What is the wavelength band for TV rays?

1 * 10 3 to 3 * 10 10 micron meter

1 * 10 3 to 34 * 10 10 micron meter

1 * 10 3 to 2 * 10 10 micron meter

1 * 10 3 to 3 * 10 10 micron meter

1 * 10 3 to 56 * 10 10 micron meter

The curve for unsteady state cooling or heating of bodies is

Hyperbolic curve asymptotic both to time and temperature axis

Exponential curve asymptotic both to time and temperature axis

Parabolic curve asymptotic to time axis

Exponential curve asymptotic to time axis

The rate of inflow and outflow of mass are different

The state of matter inside the control volume varies with time

There can be work and heat interactions across the control volume

There is no accumulation of energy inside the control volume

The rate of inflow and outflow of mass are different

Conduction when temperature at a point varies with time

Heat transfer with a very little temperature difference

1.	What is the wavelength band for TV rays?
A.	1 * 10 <sup>3 </sup>to 34 * 10 <sup>10 </sup>micron meter
B.	1 * 10 <sup>3 </sup>to 2 * 10 <sup>10 </sup>micron meter
C.	1 * 10 <sup>3 </sup>to 3 * 10 <sup>10 </sup>micron meter
D.	1 * 10 <sup>3 </sup>to 56 * 10 <sup>10 </sup>micron meter
Answer» C. 1 * 10 <sup>3 </sup>to 3 * 10 <sup>10 </sup>micron meter

2.	The curve for unsteady state cooling or heating of bodies is
A.	Hyperbolic curve asymptotic both to time and temperature axis
B.	Exponential curve asymptotic both to time and temperature axis
C.	Parabolic curve asymptotic to time axis
D.	Exponential curve asymptotic to time axis
Answer» E.

3.	A cylindrical stainless steel (k = 25 W/m K) ingot, 10 cm in diameter and 25 cm long, passes through a heat treatment furnace which is 5 meter in length. The initial ingot temperature is 90 degree Celsius, the furnace gas is at 1260 degree Celsius and the combined radiant and convective surface coefficient is 100 W/m²K. Determine the maximum speed with which the ingot moves through the furnace if it must attain 830 degree Celsius temperature. Take thermal diffusivity as 0.45 * 10 ^-5m²/s
A.	. 000116 m/s
B.	.000216 m/s
C.	. 000316 m/s
D.	. 000416 m/s
Answer» C. . 000316 m/s

4.	Which of the following is not correct in a transient flow process?
A.	The state of matter inside the control volume varies with time
B.	There can be work and heat interactions across the control volume
C.	There is no accumulation of energy inside the control volume
D.	The rate of inflow and outflow of mass are different
Answer» D. The rate of inflow and outflow of mass are different

5.	Transient condition means
A.	Conduction when temperature at a point varies with time
B.	Very little heat transfer
C.	Heat transfer with a very little temperature difference
D.	Heat transfer for a short time
Answer» B. Very little heat transfer

6.	An average convective heat transfer coefficient for flow of air over a sphere has been measured by observing the temperature-time history of a 12 mm diameter copper sphere (density = 9000 kg/m³ and c = 0.4 k J/kg K) exposed to air at 30 degree Celsius. The temperature of the sphere was measured by two thermocouples one located at the center and the other near the surface. The initial temperature of the ball was 75 degree Celsius and it decreased by 10 degree Celsius in 1.2 minutes. Find the heat transfer coefficient
A.	27.46 W/m<sup>2</sup> K
B.	21.76 W/m<sup>2</sup> K
C.	29.37 W/m<sup>2</sup> K
D.	25.13 W/m<sup>2</sup> K
Answer» E.

7.	The transient response of a solid can be determined by the equation. (Where, P is density, V is volume, c is specific heat and A is area)
A.	4 p V c = h A (t t<sub>0</sub>)
B.	3 p V c = h A (t t<sub>0</sub>)
C.	2 p V c = h A (t t<sub>0</sub>)
D.	p V c = h A (t t<sub>0</sub>)
Answer» E.