MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Heat is loss from a 100 mm diameter steam pipe placed horizontally in ambient air at 30 degree Celsius. If the Nusselt number is 25 W/m2 K and thermal conductivity of the air is 0.03 W/m K, then heat transfer coefficient will be |
| A. | 7.5 W/m<sup>2</sup> K |
| B. | 16.5 W/m<sup>2</sup> K |
| C. | 25 W/m<sup>2</sup> K |
| D. | 30 W/m<sup>2</sup> K |
| Answer» B. 16.5 W/m<sup>2</sup> K | |
| 2. |
The dimensionless parameter l 3 p 2 g d t/ 2 is referred to as |
| A. | Stanton number |
| B. | Schmidt number |
| C. | Grashof number |
| D. | Peclet number |
| Answer» D. Peclet number | |
| 3. |
The Prandtl number will be lowest for |
| A. | Water |
| B. | Liquid metal |
| C. | Lube oil |
| D. | Aqueous solution |
| Answer» C. Lube oil | |
| 4. |
The non-dimensional parameter known as Stanton number is used in |
| A. | Forced convection heat transfer |
| B. | Condensation heat transfer |
| C. | Natural convection heat transfer |
| D. | Unsteady state heat transfer |
| Answer» B. Condensation heat transfer | |
| 5. |
Which dimensionless number has a significant role in forced convection? |
| A. | Prandtl number |
| B. | Peclet number |
| C. | Mach number |
| D. | Reynolds number |
| Answer» E. | |
| 6. |
Free convection heat flow does not depend on |
| A. | Density |
| B. | Coefficient of viscosity |
| C. | Gravitational force |
| D. | Velocity |
| Answer» C. Gravitational force | |
| 7. |
Let us say Mach number (greater than one), the flow is |
| A. | Sonic |
| B. | Subsonic |
| C. | Supersonic |
| D. | No flow |
| Answer» D. No flow | |
| 8. |
Ratio of actual velocity to sonic velocity is known as |
| A. | Mach number |
| B. | Peclet number |
| C. | Reynolds number |
| D. | Grashof number |
| Answer» B. Peclet number | |