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.
| 151. |
Under logarithmic decrement, the amplitude of successive vibrations are |
| A. | constant |
| B. | in arithmetic progression |
| C. | in geometric progression |
| D. | in logarithmic progression |
| Answer» D. in logarithmic progression | |
| 152. |
The coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 153. |
The coefficient of fluctuation of energy is the ratio of maximum energy to the minimum energy. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 154. |
The magnitude of linear velocity of a point B on a link AB relative to point A is (where ω = Angular velocity of the link AB) |
| A. | ω x AB |
| B. | ω (AB)2 |
| C. | ω² x AB |
| D. | (ω x AB)2 |
| Answer» B. ω (AB)2 | |
| 155. |
The mechanism in which two are turning pairs and two are sliding pairs, is called a |
| A. | double slider crank chain |
| B. | elliptical trammel |
| C. | Scotch yoke mechanism |
| D. | all of these |
| Answer» E. | |
| 156. |
A slender shaft supported on two bearings at its ends carries a disc with an eccentricity e from the axis of rotation. The critical speed of the shaft is Nc. If the disc is replaced by a second one of same mass but mounted with an eccentricily 2 e, then the critical speed of the shaft in the second case is |
| A. | Nc/2 |
| B. | Nc/2 |
| C. | Nc |
| D. | 2 Nc |
| Answer» D. 2 Nc | |
| 157. |
Effort of a governor is the |
| A. | mean force exerted at the sleeve for a given percentage change of speed |
| B. | workdone at the sleeve for maximum equilibrium speed |
| C. | mean force exerted at the sleeve for maximum equilibrium speed |
| D. | none of the above |
| Answer» B. workdone at the sleeve for maximum equilibrium speed | |
| 158. |
Scotch yoke mechanism is used to generate |
| A. | sine functions |
| B. | square roots |
| C. | logarithms |
| D. | inversions |
| Answer» B. square roots | |
| 159. |
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to |
| A. | vector sum of radial component and coriolis component |
| B. | vector sum of tangential component and coriolis component |
| C. | vector sum of radial component and tangential component |
| D. | vector difference of radial component and tangential component |
| Answer» D. vector difference of radial component and tangential component | |
| 160. |
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the |
| A. | magnitude of the forces on journal |
| B. | angular velocity of journal |
| C. | clearance between journal and bearing |
| D. | radius of journal |
| Answer» E. | |
| 161. |
The maximum or minimum value of the swaying couple is |
| A. | ± c.m.ω².r |
| B. | ± a(1 - c)m.ω².r |
| C. | ± (1 - c)m.ω².r |
| D. | ± 2a(1 - c)m.ω².r |
| Answer» D. ± 2a(1 - c)m.ω².r | |
| 162. |
The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as |
| A. | completely constrained motion |
| B. | incompletely constrained motion |
| C. | successfully constrained motion |
| D. | none of these |
| Answer» B. incompletely constrained motion | |
| 163. |
The relation l = (j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to |
| A. | one lower pair and two additional links |
| B. | two lower pairs and one additional link |
| C. | two lower pairs and two additional links |
| D. | any one of these |
| Answer» C. two lower pairs and two additional links | |
| 164. |
The lower pairs are __________ pairs. |
| A. | self-closed |
| B. | force-closed |
| C. | Can't say |
| D. | None of these |
| Answer» B. force-closed | |
| 165. |
When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than |
| A. | 0.25 |
| B. | 0.5 |
| C. | 1 |
| D. | 2 |
| Answer» E. | |
| 166. |
At the node, the shaft remains unaffected by the vibration. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 167. |
The example of completely constrained motion is a |
| A. | motion of a piston in the cylinder of a steam engine |
| B. | motion of a square bar in a square hole |
| C. | motion of a shaft with collars at each end in a circular hole |
| D. | all of the above |
| Answer» E. | |
| 168. |
The Klein's diagram is used when |
| A. | crank has uniform angular velocity |
| B. | crank has non-uniform angular velocity |
| C. | crank has uniform angular accleration |
| D. | crank has non-uniform angular acceleration |
| Answer» B. crank has non-uniform angular velocity | |
| 169. |
When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a |
| A. | screw pair |
| B. | spherical pair |
| C. | turning pair |
| D. | sliding pair |
| Answer» B. spherical pair | |
| 170. |
The length of a simple pendulum which gives the same frequency as the compound pendulum, is |
| A. | kG + l₁ |
| B. | kG² + l₁ |
| C. | (kG² + l₁²)/ l₁ |
| D. | (kG + l₁²)/ l₁ |
| Answer» D. (kG + l₁²)/ l₁ | |
| 171. |
The motion between a pair which takes place in __________ is known as incompletely constrained motion. |
| A. | one direction only |
| B. | more than one direction |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 172. |
When the particles of a body moves perpendicular to its axis, then the body is said to have |
| A. | longitudinal vibration |
| B. | transverse vibration |
| C. | torsional vibration |
| D. | none of these |
| Answer» C. torsional vibration | |
| 173. |
In a shaper mechanism, the coriolis component of acceleration does not exist. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 174. |
In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by |
| A. | ω sinθ/(n² - sin²θ)1/2 |
| B. | ω cosθ/(n² - cos²θ)1/2 |
| C. | ω sinθ/(n² - cos²θ)1/2 |
| D. | ω cosθ/(n² - sin²θ)1/2 |
| Answer» E. | |
| 175. |
If the controlling force line for a spring controlled governor when produced intersects the Y-axis above the origin, then the governor is said to be unstable. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» B. Wrong | |
| 176. |
An overdamped system, when disturbed from the equilibrium position, will not cross the equilibrium position. |
| A. | Right |
| B. | Wrong |
| C. | Can't say |
| D. | None of these |
| Answer» B. Wrong | |
| 177. |
One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring) |
| A. | 2π. √(g/δ) |
| B. | 1/2π. √(g/δ) |
| C. | 2π. √(δ/g) |
| D. | 1/2π. √(δ/g) |
| Answer» C. 2π. √(δ/g) | |
| 178. |
The power of a Porter governor is equal to |
| A. | [c²/(1 + 2c)] (m + M) g.h |
| B. | [2c²/(1 + 2c)] (m + M) g.h |
| C. | [3c²/(1 + 2c)] (m + M) g.h |
| D. | [4c²/(1 + 2c)] (m + M) g.h |
| Answer» E. | |
| 179. |
Sensitiveness of the governor is defined as the ratio of the |
| A. | mean speed to the maximum equilibrium speed |
| B. | mean speed to the minimum equilibrium speed |
| C. | difference of the maximum and minimum equilibrium speeds to the mean speed |
| D. | sum of the maximum and minimum equilibrium speeds to the mean speed |
| Answer» D. sum of the maximum and minimum equilibrium speeds to the mean speed | |
| 180. |
A Porter governor is a |
| A. | pendulum type governor |
| B. | dead weight governor |
| C. | spring loaded governor |
| D. | inertia governor |
| Answer» C. spring loaded governor | |
| 181. |
The two parallel and coplaner shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as |
| A. | spur gearing |
| B. | helical gearing |
| C. | bevel gearing |
| D. | spiral gearing |
| Answer» B. helical gearing | |
| 182. |
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle) |
| A. | [(r² + R²) cosφ]/2 |
| B. | [(r² + R²) sinφ]/2 |
| C. | [(r + R) cosφ]/2 |
| D. | [(r + R) sinφ]/2 |
| Answer» E. | |
| 183. |
Efficiency of a screw jack is given by |
| A. | tan (α + φ)/tanα |
| B. | tanα/tan (α +φ) |
| C. | tan (α - φ)/tanα |
| D. | tanα/tan (α - φ) |
| Answer» C. tan (α - φ)/tanα | |
| 184. |
If the pressure angle is __________ , a reciprocating follower will jam in its bearings. |
| A. | too small |
| B. | too large |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 185. |
The partial balancing means |
| A. | balancing partially revolving masses |
| B. | balancing partially reciprocating masses |
| C. | best balancing of engines |
| D. | all of these |
| Answer» C. best balancing of engines | |
| 186. |
A spring controlled governor is said to be unstable, if the relation between the controlling force (Fc) and radius of rotation (r) is Fc = ar. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 187. |
The example of successfully constrained motion is a |
| A. | motion of an I.C. engine valve |
| B. | motion of the shaft between a foot-step bearing |
| C. | piston reciprocating inside an engine cylinder |
| D. | all of the above |
| Answer» E. | |
| 188. |
The size of cam depends upon |
| A. | base circle |
| B. | pitch circle |
| C. | prime circle |
| D. | pitch curve |
| Answer» B. pitch circle | |
| 189. |
The frequency of oscillation of a compound pendulum is (where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.) |
| A. | 2π. √(kG² + h²/gh) |
| B. | 2π. √(kG² + h²/gh) |
| C. | 1/2π. √(gh/kG² + h²) |
| D. | 1/2π. √(kG² + h²/gh) |
| Answer» D. 1/2π. √(kG² + h²/gh) | |
| 190. |
The maximum gyroscopic couple acting on the ship tends to shear the holding down bolts. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 191. |
The uniform pressure theory gives a higher frictional torque than the uniform wear theory. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 192. |
A Porter governor can not be isochronous. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 193. |
The critical speed of a shaft depends upon its |
| A. | mass |
| B. | stiffness |
| C. | mass and stiffness |
| D. | stiffness and eccentricity |
| Answer» D. stiffness and eccentricity | |
| 194. |
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 longitudinal vibration is equal to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 195. |
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the trans-missibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system) |
| A. | less than unity |
| B. | equal to unity |
| C. | greater than unity |
| D. | zero |
| Answer» D. zero | |
| 196. |
The ratio of the pitch circle diameter in millimetres to the number of teeth, is called circular pitch. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 197. |
A watt's governor can work satisfactorily at speeds from |
| A. | 60 to 80 r.p.m. |
| B. | 80 to 100 r.p.m. |
| C. | 100 to 200 r.p.m. |
| D. | 200 to 300 r.p.m. |
| Answer» B. 80 to 100 r.p.m. | |
| 198. |
The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints) |
| A. | n = (l - 1) - j |
| B. | n = 2(l - 1) - 2j |
| C. | n = 3(l - 1) - 2j |
| D. | n = 4(l - 1) - 3j |
| Answer» D. n = 4(l - 1) - 3j | |
| 199. |
If the damping factor for a vibrating system is unity, then the system will be |
| A. | over damped |
| B. | under damped |
| C. | critically damped |
| D. | without vibrations |
| Answer» D. without vibrations | |
| 200. |
When the sleeve of a Porter governor moves downwards, the governor speed |
| A. | increases |
| B. | decreases |
| C. | remains unaffected |
| D. | first increases and then decreases |
| Answer» C. remains unaffected | |