MCQOPTIONS
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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.
| 251. |
The displacement of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r1 = Minimum radius of the cam, and θ = Angle turned through by the cam) |
| A. | R(1 - cos θ) |
| B. | (R - r1)(1 - cos θ) |
| C. | R(1 - sin θ) |
| D. | (R - r1)(1 - sin θ) |
| Answer» C. R(1 - sin θ) | |
| 252. |
Which of the following is a higher pair? |
| A. | Belt and pulley |
| B. | Turning pair |
| C. | Screw pair |
| D. | Sliding pair |
| Answer» B. Turning pair | |
| 253. |
When a body is subjected to longitudinal vibrations, the stress induced in a body will be tensile or compressive stress. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 254. |
The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is |
| A. | h/(kG² + h²) |
| B. | (kG² + h²)/h |
| C. | h²/(kG² + h²) |
| D. | (kG² + h²)/h² |
| Answer» C. h²/(kG² + h²) | |
| 255. |
The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r1 = Minimum radius of the cam, r2 = Radius of the roller follower, and θ = Angle turned by the cam from the beginning of the follower displacement) |
| A. | (r1 - r2)(1 - cosθ) |
| B. | (r1 + r2)(1 + cos θ) |
| C. | (r1 - r2) |
| D. | (r1 + r2) |
| Answer» E. | |
| 256. |
The velocity of a body moving with simple harmonic motion is __________ at the mean position. |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | None of these |
| Answer» D. None of these | |
| 257. |
The ratio of the number of teeth to the pitch circle diameter in millimetres, is called |
| A. | circular pitch |
| B. | diametral pitch |
| C. | module |
| D. | none of these |
| Answer» C. module | |
| 258. |
The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called |
| A. | radial component |
| B. | tangential component |
| C. | coriolis component |
| D. | none of these |
| Answer» B. tangential component | |
| 259. |
The centrifugal tension on the belt has no effect on the power transmitted. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 260. |
The maximum frictional force, which comes into play, when an body just begins to slide over the surface of the other body, is known as |
| A. | static friction |
| B. | dynamic friction |
| C. | limiting friction |
| D. | coefficient of friction |
| Answer» D. coefficient of friction | |
| 261. |
In a four stroke I.C. engine, the turning moment during the compression stroke is |
| A. | positive throughout |
| B. | negative throughout |
| C. | positive during major portion of the stroke |
| D. | negative during major portion of the stroke |
| Answer» C. positive during major portion of the stroke | |
| 262. |
The module is the reciprocal of diametral pitch. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 263. |
The relation between number of links (l) and number of joints (j) in a kinematic chain is |
| A. | l = (j + 2) |
| B. | l = (j + 2) |
| C. | l = (j + 3) |
| D. | l = j + 4 |
| Answer» D. l = j + 4 | |
| 264. |
When the connection between the elements forming a pair is such that the constrained motion is not completed by itself, but by some other means, the motion is said to be a completely constrained motion, |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 265. |
When the two elements of a pair have __________ when in motion, it is said to a lower pair. |
| A. | line or point contact |
| B. | surface contact |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 266. |
The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap. |
| A. | inner edge |
| B. | outer edge |
| C. | Can't say |
| D. | None of these |
| Answer» B. outer edge | |
| 267. |
If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be |
| A. | four times the first one |
| B. | same as the first one |
| C. | one fourth of the first one |
| D. | one and a half times the first one |
| Answer» D. one and a half times the first one | |
| 268. |
The driving and driven shafts connected by a Hooke's joint will have equal speeds, if |
| A. | cos θ = sin α |
| B. | sin θ = ±tan α |
| C. | tan θ = ±cos α |
| D. | cot θ = cos α |
| Answer» D. cot θ = cos α | |
| 269. |
A spring controlled governor is found unstable. It can be made stable by |
| A. | increasing the spring stiffness |
| B. | decreasing the spring stiffness |
| C. | increasing the ball mass |
| D. | decreasing the ball mass |
| Answer» C. increasing the ball mass | |
| 270. |
In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| D. | None of these |
| Answer» B. less than | |
| 271. |
Which of the following property of the instantaneous centre is correct ? |
| A. | A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered. |
| B. | The two rigid links have no linear velocity relative to each other at the instantaneous centre. |
| C. | The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link. |
| D. | all of the above |
| Answer» E. | |
| 272. |
In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called |
| A. | lead |
| B. | steam lap |
| C. | exhaust lap |
| D. | none of these |
| Answer» C. exhaust lap | |
| 273. |
In a multiple V-belt drive, if one of the belt is broken, then we should replace |
| A. | the broken belt only |
| B. | all the belts |
| C. | the broken belt and the belts on either side of it |
| D. | none of the above |
| Answer» C. the broken belt and the belts on either side of it | |
| 274. |
The coriolis component of acceleration leads the sliding velocity by |
| A. | 45° |
| B. | 90° |
| C. | 135° |
| D. | 180° |
| Answer» C. 135° | |
| 275. |
A Hartnell governor is a |
| A. | dead weight governor |
| B. | pendulum type governor |
| C. | spring loaded governor |
| D. | inertia governor |
| Answer» D. inertia governor | |
| 276. |
An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called |
| A. | addendum circle |
| B. | dedendum circle |
| C. | pitch circle |
| D. | clearance circle |
| Answer» D. clearance circle | |
| 277. |
The coriolis component of acceleration acts |
| A. | along the sliding surface |
| B. | perpendicular to the sliding surface |
| C. | at 45° to the sliding surface |
| D. | parallel to the sliding surface |
| Answer» C. at 45° to the sliding surface | |
| 278. |
The instantaneous centre of a rigid thin disc rolling on a plane rigid surface is located at |
| A. | the centre of the disc |
| B. | the point of contact |
| C. | an infinite distance on the plane surface |
| D. | the point on the circumference situated vertically opposite to the contact point |
| Answer» C. an infinite distance on the plane surface | |
| 279. |
When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be |
| A. | ω² r {(n + 1)/n} |
| B. | ω² r {(n - 1)/n} |
| C. | ω² r {n/(n + 1)} |
| D. | ω² r {n/(n - 1)} |
| Answer» C. ω² r {n/(n + 1)} | |
| 280. |
A mechanism is an assemblage of |
| A. | two links |
| B. | three links |
| C. | four or more than four links |
| D. | all of these |
| Answer» D. all of these | |
| 281. |
A type-writer constitutes a machine. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 282. |
The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed. |
| A. | sum |
| B. | difference |
| C. | product |
| D. | ratio |
| Answer» E. | |
| 283. |
The angle of inclination of the plane, at which the body begins to move down the plane is called |
| A. | angle of friction |
| B. | angle of repose |
| C. | angle of projection |
| D. | none of these |
| Answer» C. angle of projection | |
| 284. |
When the primary direct crank of a reciprocating engine makes an angle of θ with the line of stroke, then the secondary direct crank will make an angle of __________ with the line of stroke. |
| A. | θ/2 |
| B. | θ |
| C. | 2 θ |
| D. | 4 θ |
| Answer» D. 4 θ | |
| 285. |
The train value of a gear train is |
| A. | equal to velocity ratio of a gear train |
| B. | reciprocal of velocity ratio of a gear train |
| C. | always greater than unity |
| D. | always less than unity |
| Answer» C. always greater than unity | |
| 286. |
Longitudinal 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» C. in a circle about its axis | |
| 287. |
The angle of the inclined plane at which the body just begins to slide down the plane, is called helix angle. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 288. |
The flank of the tooth is the surface of the tooth __________ the pitch surface. |
| A. | above |
| B. | below |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 289. |
The natural frequency of free transverse vibrations is same as that of free longitudinal vibrations. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» B. Wrong | |
| 290. |
The component of the acceleration, parallel to the velocity of the particle, at the given instant is called |
| A. | radial component |
| B. | tangential component |
| C. | coriolis component |
| D. | none of these |
| Answer» C. coriolis component | |
| 291. |
In gears, interference takes place when |
| A. | the tip of a tooth of a mating gear digs into the portion between base and root circles |
| B. | gears do not move smoothly in the absence of lubrication |
| C. | pitch of the gears is not same |
| D. | gear teeth are undercut |
| Answer» B. gears do not move smoothly in the absence of lubrication | |
| 292. |
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the |
| A. | tension in the tight side of the belt |
| B. | tension in the slack side of the belt |
| C. | sum of the tensions on the tight side and slack side of the belt |
| D. | average tension of the tight side and slack side of the belt |
| Answer» E. | |
| 293. |
In a steam engine, the distance by which the inner edge of the D-slide valve overlaps the steam port is called lead. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 294. |
In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient. |
| A. | equal to |
| B. | directly proportional to |
| C. | inversely proportional to |
| D. | independent of |
| Answer» D. independent of | |
| 295. |
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, 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» D. all of these | |
| 296. |
The relation between me number of links (l) and the number of binary joints (j) for a kinematic chain having constrained motion is given by l = l - 2. If the left hand side of this equation is greater than the right hand side, then the chain is |
| A. | locked chain |
| B. | completely constrained chain |
| C. | successfully constrained chain |
| D. | incompletely constrained chain |
| Answer» B. completely constrained chain | |
| 297. |
In a radial cam, the follower moves |
| A. | in a direction perpendicular to the cam axis |
| B. | in a direction parallel to the cam axis |
| C. | in any direction irrespective of the cam axis |
| D. | along the cam axis |
| Answer» B. in a direction parallel to the cam axis | |
| 298. |
The velocity of the belt for maximum power is (where m = Mass of the belt in kg per metre length) |
| A. | T/3 |
| B. | (T.g)/3 |
| C. | √(T/3m) |
| D. | √(3m/T) |
| Answer» D. √(3m/T) | |
| 299. |
When a point at the end of a link moves with constant angular velocity, its acceleration will have |
| A. | radial component only |
| B. | tangential component only |
| C. | coriolis component only |
| D. | radial and tangential components both |
| Answer» B. tangential component only | |
| 300. |
In a disc clutch, if there are n1 number of discs on the driving shaft and n2 number of discs on the driven shaft, then the number of pairs of contact surfaces will be |
| A. | n1 + n2 |
| B. | n1 + n2 + 1 |
| C. | n1 + n2 - 1 |
| D. | n1 + n2 - 2 |
| Answer» D. n1 + n2 - 2 | |