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MCQOPTIONS
This section includes 977 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The indicator using Watt mechanism is known as |
| A. | Thompson indicator |
| B. | Richard indicator |
| C. | Simplex indicator |
| D. | Thomson indicator |
| Answer» C. Simplex indicator | |
| 152. |
The number of links in pantograph mechanism is equal to |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 153. |
In the two rotor system as shown in the below figure (I₁ < I₂), a node of vibration is situated |
| A. | Between I₁, and I₂ but nearer I₁ |
| B. | Between I₁, and I₂ but nearer to I₂ |
| C. | Exactly in the middle of the shaft |
| D. | Nearer to I₁ but outside |
| Answer» C. Exactly in the middle of the shaft | |
| 154. |
The periodic time is given by (where ω = Angular velocity of the particle in rad/s) |
| A. | ω/2π |
| B. | 2π/ω |
| C. | ω × 2π |
| D. | π/ω |
| Answer» C. ω × 2π | |
| 155. |
Hart mechanism has |
| A. | Eight links |
| B. | Six links |
| C. | Four links |
| D. | Twelve links |
| Answer» C. Four links | |
| 156. |
In a hydrodynamic journal bearing, there is |
| A. | A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing |
| B. | A thick film of lubricant between the journal and the bearing |
| C. | No lubricant between the journal and the bearing |
| D. | A forced lubricant between the journal and the bearing |
| Answer» C. No lubricant between the journal and the bearing | |
| 157. |
A governor is said to be stable, if the |
| A. | Radius of rotation of balls increases as the equilibrium speed decreases |
| B. | Radius of rotation of balls decreases as the equilibrium speed decreases |
| C. | Radius of rotation of balls increases as the equilibrium speed increases |
| D. | Radius of rotation of balls decreases as the equilibrium speed increases |
| Answer» D. Radius of rotation of balls decreases as the equilibrium speed increases | |
| 158. |
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 | |
| 159. |
In multi V-belt transmission, if one of the belt is broken, we have to change the |
| A. | Broken belt |
| B. | Broken belt and its adjacent belts |
| C. | All the belts |
| D. | There is no need of changing any one as remaining belts can take care of transmission of load |
| Answer» D. There is no need of changing any one as remaining belts can take care of transmission of load | |
| 160. |
The unbalanced primary forces in a reciprocating engine are |
| A. | Balanced completely |
| B. | Balanced partially |
| C. | Balanced by secondary forces |
| D. | Not balanced |
| Answer» C. Balanced by secondary forces | |
| 161. |
Carnot cycle is |
| A. | a reversible cycle |
| B. | an irreversible cycle |
| C. | a semi-reversible cycle |
| D. | a quasi static cycle |
| Answer» B. an irreversible cycle | |
| 162. |
Elements of pairs held together mechanically is known as |
| A. | Closed pair |
| B. | Open pair |
| C. | Mechanical pair |
| D. | Rolling pair |
| Answer» B. Open pair | |
| 163. |
A spring controlled governor is said to be unstable when the controlling force |
| A. | Increases as the radius of rotation decreases |
| B. | Increases as the radius of rotation increases |
| C. | Decreases as the radius of rotation increases |
| D. | Remains constant for all radii of rotation |
| Answer» D. Remains constant for all radii of rotation | |
| 164. |
A spring controlled governor is said to be isochronous when the controlling force |
| A. | Increases as the radius of rotation decreases |
| B. | Increases as the radius of rotation increases |
| C. | Decreases as the radius of rotation increases |
| D. | Remain constant for all radii of rotation |
| Answer» E. | |
| 165. |
Angular acceleration of a link can be determined by dividing the |
| A. | Centripetal component of acceleration with length of link |
| B. | Tangential component of acceleration with length of link |
| C. | Resultant acceleration with length of link |
| D. | All of the above |
| Answer» C. Resultant acceleration with length of link | |
| 166. |
In a ball bearing, ball and bearing forms a |
| A. | Turning pair |
| B. | Rolling pair |
| C. | Screw pair |
| D. | Spherical pair |
| Answer» C. Screw pair | |
| 167. |
The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the |
| A. | Pitch circle |
| B. | Base circle |
| C. | Pitch curve |
| D. | Prime circle |
| Answer» D. Prime circle | |
| 168. |
The sense of Coriolis component 2 ωv is same as that of the relative velocity vector v rotated at |
| A. | 45° in the direction of rotation of the link containing the path |
| B. | 45° in the direction opposite to the rotation of the link containing the path |
| C. | 90° in the direction of rotation of the link containing the path |
| D. | 180° in the direction opposite to the rotation of the link containing the path |
| Answer» D. 180° in the direction opposite to the rotation of the link containing the path | |
| 169. |
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. | |
| 170. |
In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is |
| A. | Equal to sum of other two |
| B. | Greater than sum of other two |
| C. | Less than sum of other two |
| D. | There is no such relationship |
| Answer» D. There is no such relationship | |
| 171. |
The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base) |
| A. | sinφ + sinα = b/c |
| B. | cosφ - sinα = c/b |
| C. | cotφ - cotα = c/b |
| D. | tanφ + cotα = b/c |
| Answer» D. tanφ + cotα = b/c | |
| 172. |
The dynamic friction is the friction experienced by a body, when the body |
| A. | Is in motion |
| B. | Is at rest |
| C. | Just begins to slide over the surface of the other body |
| D. | None of the above |
| Answer» B. Is at rest | |
| 173. |
Module of a gear is |
| A. | D/T |
| B. | T/D |
| C. | 2D/T |
| D. | 2T/D |
| Answer» B. T/D | |
| 174. |
The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load) |
| A. | 0.4985/ √δS |
| B. | 0.5615/ √δS |
| C. | 0.571/ √δS |
| D. | 0.6253/ √δS |
| Answer» C. 0.571/ √δS | |
| 175. |
The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is |
| A. | Flexible coupling |
| B. | Universal coupling |
| C. | Chain coupling |
| D. | Oldham's coupling |
| Answer» C. Chain coupling | |
| 176. |
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as |
| A. | Simple pendulum |
| B. | Compound pendulum |
| C. | Torsional pendulum |
| D. | Second's pendulum |
| Answer» C. Torsional pendulum | |
| 177. |
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface) |
| A. | (1/2) μ W R |
| B. | (2/3) μ W R |
| C. | (3/4) μ W R |
| D. | μ W R |
| Answer» B. (2/3) μ W R | |
| 178. |
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, 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 | |
| 179. |
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to |
| A. | Reduce vibration |
| B. | Reduce slip |
| C. | Ensure uniform loading |
| D. | Ensure proper alignment |
| Answer» D. Ensure proper alignment | |
| 180. |
In railway axle boxes, the bearing used is |
| A. | Deep groove ball bearing |
| B. | Double row self aligning ball bearing |
| C. | Double row spherical roller bearing |
| D. | Cylindrical roller bearing |
| Answer» D. Cylindrical roller bearing | |
| 181. |
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 34 |
| Answer» B. 20 | |
| 182. |
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to |
| A. | 0° and 90° |
| B. | 90° and 180° |
| C. | 135° and 315° |
| D. | 270° and 360° |
| Answer» D. 270° and 360° | |
| 183. |
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to |
| A. | 90° and 180° |
| B. | 45° and 225° |
| C. | 180° and 270° |
| D. | 270° and 360° |
| Answer» C. 180° and 270° | |
| 184. |
The lower pair is a |
| A. | Open pair |
| B. | Closed pair |
| C. | Sliding pair |
| D. | Point contact pair |
| Answer» C. Sliding pair | |
| 185. |
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. | 2θ |
| D. | 4θ |
| Answer» D. 4θ | |
| 186. |
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke) |
| A. | m.ω².r cosθ |
| B. | c.m.ω².r sinθ |
| C. | (1 - c).m.ω².r (cosθ - sinθ) |
| D. | m.ω².r (cosθ - sinθ) |
| Answer» D. m.ω².r (cosθ - sinθ) | |
| 187. |
The radial distance of a tooth from the pitch circle to the bottom of the tooth is called |
| A. | Dedendum |
| B. | Addendum |
| C. | Clearance |
| D. | Working depth |
| Answer» B. Addendum | |
| 188. |
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 | |
| 189. |
In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from |
| A. | 10°-15° |
| B. | 15°-25° |
| C. | 25°-30° |
| D. | 30°-40° |
| Answer» D. 30°-40° | |
| 190. |
A point on a connecting link (excluding end points) of a double slider crank mechanism traces a |
| A. | Straight line path |
| B. | Hyperbolic path |
| C. | Parabolic path |
| D. | Elliptical path |
| Answer» E. | |
| 191. |
To obviate axial thrust, following gear drive is used |
| A. | Double helical gears having opposite teeth |
| B. | Double helical gears having identical teeth |
| C. | Single helical gear in which one of the teeth of helix angle a is more |
| D. | Mutter gears |
| Answer» B. Double helical gears having identical teeth | |
| 192. |
In which of the following type of gear train the first gear and the last gear are co-axial. |
| A. | Simple gear train |
| B. | Compound gear train |
| C. | Reverted gear train |
| D. | None of the above |
| Answer» D. None of the above | |
| 193. |
Rectilinear motion of piston is converted into rotary by |
| A. | Cross head |
| B. | Slider crank |
| C. | Connecting rod |
| D. | Gudgeon pin |
| Answer» C. Connecting rod | |
| 194. |
The method of direct and reverse cranks is used in engines for |
| A. | The control of speed fluctuations |
| B. | Balancing of forces and couples |
| C. | Kinematic analysis |
| D. | Vibration analysis |
| Answer» C. Kinematic analysis | |
| 195. |
The gear train usually employed in clocks is a |
| A. | Simple gear train |
| B. | Reverted gear train |
| C. | Sun and planet gear |
| D. | Differential gear |
| Answer» C. Sun and planet gear | |
| 196. |
Maximum fluctuation of energy in a flywheel is equal to [where I = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, CS = Coefficient of fluctuation of speed, and ω = Mean angular speed = (ω₁ + ω₂)/2] |
| A. | I.ω.(ω₁ - ω₂) |
| B. | I.ω².CS |
| C. | 2.E.CS |
| D. | All of these |
| Answer» E. | |
| 197. |
In higher pair, the relative motion is |
| A. | Purely turning |
| B. | Purely sliding |
| C. | Purely rotary |
| D. | Combination of sliding and turning |
| Answer» E. | |
| 198. |
A rigid body possesses ________degrees of freedom |
| A. | One |
| B. | Two |
| C. | Four |
| D. | Six |
| Answer» E. | |
| 199. |
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line |
| A. | Joining the corresponding points |
| B. | Perpendicular to line as per (A) |
| C. | Not possible to determine with these data |
| D. | At 45° to line as per (A) |
| Answer» B. Perpendicular to line as per (A) | |
| 200. |
The two parallel and coplanar 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 | |