AcNiscosity
B:-Surface tension
C=Kinematic viscosity
D-Mass density
Correct Answer:- Option-é
‘Question80:-The fluid property associated with cavitation phenomenon is
‘AcSurface tension
B:-Vapour pressure
Ceviscosity
D-Bulk modulus of elasticity
Correct Answer:- Option ®
Question81:-There will be no rise oF fall of liquid inside a capillary tube, when the angle of contact between tube and liquid is
fon

8:0"

Correct Answer: Option-C

‘Question82:-Consider the following statements :
i. Absolute pressure is measured with reference to absolute vacuum pressure.
ji. Gauge pressure is measured with reference to atmospheric pressure,
Which of the statements given above is/are correct 7

Asionly
Beil only
ധി

Ds-neither i nor i
Correct Answer: Option-C

‘Question83:-The temperature difference across a 15 cm thick furnace wall is maintained at 30°C. Heat is conducted through the wall at the rate of 40 W/m*, What is the thermal
conductivity of the wall ?

8-20 WImK
B:-0.2 Wimk
6
0.02 Wimk
Correct Answer:- Option ®
Question84::Which of the following has maximum value of thermal conductivity at 20°C 2
Gold
B:-Silver
c-Copper
0-84

Correct Answer: Option-D

Question85:-The thermal diffusivity is given by
Where ‘x’, ‘p' and 'c’ denote the materials thermal conductivity, density and specific heat capacity respectively.

Be

9
ப

Correct Answer: Option:

Question86:-An electric cable, 6 mm in diameter is covered by plastic sheathing (k = 0.18 Wim.K). The surface temperature of cable was observed as 50°C when itis exposed to air at
20°C with convective coefficient of 12 W/m" K. What is the thickness of insulation, to keep the wire as cool as possible ?

കടന്ന

B12 mm