MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Power Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Condenser is not used in |
| A. | Steam power plant |
| B. | Vapor compression refrigeration system |
| C. | Gas turbine power plant |
| D. | Vapor absorption refrigeration system |
| Answer» D. Vapor absorption refrigeration system | |
| 2. |
If the thermal efficiencies of mercury and steam cycles are respectively η1 and η2 , then the overall efficiency of a binary cycle can be expressed as: |
| A. | η1 - η2 |
| B. | η1 + η2 |
| C. | η1 + η2 + η1 η2 |
| D. | η1 + η2 - η1 η2 |
| Answer» E. | |
| 3. |
In which of the following pairs of cycles, both cycles have at least one isothermal process? |
| A. | Bell-Coleman cycle and Vapour compression refrigeration cycle |
| B. | Carnot cycle and Stirling cycle |
| C. | Diesel cycle and Otto cycle |
| D. | Brayton cycle and Rankine cycle |
| Answer» C. Diesel cycle and Otto cycle | |
| 4. |
Ideal air standard efficiency of a closed cycle gas turbine depends on |
| A. | Pressure ratio of the cycle only |
| B. | Temperature ratio of the cycle only |
| C. | Both the temperature ratio and pressure ratio |
| D. | None of the above |
| Answer» C. Both the temperature ratio and pressure ratio | |
| 5. |
In cooling tower, water is cooled by the process of: |
| A. | Condensation |
| B. | Fusion |
| C. | Evaporation |
| D. | Sublimation |
| Answer» D. Sublimation | |
| 6. |
A fluidized bed combustion system having an output of 35 MW at 80% efficiency when using a coal of heating value 26 MJ/kg with a sulphur content of 3.6% requires a particular limestone to be fed to it at a calcium-sulphur molar ratio of 3.0 so as to limit emissions of SO2 adequately. The limestone used contains 85% CaCO3. The required flow rate of limestone will be |
| A. | 2405 kg/h |
| B. | 2805 kg/h |
| C. | 3205 kg/h |
| D. | 3605 kg/h |
| Answer» B. 2805 kg/h | |
| 7. |
If η1 and η2 are the thermal efficiencies of two individual power plants. When they are coupled series, the overall thermal efficiency η0 of the combined plant is given by |
| A. | η0 = η1 η2 |
| B. | η0 = η1 + η2 |
| C. | η0 = η1 + η2 – η1 η2 |
| D. | \({\eta _0} = \frac{{{\eta _1} \;+\; {\eta _2}}}{{{\eta _1}{\eta _2}}}\) |
| Answer» D. \({\eta _0} = \frac{{{\eta _1} \;+\; {\eta _2}}}{{{\eta _1}{\eta _2}}}\) | |
| 8. |
Joule cycle is used in: |
| A. | Gas turbine |
| B. | Steam turbine |
| C. | Petrol engine |
| D. | Diesel engine |
| Answer» B. Steam turbine | |
| 9. |
For a gas turbine power plant, identify the correct pair of statementsP. Smaller in size compared to the steam power plant for same power outputQ. Starts quickly compared to the steam power plantR. Works on the principle of Rankine cycleS. Good compatibility with solid fuel. |
| A. | P, Q |
| B. | R, S |
| C. | Q, R |
| D. | P, S |
| Answer» B. R, S | |
| 10. |
In an engine working on air standard Stirling cycle, the temperature at the beginning of isothermal compression is 127°C. The engine thermal efficiency is 50%. The specific heat of air at constant volume is Cv. The heat transferred to the regenerator is |
| A. | 200 Cv kJ/kg |
| B. | 300 Cv kJ/kg |
| C. | 400 Cv kJ/kg |
| D. | 500 Cv kJ/kg |
| Answer» D. 500 Cv kJ/kg | |
| 11. |
An appliance is marked 500 W. At 220 V, it consumes 3 ampers of current. The power factor is approximately: |
| A. | 0.857 |
| B. | 0.812 |
| C. | 0.757 |
| D. | 0.660 |
| Answer» D. 0.660 | |