MCQOPTIONS
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MCQOPTIONS
This section includes 425 Mcqs, each offering curated multiple-choice questions to sharpen your Graduate Aptitude Test (GATE) knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
Wood charcoal is produced by heating the wood at 100°C. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 302. |
Select the wrong statement |
| A. | A Joule cycle consists of two constant volume and two isentropic processes. |
| B. | An Otto cycle consists of two constant volume and two isentropic processes. |
| C. | An Ericsson cycle consists of two constant pressure and two isothermal processes. |
| D. | all of the above |
| Answer» B. An Otto cycle consists of two constant volume and two isentropic processes. | |
| 303. |
The efficiency of Otto cycle depends upon the specific heats of the working substance. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 304. |
The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called |
| A. | specific heat at constant volume |
| B. | specific heat at constant pressure |
| C. | kilo Joule |
| D. | none of these |
| Answer» B. specific heat at constant pressure | |
| 305. |
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° to 345°C | |
| 306. |
Stirling and Ericsson cycles are |
| A. | reversible cycles |
| B. | irreversible cycles |
| C. | semi-reversible cycles |
| D. | quasi-static cycles |
| Answer» B. irreversible cycles | |
| 307. |
In an ideal gas turbine plant, it is assumed that the compression and expansion processes are |
| A. | isothermal |
| B. | isentropic |
| C. | polytropic |
| D. | none of these |
| Answer» C. polytropic | |
| 308. |
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. | |
| 309. |
Select the correct statement as per Charles' law |
| A. | p.v = constant, if T is kept constant |
| B. | v/T = constant, if p is kept constant |
| C. | p/T = constant, if v is kept constant |
| D. | T/p = constant, if v is kept constant |
| Answer» C. p/T = constant, if v is kept constant | |
| 310. |
One kg of sulphur requires 1 kg of oxygen for complete combustion and produces 2 kg of sulphur dioxide. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 311. |
The amount of heat generated per kg of fuel is known as |
| A. | calorific value |
| B. | heat energy |
| C. | lower calorific value |
| D. | higher calorific value |
| Answer» B. heat energy | |
| 312. |
If in the equation pvn = C, the value of n = 1, then the process is called isothermal process. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 313. |
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle |
| A. | combustion is at constant volume |
| B. | expansion and compression are isentropic |
| C. | maximum temperature is higher |
| D. | heat rejection is lower |
| Answer» E. | |
| 314. |
The amount of heat required to raise the temperature of unit mass of a gas through one degree at constant pressure is called specific heat at constant pressure. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 315. |
When the finely ground coal is moulded under pressure with or without a binding material, the resulting fuel is called briquetted coal. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 316. |
One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas. |
| A. | All |
| B. | 4/7 |
| C. | 11/4 |
| D. | 9/7 |
| Answer» C. 11/4 | |
| 317. |
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 | |
| 318. |
The bomb calorimeter is used for finding the __________ calorific value of solid and liquid fuels. |
| A. | higher |
| B. | lower |
| C. | Can't say |
| D. | None of these |
| Answer» B. lower | |
| 319. |
The molecular mass expresssed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of |
| A. | 0.224 litres |
| B. | 2.24 litres |
| C. | 22.4 litres |
| D. | 224 litres |
| Answer» D. 224 litres | |
| 320. |
All perfect gases change in volume by 1 / 273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called |
| A. | Boyle's law |
| B. | Charles' law |
| C. | Gay-Lussac law |
| D. | Joule's law |
| Answer» C. Gay-Lussac law | |
| 321. |
The value of cp/cv for air is |
| A. | 1 |
| B. | 1.4 |
| C. | 1.8 |
| D. | 23 |
| Answer» C. 1.8 | |
| 322. |
Second law of thermodynamics defines |
| A. | heat |
| B. | work |
| C. | internal energy |
| D. | entropy |
| Answer» E. | |
| 323. |
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 | |
| 324. |
For the same compression ratio, the efficiency of dual combustion cycle is |
| A. | greater than Diesel cycle and less than Otto cycle |
| B. | less than Diesel cycle and greater than Otto cycle |
| C. | greater than Diesel cycle |
| D. | less than Diesel cycle |
| Answer» B. less than Diesel cycle and greater than Otto cycle | |
| 325. |
The compression ratio for petrol engines is |
| A. | 3 to 6 |
| B. | 5 to 8 |
| C. | 15 to 20 |
| D. | 20 to 30 |
| Answer» C. 15 to 20 | |
| 326. |
The free expansion process is a constant enthalpy process. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 327. |
The volumetric or molar specific heat at constant pressure is the product of |
| A. | molecular mass of the gas and the specific heat at constant volume |
| B. | atomic mass of the gas and the gas constant |
| C. | molecular mass of the gas and the gas constant |
| D. | none of the above |
| Answer» E. | |
| 328. |
A molecule consisting of one atom is known as |
| A. | monoatomic |
| B. | diatomic |
| C. | triatomic |
| D. | polyatomic |
| Answer» B. diatomic | |
| 329. |
Coke is produced |
| A. | when coal is first dried and then crushed to a fine powder by pulverising machine |
| B. | from the finely ground coal by moulding under pressure with or without a binding material |
| C. | when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel |
| D. | by heating wood with a limited supply of air to a temperature not less than 280°C |
| Answer» D. by heating wood with a limited supply of air to a temperature not less than 280°C | |
| 330. |
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. | |
| 331. |
The natural solid fuel is |
| A. | wood |
| B. | coke |
| C. | anthracite coal |
| D. | pulverised coal |
| Answer» B. coke | |
| 332. |
The behaviour of super-heated vapour is similar to that of |
| A. | perfect gas |
| B. | air |
| C. | steam |
| D. | ordinary gas |
| Answer» B. air | |
| 333. |
One m³ of methane (CH₄) requires 2m³ of oxygen and produces 1m³ of carbon dioxide and 2m³ of water or steam. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 334. |
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° to 470°C | |
| 335. |
The condition for the reversibility of a cycle is |
| A. | the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process |
| B. | all the processes, taking place in the cycle of operation, must be extremely slow |
| C. | the working parts of the engine must be friction free |
| D. | all of the above |
| Answer» E. | |
| 336. |
A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as |
| A. | reversible cycle |
| B. | irreversible cycle |
| C. | thermodynamic cycle |
| D. | none of these |
| Answer» D. none of these | |
| 337. |
The atomic mass of oxygen is |
| A. | 12 |
| B. | 14 |
| C. | 16 |
| D. | 32 |
| Answer» D. 32 | |
| 338. |
A process, in which the temperature of the working substance remains constant during its expansion or compression, is called |
| A. | isothermal process |
| B. | hyperbolic process |
| C. | adiabatic process |
| D. | polytropic process |
| Answer» B. hyperbolic process | |
| 339. |
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 conservation of energy |
| C. | law of degradation of energy |
| D. | none of these |
| Answer» B. law of conservation of energy | |
| 340. |
The kinetic energy of molecules of a gas becomes zero at absolute zero temperature. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 341. |
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 | |
| 342. |
First law of thermodynamics deals with |
| A. | conservation of heat |
| B. | conservation of momentum |
| C. | conservation of mass |
| D. | conservation of energy |
| Answer» E. | |
| 343. |
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 | |
| 344. |
The gas constant (R) is equal to the __________ of two specific heats. |
| A. | sum |
| B. | difference |
| C. | product |
| D. | ratio |
| Answer» C. product | |
| 345. |
The efficiency of the Carnot cycle may be increased by |
| A. | increasing the highest temperature |
| B. | decreasing the highest temperature |
| C. | increasing the lowest temperature |
| D. | keeping the lowest temperature constant |
| Answer» B. decreasing the highest temperature | |
| 346. |
The gas turbine cycle with regenerator improves |
| A. | thermal efficiency |
| B. | work ratio |
| C. | avoids pollution |
| D. | none of these |
| Answer» B. work ratio | |
| 347. |
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. | |
| 348. |
When coal is first dried and then crushed to a fine powder by pulverising machine, the resulting fuel is called |
| A. | wood charcoal |
| B. | bituminous coal |
| C. | briquetted coal |
| D. | none of these |
| Answer» E. | |
| 349. |
In a reversible adiabatic process, the ratio of T1/T2 is equal to |
| A. | (p2/p1)γ - 1/ γ |
| B. | (p1/p2)γ - 1/ γ |
| C. | (v2/v1)γ - 1/ γ |
| D. | (v1/v2)γ - 1/ γ |
| Answer» C. (v2/v1)γ - 1/ γ | |
| 350. |
The efficiency of Diesel cycle increases with increase in cut-off. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |