A low value of time constant can be achieved for a thermocouple by(i) Increasing the wire diameter(ii) Increasing the value heat transfer coefficient(iii) Use light metals of low density and low specific heat

A low value of time constant can be achieved for a thermocouple by(i)

1.	A low value of time constant can be achieved for a thermocouple by(i) Increasing the wire diameter(ii) Increasing the value heat transfer coefficient(iii) Use light metals of low density and low specific heat
A.	ii and iii
B.	i and iii
C.	i and ii
D.	i, ii and iii
Answer» B. i and iii

Discussion

No Comment Found

Related MCQs

A mercury thermometer with bulb idealized as a sphere of 1 mm radius is used for measuring the temperature of fluid whose temperature is varying at a fast rate. For mercury If the time for the temperature change of the fluid is 3 second, what should be the radius of thermocouple to read the temperature of the fluid?For the thermocouple materialk = 100 W/m Kα = 0.0012 m2/sh = 18 W/m2 K
An iron billet (k = 65 W/m K) measuring 20 * 15 * 80 cm is exposed to a convective flow resulting in convection coefficient of 11.5 W/m2 K. Determine the Biot number
“Thermal radiation suffers no attenuation in a vacuum”.
A low value of time constant can be achieved for a thermocouple by(i) Increasing the wire diameter(ii) Increasing the value heat transfer coefficient(iii) Use light metals of low density and low specific heat
A thermocouple junction of spherical form is to be used to measure the temperature of the gas stream. The junction is at 20 degree Celsius and is placed in a gas stream which is at 200 degree Celsius. Make calculations for junction diameter needed for the thermocouple to have thermal time constant of one second. Assume the thermos-physical properties as given belowk = 20 W/ m Kh = 350 W/m2 Kc = 0.4 k J/kg Kp = 8000 kg/m3
An iron billet (k = 65 W/m K) measuring 20 * 15 * 80 cm is exposed to a convective flow resulting in convection coefficient of 11.5 W/m<sup>2</sup> K. Determine the Biot numbe?
The lumped parameter solution for transient conduction can be conveniently stated as
How does the body temperature falls or rises with time?
‚Äö√Ñ√∂‚àö√ë‚àö‚à´Thermal radiation suffers no attenuation in a vacuum‚Äö√Ñ√∂‚àö√ë‚àöœÄ.$
Which of the following has units of time constant? (Where, P is density, A is area, c is specific heat and V is volume)

A low value of time constant can be achieved for a thermocouple by(i) Increasing the wire diameter(ii) Increasing the value heat transfer coefficient(iii) Use light metals of low density and low specific heat

Discussion

No Comment Found

Related MCQs

Reply to Comment