Chemical Engineering — Test 23
Page 1 of 3
Question 1
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?
Question 2
The critical pressure at which the latent heat of vaporization of steam becomes zero is _____________ Kg/cm2 ?
Question 3
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?
Question 4
What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively ?
Question 5
In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be________________?
Question 6
A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________________ W/m2 °C ?
Question 7
The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the _______________ allowance ?
Question 8
_______________ is the most important element, which controls the physical properties of steel ?
Question 9
________________ is the hardest material out of the following ?
Question 10
Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution ?