MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 470 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Whitworth quick return motion mechanism is an inversion of a double slider crank chain. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 202. |
The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be |
| A. | parallel to each other |
| B. | perpendicular to each other |
| C. | inclined at 45° |
| D. | opposite to each other |
| Answer» C. inclined at 45° | |
| 203. |
For the isochronous Porter governor, the controlling force curve is a straight line passing through the origin. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 204. |
In a flat collar pivot bearing, the moment due to friction is proportional to |
| A. | (r₁² - r₂²)/(r₁ - r₂) |
| B. | (r₁² - r₂²)/(r₁ + r₂) |
| C. | (r₁³ - r₂³)/(r₁² - r₂²) |
| D. | (r₁³ - r₂³)/(r₁ - r₂) |
| Answer» D. (r₁³ - r₂³)/(r₁ - r₂) | |
| 205. |
The coriolis component of acceleration depends upon |
| A. | velocity of slider |
| B. | angular velocity of the link |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 206. |
Torsional vibrations are said to occur when the particles of a body moves |
| A. | perpendicular to its axis |
| B. | parallel to its axis |
| C. | in a circle about its axis |
| D. | none of these |
| Answer» D. none of these | |
| 207. |
The primary unbalanced force of reciprocating masses is inversely proportional to the crank radius. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 208. |
A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when |
| A. | a is + ve and b = 0 |
| B. | a = 0 and b is + ve |
| C. | a is + ve and b is - ve |
| D. | a is + ve and b is also + ve |
| Answer» B. a = 0 and b is + ve | |
| 209. |
Most of the engines, generally, do not require balancing of secondary forces and couples. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» B. Wrong | |
| 210. |
The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as |
| A. | structure |
| B. | machine |
| C. | inversion |
| D. | compound mechanism |
| Answer» D. compound mechanism | |
| 211. |
The height of a Watt's governor (in metres) is equal to (where N = Speed of the arm and ball about the spindle axis) |
| A. | 8.95/N² |
| B. | 89.5/N² |
| C. | 895/N² |
| D. | 8950/N² |
| Answer» D. 8950/N² | |
| 212. |
According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centres will lie on a |
| A. | straight line |
| B. | parabolic curve |
| C. | triangle |
| D. | rectangle |
| Answer» B. parabolic curve | |
| 213. |
Frequency of vibrations is usually expressed in |
| A. | number of cycles per hour |
| B. | number of cycles per minute |
| C. | number of cycles per second |
| D. | none of these |
| Answer» D. none of these | |
| 214. |
Which of the following is a spring controlled governor? |
| A. | Hartnell governor |
| B. | Hartung governor |
| C. | Wilson-Hartnell governor |
| D. | all of these |
| Answer» E. | |
| 215. |
The power transmitted by a belt is maximum when the maximum tension in the belt is __________ of centrifugal tension. |
| A. | one-third |
| B. | two-third |
| C. | double |
| D. | three times |
| Answer» E. | |
| 216. |
The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball, and M = Mass on the sleeve) |
| A. | c(m - M)g |
| B. | c(m + M)g |
| C. | c(m.M)g |
| D. | None of these |
| Answer» C. c(m.M)g | |
| 217. |
The maximum fluctuation of energy is the |
| A. | difference between the maximum and minimum energies |
| B. | sum of the maximum and minimum energies |
| C. | variations of energy above and below the mean resisting torque line |
| D. | ratio of the mean resisting torque to the workdone per cycle |
| Answer» B. sum of the maximum and minimum energies | |
| 218. |
The danger of breakage and vibration is maximum |
| A. | below the critical speed |
| B. | near the critical speed |
| C. | above the critical speed |
| D. | none of these |
| Answer» C. above the critical speed | |
| 219. |
In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be |
| A. | less sensitive |
| B. | more sensitive |
| C. | unaffected of sensitivity |
| D. | isochronous |
| Answer» B. more sensitive | |
| 220. |
Two pulleys of radii r1 and r2 and at distance x apart are connected by means of a cross belt drive. The length of the belt is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 221. |
The periodic time is given by (where ω = Angular velocity of the particle in rad/s) |
| A. | ω/2π |
| B. | 2π/ω |
| C. | ω x 2π |
| D. | π/ω |
| Answer» C. ω x 2π | |
| 222. |
The centre of gravity of a coupler link in a four bar mechanism will experience |
| A. | no acceleration |
| B. | only linear acceleration |
| C. | only angular acceleration |
| D. | both linear and angular acceleration |
| Answer» E. | |
| 223. |
The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be |
| A. | to dip the nose and tail |
| B. | to raise the nose and tail |
| C. | to raise the nose and dip the tail |
| D. | to dip the nose and raise the tail |
| Answer» D. to dip the nose and raise the tail | |
| 224. |
A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body) |
| A. | P = W tan α |
| B. | P = W tan (α + φ) |
| C. | P = W (sin α + μ cos α) |
| D. | P = W (cos α + μ sin α) |
| Answer» D. P = W (cos α + μ sin α) | |
| 225. |
The efficiency of a screw jack is dependent upon the load raised or lowered. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 226. |
A shaft of mass (mc)and stiffness (s) is fixed at one end and carries a mass (m) at the other end. The natural frequency of its transverse vibration is same as for longitudinal vibration. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 227. |
In order to give a complete secondary balance of a multi-cylinder in-line engine, |
| A. | the algebraic sum of the secondary forces must be equal to zero |
| B. | the algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 228. |
When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable. |
| A. | remains constant |
| B. | decreases |
| C. | increases |
| D. | None of these |
| Answer» C. increases | |
| 229. |
A pendulum type governor is a Watt governor. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 230. |
The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are __________ then the system will be under damped. |
| A. | equal |
| B. | real |
| C. | complex conjugate |
| D. | None of these |
| Answer» D. None of these | |
| 231. |
The direction of linear velocity of any point on a link with respect to another point on the same link is |
| A. | parallel to the link joining the points |
| B. | perpendicular to the link joining the points |
| C. | at 45° to the link joining the points |
| D. | none of the above |
| Answer» C. at 45° to the link joining the points | |
| 232. |
The secondary unbalanced force is maximum __________ in one revolution of the crank. |
| A. | two times |
| B. | four times |
| C. | eight times |
| D. | sixteen times |
| Answer» C. eight times | |
| 233. |
Which of the following is an open pair? |
| A. | Ball and socket joint |
| B. | Journal bearing |
| C. | Lead screw and nut |
| D. | Cam and follower |
| Answer» E. | |
| 234. |
A sliding pair has a completely constrained motion. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 235. |
The ratio of driving tensions for rope drive is same as that of V-belt drive. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 236. |
A body is said to vibrate with simple harmonic motion if its acceleration is proportional to the distance from the mean position. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 237. |
When a mechanism is required to transmit power or to do some particular type of work, then it becomes a machine. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 238. |
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the lengm of connecting rod to radius of crank) |
| A. | m.ω².r sin θ |
| B. | m.ω².r cos θ |
| C. | m.ω².r |
| D. | m.ω².r |
| Answer» C. m.ω².r | |
| 239. |
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will |
| A. | return to equilibriumposition without oscillation |
| B. | oscillate with increasing time period |
| C. | oscillate with decreasing amplitude |
| D. | oscillate with constant amplitude |
| Answer» C. oscillate with decreasing amplitude | |
| 240. |
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft) |
| A. | ω(r1 - r2)sin θ |
| B. | ω(r1 + r2)sinθ sec²θ |
| C. | ω(r1 - r2)cos θ |
| D. | ω(r1 + r2)cos θ cosec² θ |
| Answer» C. ω(r1 - r2)cos θ | |
| 241. |
The addendum is the radial distance of tooth from the pitch circle to the top of the tooth. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 242. |
When the tip of a tooth undercuts the root on its mating gear, it is known as interference. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 243. |
The coriolis component of acceleration exists whenever apoint moves along a path that has |
| A. | linear displacement |
| B. | rotational motion |
| C. | gravitational acceleration |
| D. | tangential acceleration |
| Answer» C. gravitational acceleration | |
| 244. |
The friction experienced by a body, when at rest, is known as static friction. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 245. |
V-belts are usually used for |
| A. | long drives |
| B. | short drives |
| C. | long and short drives |
| D. | none of these |
| Answer» C. long and short drives | |
| 246. |
The equation of free vibrations of a system is , Its natural frequency is |
| A. | 3 Hz |
| B. | 3π Hz |
| C. | 6 Hz |
| D. | 6π Hz |
| Answer» B. 3π Hz | |
| 247. |
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral C Q NO, the acceleration of the piston is zero when the crank OC and connecting rod PC are at right angles to each other. |
| A. | Correct |
| B. | Incorrect |
| C. | May be correct or incorrect |
| D. | None of these |
| Answer» B. Incorrect | |
| 248. |
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will |
| A. | cause withdrawing or throttling of steam |
| B. | reduce length of effective stroke of piston |
| C. | reduce maximum opening of port to steam |
| D. | all of these |
| Answer» C. reduce maximum opening of port to steam | |
| 249. |
For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a |
| A. | 30° V-engine |
| B. | 60° V-engine |
| C. | 120° V-engine |
| D. | 150° V-engine |
| Answer» B. 60° V-engine | |
| 250. |
When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in __________ directions. |
| A. | same |
| B. | opposite |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |