Heat Transfer Mock Test 7

10%

Question 1 of 10

1. What is the dimension of acceleration?

M L T ^-1

M L T ^-2

L T ^-2

L T ^-4

Question 1 of 10

Question 2 of 10

2. Newton-Rikhman law is given by

Q = h A (t _s – t_f)

Q = 3 h A (t _s – t_f)

Q = 4 h A (t _s – t_f)

Q = 2 h A (t _s – t_f)

Question 2 of 10

Question 3 of 10

3. Bernoulli’s equation for fluid flow along a stream line is given as

p/w + V ²/2 g + y = constant

p/w + V ²/2 g + y = 1

p/w + V/2 g + y = constant

p/w + V ²/2 g + y = 2

Question 3 of 10

Question 4 of 10

4. Ratio of actual velocity to sonic velocity is known as

Reynolds number

Peclet number

Mach number

Grashof number

Question 4 of 10

Question 5 of 10

5. Air at 20 degree Celsius flows over a flat plate maintained at 75 degree Celsius. Measurements shows that temperature at a distance of 0.5 mm from the surface of plate is 50 degree Celsius. Presuming thermal conductivity of air is 0.0266 W/m K, estimate the value of local heat transfer coefficient

25.18 W/m² K

26.18 W/m² K

23.18 W/m² K

24.18 W/m² K

Question 5 of 10

Question 6 of 10

6. Thermal similarity refers to the comparison of two systems made on the basis of their

Length

Specific heat

Temperature

Heat flux

Question 6 of 10

Question 7 of 10

7. The temperature profile at a particular location on a surface is prescribed by the identity
(t _s – t) / (t _s – t_infinity) = sin (π y/0.015)
If thermal conductivity of air is stated to be 0.03 W/m K, determine the value of convective heat transfer coefficient

6.38 W/m² K

6.28 W/m² K

6.18 W/m² K

6.48 W/m² K

Question 7 of 10

Question 8 of 10

8. Thermo-physical properties of the fluid are represented by
(i) Density
(ii) Viscosity
(iii) Specific heat
(iv) Thermal conductivity
Identify the correct option

i, ii and iii

i, ii, iii and iv

ii, iii and iv

i and ii

Question 8 of 10

Question 9 of 10

9. S.I unit of specific heat is

K kg/J

k J/kg K

kg/K

J/K

Question 9 of 10

Question 10 of 10

10. Geometrically similarity prescribes that the ratio of the corresponding linear dimensions of the two systems are

Same

Never same

May be twice

Unity

Question 10 of 10