overall coefficient of heat transfer is used in case of heat transfer by________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Joule sec is the unit of_________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  All radiations in a black body are___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The unit of overall coefficient of heat transfer is___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The value of the wavelength for maximum emissive power is given by ___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  Total emissivity of polished silver compared to black body is___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The value of Prandtl number for air is about _______________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts
MCQs:  The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?
Category: Mechanical Engineering Questions,   Published by: T-Code Scripts