Heat Transfer Practice Test 7

1. The equation of friction loss in a pipe of length l and diameter d through which fluid flows with velocity v is

h _i= 4 f V ²/d 2 g

h _i= 4 f V ²/2 g

h _i= 4 f V ²/d g

h _i= 4 f V ²/d 2 g

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

Same

May be twice

Unity

Never same

3. Let us say Mach number (greater than one), the flow is

Subsonic

Supersonic

No flow

Sonic

4. What is the dimension of specific heat?

L T ^-1 α ^-1

M L T ^-1 α ^-1

M L T ^-2 α ^-1

L T ^-2 α ^-1

5. 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

i and ii

ii, iii and iv

6. What is the dimension of resistance?

M L T

M L T ^-2

M L T ²

M L T ^-1

7. What is the dimension of length?

M L

8. The results obtained from experiments on models can be applied to prototype only if a complete similarity exists between the model and prototype and for that the two systems may be
(i) Geometrically similar
(ii) Kinematically similar
(iii) Dynamically similar
Identify the correct statements

i and iii

ii and iii

i, ii and iii

i and ii

9. Which is a full size structure employed in the actual engineering design?

Neutron

Prototype

Electron

Proton

10. The similarity of motion is known as

Geometrical similarity

Dynamic similarity

Thermal similarity

Kinematic similarity