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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2351. |
In ideal machines, mechanical advantage is __________ velocity ratio. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» B. less than | |
| 2352. |
Two bodies of masses m1,and m2 are hung from the ends of a rope, passing oyer a frictionless pulley as shown in the figure below. The acceleration of the string will be |
| A. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/41-204-2.png"> |
| B. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/41-204-3.png"> |
| C. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/41-204-4.png"> |
| D. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/41-204-5.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/engineering-mechanics/41-204-3.png"> | |
| 2353. |
According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then |
| A. | their algebraic sum is zero |
| B. | their lines of action are at equal distances |
| C. | the algebraic sum of their moments about any point in their plane is zero |
| D. | the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point. |
| Answer» D. the algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point. | |
| 2354. |
A lift moves downwards with an acceleration of 9.8 m/s2. The pressure exerted by a man on the floor of the lift is zero. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2355. |
Non-coplaner concurrent forces are those forces which |
| A. | meet at one point, but their lines of action do not lie on the same plane |
| B. | do not meet at one point and their lines of action do not lie on the same plane |
| C. | meet at one point and their lines of action also lie on the same plane |
| D. | do not meet at one point, but their lines of action lie on the same plane |
| Answer» B. do not meet at one point and their lines of action do not lie on the same plane | |
| 2356. |
The periodic time of one oscillation for a simple pendulum is(where l = Length of the pendulum.) |
| A. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/45-255-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/45-255-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/45-255-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/45-255-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/engineering-mechanics/45-255-4.png"> | |
| 2357. |
If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body. |
| A. | change |
| B. | does not change |
| Answer» C. | |
| 2358. |
The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» B. less than | |
| 2359. |
A newton is defined as the force while acting upon a mass of one kg, produces an acceleration of 1 m / s2 in the direction of which it acts. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 2360. |
The centre of gravity of a trapezium with parallel sides a and b lies at a distance of y from the base b, as shown in the below figure. The value of y is |
| A. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-73-2.png"> |
| B. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-73-3.png"> |
| C. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-73-4.png"> |
| D. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-73-5.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/engineering-mechanics/29-73-5.png"> | |
| 2361. |
A machine having an efficiency less than 50%, is known as |
| A. | reversible machine |
| B. | non-reversible machine |
| C. | neither reversible nor non-reversible machine |
| D. | ideal machine |
| Answer» C. neither reversible nor non-reversible machine | |
| 2362. |
If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be |
| A. | same |
| B. | half |
| C. | double |
| Answer» B. half | |
| 2363. |
The point, through which the whole weight of the body acts, irrespective of its position, is known as |
| A. | moment of inertia |
| B. | centre of gravity |
| C. | centre of percussion |
| D. | centre of mass |
| Answer» C. centre of percussion | |
| 2364. |
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is |
| A. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-4.png"> |
| Answer» B. <img src="/_files/images/mechanical-engineering/engineering-mechanics/31-87-2.png"> | |
| 2365. |
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as |
| A. | Newton's first law of motion |
| B. | Newton's second law of motion |
| C. | Newton's third law of motion |
| D. | none of these |
| Answer» C. Newton's third law of motion | |
| 2366. |
The principal constituents of a fuel are |
| A. | carbon and hydrogen |
| B. | oxygen and hydrogen |
| C. | sulphur and oxygen |
| D. | sulphur and hydrogen |
| Answer» B. oxygen and hydrogen | |
| 2367. |
A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as |
| A. | cracking |
| B. | carbonisation |
| C. | fractional distillation |
| D. | full distillation |
| Answer» B. carbonisation | |
| 2368. |
If in the equation pvn = C, the value of n = 1, then the process is called isothermal process. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2369. |
A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is |
| A. | -140 kJ |
| B. | -80 kJ |
| C. | -40 kJ |
| D. | +60 kJ |
| Answer» E. | |
| 2370. |
The atomic mass of sulphur is |
| A. | 12 |
| B. | 14 |
| C. | 16 |
| D. | 32 |
| Answer» E. | |
| 2371. |
The specific volume of a system is an __________ property. |
| A. | extensive |
| B. | intensive |
| Answer» C. | |
| 2372. |
By decreasing the highest temperature in the Carnot cycle, its efficiency is increased. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2373. |
Workdone during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and = Ratio of specific heats) |
| A. | <img src="/_files/images/mechanical-engineering/thermodynamics/243-121-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/thermodynamics/243-121-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/thermodynamics/243-121-3.png"> |
| D. | all of these |
| Answer» E. | |
| 2374. |
The __________ is obtained when carbonisation of coal is carried out at 500 to 700 C. |
| A. | soft coke |
| B. | hard coke |
| C. | pulverised coal |
| D. | bituminous coal |
| Answer» B. hard coke | |
| 2375. |
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 | |
| 2376. |
The heat and work are mutually convertible. This statement is called __________ law of thermodynamics. |
| A. | Zeroth |
| B. | First |
| C. | Second |
| Answer» C. Second | |
| 2377. |
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 | |
| 2378. |
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 | |
| 2379. |
Carnot cycle has maximum efficiency for |
| A. | petrol engine |
| B. | diesel engine |
| C. | reversible engine |
| D. | irreversible engine |
| Answer» D. irreversible engine | |
| 2380. |
The elements are made up of minute and chemically invisible particles as atoms. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2381. |
It is __________ to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work. |
| A. | possible |
| B. | impossible |
| Answer» C. | |
| 2382. |
The mass of flue gas per kg of fuel is the ratio of the |
| A. | mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel |
| B. | mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas |
| C. | mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel |
| D. | mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas |
| Answer» D. mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas | |
| 2383. |
One molecule of oxygen is __________ times heavier than the hydrogen atom. |
| A. | 12 |
| B. | 14 |
| C. | 16 |
| D. | 32 |
| Answer» E. | |
| 2384. |
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 | |
| 2385. |
The amount of heat obtained by the complete combustion of 1 kg of a fuel when the products of its combustion are cooled down to the temperature of supplied air is called __________ calorific value offuel. |
| A. | higher |
| B. | lower |
| Answer» B. lower | |
| 2386. |
The property of the system, whose value for the entire system is equal to the sum of their values for the individual parts of the system is called extensive property |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 2387. |
A good fuel should have __________ ignition point. |
| A. | high |
| B. | low |
| Answer» C. | |
| 2388. |
According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible. |
| A. | first kind |
| B. | second kind |
| Answer» C. | |
| 2389. |
Coal gas consists mainly of hydrogen, carbon monoxide and various hydrocarbons. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 2390. |
High air-fuel ratio in gas turbines |
| A. | increases power output |
| B. | improves thermal efficiency |
| C. | reduces exhaust temperature |
| D. | do not damage turbine blades |
| Answer» D. do not damage turbine blades | |
| 2391. |
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 |
| Answer» B. No | |
| 2392. |
For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order |
| A. | Dual cycle, Diesel cycle, Otto cycle |
| B. | Otto cycle, Diesel cycle, Dual cycle |
| C. | Dual cycle, Otto cycle, Diesel cycle |
| D. | Diesel cycle, Otto cycle, Dual cycle |
| Answer» B. Otto cycle, Diesel cycle, Dual cycle | |
| 2393. |
The molecular mass of a substance is the number of times a molecule of that substance is heavier than the hydrogen atom. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2394. |
The behaviour of super-heated vapour is similar to that of |
| A. | perfect gas |
| B. | air |
| C. | steam |
| D. | ordinary gas |
| Answer» B. air | |
| 2395. |
Briquetted coal is produced from the finely ground coal by moulding under pressure with or without a binding material. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2396. |
Which of the following statement is correct according to Clausis statement of second law off thermodynamics? |
| A. | It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature. |
| B. | It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source. |
| C. | It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle. |
| D. | none of the above |
| Answer» C. It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle. | |
| 2397. |
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 | |
| 2398. |
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 | |
| 2399. |
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. | |
| 2400. |
When a perfect gas is expanded through an aperture of minute dimensions, the process is known as |
| A. | isothermal process |
| B. | adiabatic process |
| C. | free expansion process |
| D. | throttling process |
| Answer» E. | |