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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.
| 501. |
Intensive property of a system is one whose value |
| A. | Depends on the mass of the system, like volume |
| B. | Does not depend on the mass of the system, like temperature, pressure, etc. |
| C. | Is not dependent on the path followed but on the state |
| D. | Is dependent on the path followed and not on the state |
| Answer» C. Is not dependent on the path followed but on the state | |
| 502. |
The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as |
| A. | Law of equipartition of energy |
| B. | Law of degradation of energy |
| C. | Law of conservation of energy |
| D. | None of these |
| Answer» B. Law of degradation of energy | |
| 503. |
Kelvin-Planck's law deals with |
| A. | Conservation of work |
| B. | Conservation of heat |
| C. | Conversion of heat into work |
| D. | Conversion of work into heat |
| Answer» D. Conversion of work into heat | |
| 504. |
Isochoric process is one in which |
| A. | Free expansion takes place |
| B. | Very little mechanical work is done by the system |
| C. | No mechanical work is done by the system |
| D. | All parameters remain constant |
| Answer» D. All parameters remain constant | |
| 505. |
An adiabatic process is one in which |
| A. | The temperature of the gas changes |
| B. | No heat enters or leaves the gas |
| C. | The change in internal energy is equal to the mechanical work done |
| D. | All of the above |
| Answer» E. | |
| 506. |
The isothermal and adiabatic processes are regarded as |
| A. | Reversible process |
| B. | Irreversible process |
| C. | Reversible or irreversible process |
| D. | None of these |
| Answer» B. Irreversible process | |
| 507. |
The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents |
| A. | Heat absorbed |
| B. | Heat rejected |
| C. | Either heat absorbed or heat rejected |
| D. | None of these |
| Answer» D. None of these | |
| 508. |
The more effective way of increasing efficiency of Carnot engine is to |
| A. | Increase higher temperature |
| B. | Decrease higher temperature |
| C. | Increase lower temperature |
| D. | Decrease lower temperature |
| Answer» E. | |
| 509. |
In an extensive property of a thermodynamic system |
| A. | Extensive heat is transferred |
| B. | Extensive work is done |
| C. | Extensive energy is utilized |
| D. | None of these |
| Answer» E. | |
| 510. |
The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is |
| A. | 29.27 J/kmol °K |
| B. | 83.14 J/kmol °K |
| C. | 848 J/kmol °K |
| D. | 735 J/kmol °K |
| Answer» C. 848 J/kmol °K | |
| 511. |
The unit of power in S.I. units is |
| A. | Newton |
| B. | Pascal |
| C. | Erg |
| D. | Watt |
| Answer» E. | |
| 512. |
The unit of temperature in S.I. units is |
| A. | Centigrade |
| B. | Celsius |
| C. | Fahrenheit |
| D. | Kelvin |
| Answer» E. | |
| 513. |
The unit of time in S.I. units is |
| A. | Second |
| B. | Minute |
| C. | Hour |
| D. | Day |
| Answer» B. Minute | |
| 514. |
When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is |
| A. | Coke |
| B. | Wood charcoal |
| C. | Bituminous coal |
| D. | Briquetted coal |
| Answer» C. Bituminous coal | |
| 515. |
Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant. |
| A. | 1/27th |
| B. | 1/93th |
| C. | 1/173th |
| D. | 1/273th |
| Answer» E. | |
| 516. |
Those substances which have so far not been resolved by any means into other substances of simpler form are called |
| A. | Atoms |
| B. | Compounds |
| C. | Elements |
| D. | Molecules |
| Answer» D. Molecules | |
| 517. |
Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant) |
| A. | cv/ cp =R |
| B. | cp - cv = R |
| C. | cv = R/ γ-1 |
| D. | Both (B) and (C) |
| Answer» E. | |
| 518. |
One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas. |
| A. | 4/7 |
| B. | 11/4 |
| C. | 9/7 |
| D. | All of these |
| Answer» B. 11/4 | |
| 519. |
The efficiency of a gas turbine is given by |
| A. | (Net work output)/(Work-done by the turbine) |
| B. | (Net work output)/(Heat supplied) |
| C. | (Actual temperature drop)/(Isentropic temperature drop) |
| D. | (Isentropic increase in temperature)/(Actual increase in temperature) |
| Answer» C. (Actual temperature drop)/(Isentropic temperature drop) | |
| 520. |
The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected) |
| A. | δQ = T.ds |
| B. | δQ = T/ds |
| C. | dQ = ds/T |
| D. | None of these |
| Answer» B. δQ = T/ds | |
| 521. |
If in the equation pvn = C, the value of n = ∝, then the process is called |
| A. | Constant volume process |
| B. | Adiabatic process |
| C. | Constant pressure process |
| D. | Isothermal process |
| Answer» B. Adiabatic process | |
| 522. |
If the value of n = 0 in the equation pvn = C, then the process is called |
| A. | Constant volume process |
| B. | Adiabatic process |
| C. | Constant pressure process |
| D. | Isothermal process |
| Answer» D. Isothermal process | |
| 523. |
The work ratio of a gas turbine plant is given by |
| A. | (Net work output)/(Work-done by the turbine) |
| B. | (Net work output)/(Heat supplied) |
| C. | (Actual temperature drop)/(Isentropic temperature drop) |
| D. | (Isentropic increase in temperature)/(Actual increase in temperature) |
| Answer» B. (Net work output)/(Heat supplied) | |
| 524. |
A definite area or a space where some thermodynamic process takes place is known as |
| A. | Thermodynamic system |
| B. | Thermodynamic cycle |
| C. | Thermodynamic process |
| D. | Thermodynamic law |
| Answer» B. Thermodynamic cycle | |
| 525. |
Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | Internal energy |
| Answer» D. Internal energy | |
| 526. |
Which of the following is the correct statement? |
| A. | All the reversible engines have the same efficiency. |
| B. | All the reversible and irreversible engines have the same efficiency. |
| C. | Irreversible engines have maximum efficiency. |
| D. | All engines are designed as reversible in order to obtain maximum efficiency. |
| Answer» D. All engines are designed as reversible in order to obtain maximum efficiency. | |
| 527. |
The specific heat at constant volume is |
| A. | The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume |
| B. | The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure |
| C. | The amount of heat required to raise the temperature of 1 kg of water through one degree |
| D. | Any one of the above |
| Answer» B. The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure | |
| 528. |
One kilowatt is equal to |
| A. | 1 N-m/s |
| B. | 100 N-m |
| C. | 1000 N-m/s |
| D. | 1 × 106 N-m/s |
| Answer» D. 1 × 106 N-m/s | |
| 529. |
Zeroth law of thermodynamics |
| A. | Deals with conversion of mass and energy |
| B. | Deals with reversibility and irreversibility of process |
| C. | States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other |
| D. | Deals with heat engines |
| Answer» D. Deals with heat engines | |
| 530. |
The efficiency of Joule cycle is |
| A. | Less than Carnot cycle |
| B. | Equal to Carnot cycle |
| C. | Greater than Carnot cycle |
| D. | None of these |
| Answer» B. Equal to Carnot cycle | |
| 531. |
In a no flow reversible process for which p = (-3V + 15) × 105 N/m², V changes from 1 m3 to 2 m3. The work done will be about |
| A. | 100 × 10⁵ joules |
| B. | 1 × 10⁵ joules |
| C. | 10 × 10⁵ joules |
| D. | 10 × 10⁵ kilo joules |
| Answer» D. 10 × 10⁵ kilo joules | |
| 532. |
The statement that molecular weights of all gases occupy the same volume is known as |
| A. | Avogadro's hypothesis |
| B. | Dalton's law |
| C. | Gas law |
| D. | Law of thermodynamics |
| Answer» B. Dalton's law | |
| 533. |
According to Clausius statement of second law of thermodynamics |
| A. | Heat can |
| B. | Heat can be transferred for low temperature to high temperature source by using refrigeration cycle |
| C. | Heat can be transferred from low temperature to high temperature source if COP of process is more than unity |
| D. | Heat can |
| Answer» E. | |
| 534. |
Which of the following laws is applicable for the behaviour of a perfect gas? |
| A. | Boyle's law |
| B. | Charles ‘law |
| C. | Gay Lussac’s law |
| D. | All of the above |
| Answer» E. | |
| 535. |
Which of the following variables controls the physical properties of a perfect gas? |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | All of the above |
| Answer» E. | |
| 536. |
Second law of thermodynamics defines |
| A. | Heat |
| B. | Work |
| C. | Internal energy |
| D. | Entropy |
| Answer» E. | |
| 537. |
The unit of length in S.I. units is |
| A. | Meter |
| B. | Centimeter |
| C. | Kilometer |
| D. | Millimeter |
| Answer» B. Centimeter | |
| 538. |
The unit of pressure in S.I. units is |
| A. | kg/cm² |
| B. | mm of water column |
| C. | Pascal |
| D. | Dyne per square cm |
| Answer» D. Dyne per square cm | |
| 539. |
The unit of mass in S.I. units is |
| A. | Kilogram |
| B. | Gram |
| C. | Tonne |
| D. | Quintal |
| Answer» B. Gram | |
| 540. |
During which of the following process does heat rejection takes place in Carnot cycle? |
| A. | Isothermal expansion |
| B. | Isentropic expansion |
| C. | Isothermal compression |
| D. | Isentropic compression |
| Answer» D. Isentropic compression | |
| 541. |
When the expansion or compression takes place according to the law pvn = C, the process is known as |
| A. | Isothermal process |
| B. | Adiabatic process |
| C. | Hyperbolic process |
| D. | Polytropic process |
| Answer» E. | |
| 542. |
The gas constant (R) is equal to the __________ of two specific heats. |
| A. | Product |
| B. | Sum |
| C. | Difference |
| D. | Ratio |
| Answer» D. Ratio | |
| 543. |
The compression ratio is the ratio of |
| A. | Total volume to swept volume |
| B. | Swept volume to clearance volume |
| C. | Swept volume to total volume |
| D. | Total volume to clearance volume |
| Answer» E. | |
| 544. |
A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called |
| A. | Isothermal process |
| B. | Hyperbolic process |
| C. | Adiabatic process |
| D. | Polytropic process |
| Answer» C. Adiabatic process | |
| 545. |
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that |
| A. | Carnot cycle can't work with saturated steam |
| B. | Heat is supplied to water at temperature below the maximum temperature of the cycle |
| C. | A Rankine cycle receives heat at two places |
| D. | Rankine cycle is hypothetical |
| Answer» C. A Rankine cycle receives heat at two places | |
| 546. |
Which of the following is a reversible non-flow process? |
| A. | Isochoric process |
| B. | Isobaric process |
| C. | Hyperbolic process |
| D. | All of these |
| Answer» E. | |
| 547. |
If a system after undergoing a series of processes, returns to the initial state then |
| A. | Process is thermodynamically in equilibrium |
| B. | Process is executed in closed system cycle |
| C. | Its entropy will change due to irreversibility |
| D. | Sum of heat and work transfer will be zero |
| Answer» E. | |
| 548. |
For reversible adiabatic process, change in entropy is |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | Negative |
| Answer» D. Negative | |
| 549. |
When coal is first dried and then crushed to a fine powder by pulverizing machine, the resulting fuel is called |
| A. | Wood charcoal |
| B. | Bituminous coal |
| C. | Briquetted coal |
| D. | None of these |
| Answer» E. | |
| 550. |
Otto cycle consists of following four processes |
| A. | Two isothermal and two isentropic |
| B. | Two isentropic and two constant volumes |
| C. | Two isentropic, one constant volume and one constant pressure |
| D. | Two isentropic and two constant pressures |
| Answer» C. Two isentropic, one constant volume and one constant pressure | |