MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 220 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The secondary unbalanced force is __________ the primary unbalanced force. |
| A. | one-half |
| B. | two-third |
| C. | times |
| D. | 1/ |
| E. | times |
| Answer» E. times | |
| 102. |
The two links are said to have a pure rolling contact, when their instantaneous centre __________ on their point of contact. |
| A. | lies |
| B. | does not lie |
| Answer» B. does not lie | |
| 103. |
The brake commonly used in motor cars is internal expanding brake. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 104. |
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 | |
| 105. |
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. | |
| 106. |
A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if |
| A. | the sum of the two masses is equal to the total mass of body |
| B. | the centre of gravity of the two masses coincides with that of the body |
| C. | the sum of mass moment of inertia of the masses about their centre of gravity is equal to the mass moment of inertia of the body |
| D. | all of the above |
| Answer» E. | |
| 107. |
When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in __________ directions. |
| A. | same |
| B. | opposite |
| Answer» C. | |
| 108. |
An overdamped system, when disturbed from the equilibrium position, will not cross the equilibrium position. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 109. |
The efficiency of a screw jack is dependent upon the load raised or lowered. |
| A. | True |
| B. | False |
| Answer» C. | |
| 110. |
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 |
| Answer» D. | |
| 111. |
The mechanism forms a structure, when the number of degrees of freedom () is equal to |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | -1 |
| Answer» B. 1 | |
| 112. |
The sense of coriolis component 2 ω 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 | |
| 113. |
The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical) |
| A. | sin α = |
| B. | cos α = |
| C. | tan α = |
| D. | cot α = |
| Answer» D. cot α = | |
| 114. |
The size of cam depends upon |
| A. | base circle |
| B. | pitch circle |
| C. | prime circle |
| D. | pitch curve |
| Answer» B. pitch circle | |
| 115. |
The sensitiveness of a governor depends upon the lift of the sleeve. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 116. |
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 | |
| 117. |
A pair is said to be a kinematic pair, if the relative motion between them is completely or successfully constrained. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 118. |
The Klein's method of construction for reciprocating engine mechanism |
| A. | is a simplified version of instantaneous centre method |
| B. | utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine |
| C. | enables determination of coriolis component |
| D. | is based on the acceleration diagram |
| Answer» C. enables determination of coriolis component | |
| 119. |
The centre of suspension and centre of percussion are not interchangeable. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 120. |
The primary unbalanced force of reciprocating masses is inversely proportional to the crank radius. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 121. |
When the tip of a tooth undercuts the root on its mating gear, it is known as interference. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 122. |
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction) |
| A. | α = 45° + |
| B. | α = 45° - |
| C. | α = 90° + φ |
| D. | α = 90° - φ |
| Answer» C. α = 90° + φ | |
| 123. |
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then |
| A. | open belt drive is recommended |
| B. | crossed belt drive is recommended |
| C. | both open belt drive and crossed belt drive is recommended |
| D. | the drive is recommended depending upon the torque transmitted |
| Answer» C. both open belt drive and crossed belt drive is recommended | |
| 124. |
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 | |
| 125. |
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 | |
| 126. |
The ratio of maximum fluctuation of speed to the mean speed is called |
| A. | fluctuation of speed |
| B. | maximum fluctuation of speed |
| C. | coefficient of fluctuation of speed |
| D. | none of these |
| Answer» D. none of these | |
| 127. |
Which of the following statement is correct for involute gears? |
| A. | The interference is inherently absent. |
| B. | The variation in centre distance of shafts increases radial force. |
| C. | A convex flank is always in contact with concave flank. |
| D. | The pressure angle is constant throughout the teeth engagement. |
| Answer» E. | |
| 128. |
The brake commonly used in railway trains is |
| A. | shoe brake |
| B. | band brake |
| C. | band and block brake |
| D. | internal expanding brake |
| Answer» B. band brake | |
| 129. |
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 | |
| 130. |
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 | |
| 131. |
The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 132. |
is a four bar mechanism in which = 310 mm and = 450 mm. and are both perpendicular to the fixed link , as shown in the below figure. If the velocity of at this condition is . Then the velocity of is |
| A. | |
| B. | |
| C. | |
| Answer» D. | |
| 133. |
A rotary internal combustion engine has __________ cylinders. |
| A. | four |
| B. | five |
| C. | six |
| D. | seven |
| Answer» E. | |
| 134. |
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. | |
| 135. |
If the number of links in a mechanism are equal to , then the number of possible inversions are equal to |
| A. | - 2 |
| B. | - 1 |
| C. | + 1 |
| Answer» D. | |
| 136. |
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 | |
| 137. |
The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap. |
| A. | inner edge |
| B. | outer edge |
| Answer» B. outer edge | |
| 138. |
The stress induced in a body will be shear stress, when it is subjected to |
| A. | longitudinal vibrations |
| B. | transverse vibrations |
| C. | torsional vibrations |
| D. | none of these |
| Answer» D. none of these | |
| 139. |
A machine mounted on a single coil spring has a period of free vibration of . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become |
| A. | /16 |
| B. | /4 |
| C. | 4 |
| D. | 16 |
| Answer» C. 4 | |
| 140. |
When a body is subjected to longitudinal vibrations, the stress induced in a body will be tensile or compressive stress. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 141. |
Pitch point of a cam is |
| A. | a point on the pitch curve having minimum pressure angle |
| B. | a point on the pitch curve having maximum pressure angle |
| C. | any point on the pitch curve |
| D. | any point on the pitch circle |
| Answer» C. any point on the pitch curve | |
| 142. |
A torsional system with discs of moment of inertia and as shown in the below figure, is gear driven such that the ratio of speed of shaft to shaft is ''. Neglecting the inertia of gears, the equivalent inertia of disc on shaft at the speed of shaft is equal to |
| A. | . |
| B. | . |
| C. | / |
| D. | / |
| Answer» C. / | |
| 143. |
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. | remains constant for all radii of rotation |
| Answer» E. | |
| 144. |
The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are complex conjugate, then the system will be critically damped. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 145. |
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 | |
| 146. |
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 | |
| 147. |
A mechanism __________ for transmitting or transforming motion. |
| A. | can be used |
| B. | can not be used |
| Answer» B. can not be used | |
| 148. |
The distance moved by the valve from one end to the other end is called valve travel. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 149. |
A Watt's governor is a spring loaded governor. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 150. |
The velocity of the rubbing surface __________ with the distance from the axis of the bearing. |
| A. | increases |
| B. | decreases |
| Answer» B. decreases | |