MCQOPTIONS
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MCQOPTIONS
This section includes 189 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The ratio of specific heat at constant pressure () and specific heat at constant volume () is |
| A. | equal to one |
| B. | less than one |
| C. | greater than one |
| D. | none of these |
| Answer» D. none of these | |
| 152. |
According to Gay-Lussac law for a perfect gas, / = constant, if is kept constant. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 153. |
If the value of = 0 in the equation = , then the process is called |
| A. | constant volume process |
| B. | adiabatic process |
| C. | constant pressure process |
| D. | isothermal process |
| Answer» D. isothermal process | |
| 154. |
The value of specific heat at constant pressure () is __________ that of at constant volume (). |
| A. | less than |
| B. | equal to |
| C. | more than |
| Answer» D. | |
| 155. |
The value of gas constant () in S. I. units is |
| A. | 0.287 J/kgK |
| B. | 2.87 J/kgK |
| C. | 28.7 J/kgK |
| D. | 287 J/kgK |
| Answer» E. | |
| 156. |
The sum of internal energy () and the product of pressure and volume (.) is known as |
| A. | workdone |
| B. | entropy |
| C. | enthalpy |
| D. | none of these |
| Answer» D. none of these | |
| 157. |
Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 158. |
The compression ratio is the ratio of |
| A. | swept volume to total volume |
| B. | total volume to swept volume |
| C. | swept volume to clearance volume |
| D. | total volume to clearance volume |
| Answer» E. | |
| 159. |
When the expansion or compression takes place according to the law = , the process is known as |
| A. | isothermal process |
| B. | adiabatic process |
| C. | hyperbolic process |
| D. | polytropic process |
| Answer» E. | |
| 160. |
The entropy is a point function and thus it is a property of the same. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 161. |
The state of a substance whose evaporation from its liquid state is complete, is known as |
| A. | vapour |
| B. | perfect gas |
| C. | air |
| D. | steam |
| Answer» C. air | |
| 162. |
An open cycle gas turbine works on |
| A. | Carnot cycle |
| B. | Otto cycle |
| C. | Joule's cycle |
| D. | Stirling cycle |
| Answer» D. Stirling cycle | |
| 163. |
The efficiency of Carnot cycle depends upon |
| A. | temperature limits |
| B. | pressure ratio |
| C. | volume compression ratio |
| D. | cut-off ratio and compression ratio |
| Answer» B. pressure ratio | |
| 164. |
The gas turbine cycle with regenerator improves |
| A. | thermal efficiency |
| B. | work ratio |
| C. | avoids pollution |
| D. | none of these |
| Answer» B. work ratio | |
| 165. |
When a gas is heated, change takes place in |
| A. | pressure |
| B. | volume |
| C. | temperature |
| D. | all of these |
| Answer» E. | |
| 166. |
When a fluid is allowed to expand suddenly into a vaccum chamber through an orifice of large dimensions, the process is known as free expansion process. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 167. |
According to kinetic theory of gases, the kinetic energy of translation of a molecule is proportional to |
| A. | 1/ |
| B. | 1/ |
| Answer» B. 1/ | |
| 168. |
The amount of heat given out by the complete combustion of 1 kg of fuel is known as calorific value of solid or liquid fuel. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 169. |
The conditions of temperature and pressure at 0°C (273K) and 760 mm of Hg pressure are termed as __________ temperature and pressure. |
| A. | normal |
| B. | standard |
| Answer» C. | |
| 170. |
The value of / for air is |
| A. | 1 |
| B. | 1.4 |
| C. | 1.8 |
| D. | 23 |
| Answer» C. 1.8 | |
| 171. |
Which of the following is an intensive property of a thermodynamic system? |
| A. | Volume |
| B. | Temperature |
| C. | Mass |
| D. | Energy |
| Answer» C. Mass | |
| 172. |
A triatomic molecule consists of __________ atoms. |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» D. four | |
| 173. |
A cycle consisting of __________ and two isothermal processes is known as Stirling cycle. |
| A. | two constant pressure |
| B. | two constant volume |
| C. | two isentropic |
| D. | one constant pressure, one constant volume |
| Answer» C. two isentropic | |
| 174. |
The ratio of molar specific heats for monoatomic gas is |
| A. | 1 |
| B. | 1.4 |
| C. | 1.67 |
| D. | 1.87 |
| Answer» D. 1.87 | |
| 175. |
The general law of expansion or compression is = , The process is said to be hyperbolic, if is equal to |
| A. | 0 |
| B. | 1 |
| C. | γ |
| D. | ∝ |
| Answer» C. γ | |
| 176. |
The state of a substance whose evaporation from its liquid state is partial, is known as steam. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 177. |
The value of universal gas constant is same for all gases. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 178. |
The numerical value of the thermal capacity and the water equivalent of the substance are the same. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 179. |
The area under the temperature-entropy curve (i. e. - curve) of any thermodynamic process represents the workdone during the process. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 180. |
The heating of a gas at constant pressure is governed by Charles' law. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 181. |
When a gas is heated at constant volume |
| A. | its temperature will increase |
| B. | its pressure will increase |
| C. | both temperature and pressure will increase |
| D. | neither temperature nor pressure will increase |
| Answer» D. neither temperature nor pressure will increase | |
| 182. |
The hard coke is obtained when carbonisation of coal is carried out at |
| A. | 300° to 500°C |
| B. | 500° to700°C |
| C. | 700° to 900°C |
| D. | 900° to 1100°C |
| Answer» E. | |
| 183. |
According to First law of thermodynamics, |
| A. | total internal energy of a system during a process remains constant |
| B. | total energy of a system remains constant |
| C. | workdone by a system is equal to the heat transferred by the system |
| D. | internal energy, enthalpy and entropy during a process remains constant |
| Answer» C. workdone by a system is equal to the heat transferred by the system | |
| 184. |
Stirling cycle consists of |
| A. | two constant volume and two isentropic processes |
| B. | two constant volume and two isothermal processes |
| C. | two constant pressure and two isothermal processes |
| D. | one constant volume, one constant pressure and two isentropic processes |
| Answer» C. two constant pressure and two isothermal processes | |
| 185. |
For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle. |
| A. | greater than |
| B. | less than |
| C. | equal to |
| Answer» C. equal to | |
| 186. |
In open cycle gas turbine plants |
| A. | the indirect heat exchanger and cooler is avoided |
| B. | direct combustion system is used |
| C. | a condenser is used |
| D. | all of the above |
| Answer» E. | |
| 187. |
The efficiency of Ericsson cycle is __________ Carnot cycle. |
| A. | greater than |
| B. | less than |
| C. | equal to |
| Answer» D. | |
| 188. |
One molecule of oxygen consists of __________ atoms of oxygen. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» B. 4 | |
| 189. |
In an isolated system, neither the heat and work nor the, mass of the working substance crosses the boundary of the system. |
| A. | True |
| B. | False |
| Answer» B. False | |