MCQOPTIONS
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MCQOPTIONS
This section includes 1092 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 651. |
Measurement of temperature is based on |
| A. | Thermodynamic properties |
| B. | Zeroth law of thermodynamics |
| C. | First law of thermodynamics |
| D. | Second law of thermodynamics |
| Answer» C. First law of thermodynamics | |
| 652. |
The atomic mass of sulphur is |
| A. | 12 |
| B. | 14 |
| C. | 16 |
| D. | 32 |
| Answer» E. | |
| 653. |
In open cycle gas turbine plants |
| A. | Direct combustion systems is used |
| B. | A condenser is used |
| C. | The indirect heat exchanger and cooler is avoided |
| D. | All of the above |
| Answer» E. | |
| 654. |
Producer gas is obtained by |
| A. | Carbonization of bituminous coal |
| B. | Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast |
| C. | Passing steam over incandescent coke |
| D. | Passing air and a large amount of steam over waste coal at about 650°C |
| Answer» C. Passing steam over incandescent coke | |
| 655. |
According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as |
| A. | Temperature |
| B. | Absolute temperature, if volume is kept constant |
| C. | Volume, if temperature is kept constant |
| D. | None of these |
| Answer» C. Volume, if temperature is kept constant | |
| 656. |
The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is |
| A. | 0.086 |
| B. | 1.086 |
| C. | 1.086 |
| D. | 4.086 |
| Answer» C. 1.086 | |
| 657. |
Work-done in a free expansion process is |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | Positive |
| Answer» B. Minimum | |
| 658. |
The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules. |
| A. | 1 g |
| B. | 10 g |
| C. | 100 g |
| D. | 1000 g |
| Answer» E. | |
| 659. |
A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is |
| A. | 54°C |
| B. | 327°C |
| C. | 108°C |
| D. | 654°C |
| Answer» C. 108°C | |
| 660. |
In closed cycle gas turbine, the air is compressed |
| A. | Isothermally |
| B. | Isentropically |
| C. | Polytropically |
| D. | None of these |
| Answer» C. Polytropically | |
| 661. |
The following cycle is used for air craft refrigeration |
| A. | Brayton cycle |
| B. | Joule cycle |
| C. | Carnot cycle |
| D. | Reversed Brayton cycle |
| Answer» E. | |
| 662. |
The variables which control the physical properties of a perfect gas are |
| A. | Pressure exerted by the gas |
| B. | Volume occupied by the gas |
| C. | Temperature of the gas |
| D. | All of these |
| Answer» E. | |
| 663. |
Characteristic gas constant of a gas is equal to |
| A. | Cp /Cv |
| B. | Cv /Cp |
| C. | Cp - Cv |
| D. | Cp + Cv |
| Answer» D. Cp + Cv | |
| 664. |
A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is |
| A. | Theoretically possible |
| B. | Not possible |
| C. | May be possible with lot of sophistications |
| D. | Cost will be very high |
| Answer» C. May be possible with lot of sophistications | |
| 665. |
The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio) |
| A. | rγ - 1 |
| B. | 1 - rγ - 1 |
| C. | 1 - (1/r) γ/γ - 1 |
| D. | 1 - (1/r) γ - 1/ γ |
| Answer» E. | |
| 666. |
Kelvin-Planck’s law deals with |
| A. | Conservation of work |
| B. | Conservation of heat |
| C. | Conversion of work into heat |
| D. | Conversion of heat into work |
| Answer» E. | |
| 667. |
A tri-atomic molecule consists of __________ atoms. |
| A. | Three |
| B. | One |
| C. | Two |
| D. | Four |
| Answer» B. One | |
| 668. |
The atomic mass of nitrogen is __________ oxygen. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 669. |
The throttling process is __________ process. |
| A. | Reversible |
| B. | Irreversible |
| C. | Reversible or irreversible |
| D. | None of these |
| Answer» C. Reversible or irreversible | |
| 670. |
For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 671. |
The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | None of these |
| Answer» B. Less than | |
| 672. |
The efficiency of Ericsson cycle is __________ Carnot cycle. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | None of these |
| Answer» D. None of these | |
| 673. |
The efficiency of Stirling cycle is __________ Carnot cycle. |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | None of these |
| Answer» D. None of these | |
| 674. |
Molecular volume of any perfect gas at 600 × 103 N/m² and 27°C will be |
| A. | 4.17 m3/kg mol |
| B. | 400 m3/kg mol |
| C. | 0.15 m3/kg mol |
| D. | 41.7 m3/kg mol |
| Answer» B. 400 m3/kg mol | |
| 675. |
The absolute zero pressure can be attained at a temperature of |
| A. | 0°C |
| B. | -273°C |
| C. | 273 K |
| D. | None of these |
| Answer» E. | |
| 676. |
An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is |
| A. | Feasible |
| B. | Impossible |
| C. | Possible |
| D. | Possible, but with lot of sophistications |
| Answer» E. | |
| 677. |
The gas constant (R) is equal to the |
| A. | Sum of two specific heats |
| B. | Difference of two specific heats |
| C. | Product of two specific heats |
| D. | Ratio of two specific heats |
| Answer» C. Product of two specific heats | |
| 678. |
The sum of internal energy (U) and the product of pressure and volume (p.v) is known as |
| A. | Work done |
| B. | Entropy |
| C. | Power |
| D. | Enthalpy |
| Answer» E. | |
| 679. |
The specific heat of air increases with increase in |
| A. | Temperature |
| B. | Pressure |
| C. | Both pressure and temperature |
| D. | Variation of its constituents |
| Answer» B. Pressure | |
| 680. |
One kg of carbon monoxide requires 4/7 kg of oxygen and produces%! |
| A. | 11/3 kg of carbon dioxide gas |
| B. | 7/3 kg of carbon monoxide gas |
| C. | 11/7 kg of carbon dioxide gas |
| D. | 8/3 kg of carbon monoxide gas |
| Answer» D. 8/3 kg of carbon monoxide gas | |
| 681. |
One kg of hydrogen requires 8 kg of oxygen and produces%! |
| A. | 1 kg of water |
| B. | 7 kg of water |
| C. | 8 kg of water |
| D. | 9 kg of water |
| Answer» E. | |
| 682. |
The efficiency of Carnot cycle depends upon%! |
| A. | Temperature limits |
| B. | Volume compression ratio |
| C. | Cut-off ratio and compression ratio |
| D. | Pressure ratio |
| Answer» B. Volume compression ratio | |
| 683. |
Petrol is distilled at%! |
| A. | 65° to 220°C |
| B. | 220° to 345°C |
| C. | 345° to 470°C |
| D. | 470° to 550°C |
| Answer» B. 220¬¨‚àû to 345¬¨‚àûC | |
| 684. |
General gas equation is%! |
| A. | PV=nRT |
| B. | PV=mRT |
| C. | PV = C |
| D. | PV=KiRT |
| Answer» C. PV = C | |
| 685. |
In S. I. units, the value of the universal gas constant is%! |
| A. | 8.314 J/kg mole-K |
| B. | 83.14 J/kg mole-K |
| C. | 831.4 J/kg mole-K |
| D. | 8314 J/kg mole-K |
| Answer» E. | |
| 686. |
If value of n is infinitely large in a polytropic process pVn = C, then the process is known as constant%! |
| A. | Volume |
| B. | Pressure |
| C. | Temperature |
| D. | Enthalpy |
| Answer» B. Pressure | |
| 687. |
The processes occurring in open system which permit the transfer of mass to and from the system, are known as%! |
| A. | Flow processes |
| B. | Non-flow processes |
| C. | Adiabatic processes |
| D. | None of these |
| Answer» B. Non-flow processes | |
| 688. |
When gas is heated at constant pressure, the heat supplied is utilized in%! |
| A. | Increasing the internal energy of gas |
| B. | Doing some external work |
| C. | Increasing the internal energy of gas and also for doing some external work |
| D. | None of the above |
| Answer» D. None of the above | |
| 689. |
Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as%! |
| A. | Zeroth law of thermodynamics |
| B. | First law of thermodynamics |
| C. | Second law of thermodynamics |
| D. | Kinetic theory of gases |
| Answer» C. Second law of thermodynamics | |
| 690. |
In a steady flow process, the ratio of%! |
| A. | Heat transfer is constant |
| B. | Work transfer is constant |
| C. | Mass flow at inlet and outlet is same |
| D. | All of these |
| Answer» E. | |
| 691. |
Kerosene is distilled at%! |
| A. | 65° to 220°C |
| B. | 220° to 345°C |
| C. | 345° to 470°C |
| D. | 470° to 550°C |
| Answer» C. 345¬¨‚àû to 470¬¨‚àûC | |
| 692. |
The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.%! |
| A. | 1 g |
| B. | 10 g |
| C. | 100 g |
| D. | 1000 g |
| Answer» E. | |
| 693. |
The variables which control the physical properties of a perfect gas are%! |
| A. | Pressure exerted by the gas |
| B. | Volume occupied by the gas |
| C. | Temperature of the gas |
| D. | All of these |
| Answer» E. | |
| 694. |
A tri-atomic molecule consists of __________ atoms.%! |
| A. | Three |
| B. | One |
| C. | Two |
| D. | Four |
| Answer» B. One | |
| 695. |
For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.%! |
| A. | Greater than |
| B. | Less than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 696. |
The gas constant (R) is equal to the%! |
| A. | Sum of two specific heats |
| B. | Difference of two specific heats |
| C. | Product of two specific heats |
| D. | Ratio of two specific heats |
| Answer» C. Product of two specific heats | |
| 697. |
Change in enthalpy of a system is the heat supplied at%! |
| A. | Constant pressure |
| B. | Constant temperature |
| C. | Constant volume |
| D. | Constant entropy |
| Answer» B. Constant temperature | |
| 698. |
The unit of length in S.I. units is%! |
| A. | Meter |
| B. | Centimeter |
| C. | Kilometer |
| D. | Millimeter |
| Answer» B. Centimeter | |
| 699. |
According to kinetic theory of gases, the absolute zero temperature is attained when%! |
| A. | Volume of the gas is zero |
| B. | Pressure of the gas is zero |
| C. | Kinetic energy of the molecules is zero |
| D. | Specific heat of gas is zero |
| Answer» D. Specific heat of gas is zero | |
| 700. |
According to which law, all perfect gases change in volume by 1/273th of their original volume at 0°C for every 1°C change in temperature when pressure remains constant%! |
| A. | Joule's law |
| B. | Boyle's law |
| C. | Gay Lussac’s law |
| D. | Charles' law |
| Answer» E. | |