MCQOPTIONS
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MCQOPTIONS
This section includes 185 Mcqs, each offering curated multiple-choice questions to sharpen your Fluid Mechanics knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Enthalpy is calculated as the |
| A. | Sum of internal energy and the product of pressure and volume of the system |
| B. | Sum of internal energy and the product of pressure and density of the system |
| C. | Difference between the internal energy and the product of pressure and density of the system |
| D. | Difference between the internal energy and the product of pressure and volume of the system |
| Answer» B. Sum of internal energy and the product of pressure and density of the system | |
| 152. |
Figure shows the P-V diagram of an ideal gas. The work done by the gas in the process ABCDA is: |
| A. | 0.5PV |
| B. | 2PV |
| C. | 1.5PV |
| D. | 4PV |
| Answer» D. 4PV | |
| 153. |
In high-pressure compressor discharge pressure is |
| A. | 1 to 5 kg/cm2 |
| B. | 10 to 15 kg/cm2 |
| C. | 8 to 10 kg/cm2 |
| D. | 5 to 8 kg/cm2 |
| Answer» C. 8 to 10 kg/cm2 | |
| 154. |
In an isothermal process, the internal energy of an ideal gas |
| A. | Always increases |
| B. | Always decreases |
| C. | Increases or decreases |
| D. | Remains constant |
| Answer» E. | |
| 155. |
A 10 kg solid at 373 K with a specific heat of 0.8 kJ/kg-K is immersed in 40 kg of 293 K liquid with a specific heat of 4.0 kJ/kg-K. The temperature after a long time, if the container is insulated - |
| A. | 303 K |
| B. | 301 K |
| C. | 299 K |
| D. | 297 K |
| Answer» E. | |
| 156. |
A perfect gas is heated at constant pressure from 30°C till its volume become double. Then the final temperature is: |
| A. | 120°C |
| B. | 303°C |
| C. | 60°C |
| D. | 333°C |
| Answer» E. | |
| 157. |
For isochoric processes, which of the following property remains constant? |
| A. | Volume |
| B. | Temperature |
| C. | Pressure |
| D. | Entropy |
| Answer» B. Temperature | |
| 158. |
One mole of a monoatomic gas is taken through a cycle ABCDA as shown in the P-V diagram. Column II give the characteristics involved in the cycle. Match the process A → B with the processes given in Column II.Column – IProcess A → BProcess B → CProcess C → DProcess D → AColumn – IIp) Internal energy decreasesq) Internal energy increases.r) Heat is losts) Heat is gainedt) Work is done on the gasProcess A → B signifies |
| A. | p, q |
| B. | r, s |
| C. | p, r, t |
| D. | q, t |
| Answer» D. q, t | |
| 159. |
During throttling, which thermodynamic property does not change? |
| A. | Entropy |
| B. | Enthalpy |
| C. | Internal energy |
| D. | Pressure |
| Answer» C. Internal energy | |
| 160. |
A piston of 0.1 m diameter expands over a stroke of 0.2 m under constant gas pressure of 2 × 105 N/m2. The work done by the piston is: |
| A. | 31.4 J |
| B. | 42 J |
| C. | 314.2 J |
| D. | 21.5 W |
| Answer» D. 21.5 W | |
| 161. |
In an isentropic flow through a nozzle, air flows at the rate of 600 kg/hr. At inlet to nozzle, the pressure is 2 MPa and the temperature is 127°C. The exit pressure is of 0.5 MPa. If the initial velocity of air is 300 m/s, the exit velocity will be |
| A. | 867 m/s |
| B. | 776 m/s |
| C. | 685 m/s |
| D. | 594 m/s |
| Answer» E. | |
| 162. |
A re-entry module flies with Mach 10 at an ambient temperature of -27°C with CP = 840 J/kg-K, gas constant R = 140 J/kg-K. What is the stagnation temperature at the tip of the nose of the re-entry module? |
| A. | -23°C |
| B. | 1377°C |
| C. | 2477°C |
| D. | -253°C |
| Answer» D. -253°C | |
| 163. |
A system is said to be in thermodynamic equilibrium if the system is in: |
| A. | chemical equilibrium |
| B. | thermal, chemical and mechanical equilibrium |
| C. | thermal equilibrium |
| D. | mechanical equilibrium |
| Answer» C. thermal equilibrium | |
| 164. |
During a process on the closed system, its internal energy increases by twice the units than the heat added to it. It is possible due to |
| A. | radiation of heat from surroundings |
| B. | lowering of the temperature |
| C. | increasing of the temperature |
| D. | performing of shaft work on the system |
| Answer» E. | |
| 165. |
A steel ball of mass 1 kg and specific heat 0.4 kJ/kgK is at a temperature of 60°C. It is dropped into 1 kg water at 20°C. The final steady state temperature of water is |
| A. | 23.5°C |
| B. | 30°C |
| C. | 35°C |
| D. | 40°C |
| Answer» B. 30°C | |
| 166. |
If the specific heats of the working fluid are constant and the value of specific heat ratio γ is 1.4, the thermal efficiency (%) of the cycle is |
| A. | 21 |
| B. | 40.9 |
| C. | 42.6 |
| D. | 59.7 |
| Answer» B. 40.9 | |
| 167. |
A thermodynamic process during which the volume of the closed system in consideration remains constant is called _________. |
| A. | Isochoric process |
| B. | Isobaric process |
| C. | Adiabatic process |
| D. | Isothermal process |
| Answer» B. Isobaric process | |
| 168. |
Properties of substances like pressure, temperature and density, in thermodynamic co-ordinates are _____. |
| A. | Path functions |
| B. | Point functions |
| C. | Cyclic functions |
| D. | Real functions |
| Answer» C. Cyclic functions | |
| 169. |
Identify the complete and correct statement of the first law of thermodynamics |
| A. | During a process, extracting work without supplying heat, while sacrificing the energy of the system. |
| B. | Difference between the heat and work interactions during a process, which is property of the system. |
| C. | When a closed system executes a complete cycle, the sum of heat interactions is equal to the sum of work interactions. |
| D. | When a system undergoes a cycle, the integral of heat is equal to the integral of work. |
| Answer» D. When a system undergoes a cycle, the integral of heat is equal to the integral of work. | |
| 170. |
In a closed system, volume changes from 1 m3 to 2 m3 and heat addition is 2000 kJ. The change in internal energy given the pressure volume relation as p = 1000 V kPa, Where V is volume in m3 |
| A. | 500 kJ |
| B. | 1500 kJ |
| C. | 3500 kJ |
| D. | 4500 kJ |
| Answer» B. 1500 kJ | |
| 171. |
A system undergoes a change of state during which 100 kJ of heat is transferred to it and it does 50 kJ of work. The system is brought back to its original state through a process during which 120 kJ of heat is transferred to it. The work done by the system in kJ is |
| A. | 50 |
| B. | 70 |
| C. | 170 |
| D. | 200 |
| Answer» D. 200 | |
| 172. |
__________ is NOT a property of a system. |
| A. | Specific volume |
| B. | Heat |
| C. | Temperature |
| D. | Pressure |
| Answer» C. Temperature | |
| 173. |
If mass flow rate of steam through the turbine is 20kg/s, the power output of the turbine (in MW) is |
| A. | 12.157 |
| B. | 12.941 |
| C. | 168.001 |
| D. | 168.785 |
| Answer» B. 12.941 | |
| 174. |
Ice kept in a well-insulated thermo flask is an example of which system? |
| A. | Closed system |
| B. | Isolated system |
| C. | Open system |
| D. | Non-flow adiabatic system |
| Answer» C. Open system | |
| 175. |
1 kg liquid (specific heat = 3.0 kJ/kg-K) is stirred in closed chamber and its temperature is raised by 10°C. Heat loss to the surrounding is 3.0 kJ. The work done on the water during the process will be: |
| A. | 30 kJ |
| B. | 27 kJ |
| C. | 33 kJ |
| D. | 36 kJ |
| Answer» D. 36 kJ | |
| 176. |
WHICH_AMONG_THIS_IS_NOT_AN_EXOTHERMIC_REACTION??$ |
| A. | Combustion reaction |
| B. | Neutralization reaction |
| C. | Thermite reaction |
| D. | Evaporating liquid water |
| Answer» E. | |
| 177. |
What_reaction_takes_place_during_photosynthesis?$ |
| A. | Exothermic reaction |
| B. | Endothermic reaction |
| C. | Redox reaction |
| D. | Combustion reaction |
| Answer» C. Redox reaction | |
| 178. |
SI unit of enthalpy is______? |
| A. | Joule/kgK |
| B. | Joule/K |
| C. | Joule/kg |
| D. | K/kg |
| Answer» D. K/kg | |
| 179. |
What is the equation of entropy? |
| A. | Ratio of reversible transfer of heat to absolute temperature |
| B. | Ratio of absolute temperature to reversible heat transfer |
| C. | Ratio of adiabatic heat to macroscopic variables |
| D. | Ratio of macroscopic variables to adiabatic heat |
| Answer» B. Ratio of absolute temperature to reversible heat transfer | |
| 180. |
Entropy occurs due to _______ |
| A. | Change in macroscopic variables |
| B. | Volumetric changes only |
| C. | Mass changes only |
| D. | Temperature only |
| Answer» B. Volumetric changes only | |
| 181. |
An increase in enthalpy leads to an increase in __________ |
| A. | Increase in pressure |
| B. | Increase in volume |
| C. | Increase in internal energy |
| D. | Increase in mass |
| Answer» D. Increase in mass | |
| 182. |
The equation for the average kinetic energy is_________ |
| A. | 0.5 KT |
| B. | 1.5 KT |
| C. | 2.5 KT |
| D. | 3.5 KT |
| Answer» C. 2.5 KT | |
| 183. |
During a fluid flow, the temperature is developed due to________ |
| A. | Increase in density |
| B. | Change in pressure |
| C. | Translational Kinetic Energy |
| D. | Fluid level |
| Answer» D. Fluid level | |
| 184. |
Equation of the first law of thermodynamics is ________ |
| A. | Internal Energy= Heat added into work done |
| B. | Internal Energy= Heat rejected into work done |
| C. | Internal Energy= Heat added divided by work done |
| D. | Internal Energy=Heat added plus work done |
| Answer» E. | |
| 185. |
First law of thermodynamics deals with _______ |
| A. | Conservation of mass |
| B. | Conservation of momentum |
| C. | Conservation of energy |
| D. | Conservation of pressure |
| Answer» D. Conservation of pressure | |