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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 3801. |
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. | |
| 3802. |
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 | |
| 3803. |
In a flat collar pivot bearing, the moment due to friction is proportional to |
| A. | <img src="/_files/images/mechanical-engineering/theory-of-machines/487-184-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/theory-of-machines/487-184-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/theory-of-machines/487-184-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/theory-of-machines/487-184-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/theory-of-machines/487-184-4.png"> | |
| 3804. |
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. | |
| 3805. |
In a reciprocating steam engine, which of the following forms a kinematic link? |
| A. | Cylinder and piston |
| B. | Piston rod and connecting rod |
| C. | Crankshaft and flywheel |
| D. | Flywheel and engine frame |
| Answer» D. Flywheel and engine frame | |
| 3806. |
A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by |
| A. | <img src="/_files/images/mechanical-engineering/theory-of-machines/499-309-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/theory-of-machines/499-309-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/theory-of-machines/499-309-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/theory-of-machines/499-309-4.png"> |
| Answer» C. <img src="/_files/images/mechanical-engineering/theory-of-machines/499-309-3.png"> | |
| 3807. |
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 | |
| 3808. |
The equation of motion for a vibrating system with viscous damping is If the roots of this equation are real, then the system will be |
| A. | overdamped |
| B. | under damped |
| C. | critically damped |
| D. | without vibrations |
| Answer» B. under damped | |
| 3809. |
Bifilar suspension method is used to find the |
| A. | angular acceleration of the body |
| B. | moment of inertia of the body |
| C. | periodic time of the body |
| D. | frequency of vibration of the body |
| Answer» C. periodic time of the body | |
| 3810. |
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 | |
| 3811. |
The motion of a shaft in a circular hole is an example of |
| A. | completely constrained motion |
| B. | incompletely constrained motion |
| C. | successfully constrained motion |
| D. | none of these |
| Answer» C. successfully constrained motion | |
| 3812. |
The equivalent length of a simple pendulum depends upon the distance between the point of suspension and the centre of gravity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3813. |
Balancing of rotating and reciprocating parts of an engine is necessary when it runs at |
| A. | slow speed |
| B. | moderate speed |
| C. | highs peed |
| D. | any one of these |
| Answer» D. any one of these | |
| 3814. |
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 | |
| 3815. |
In a locomotive, the resultant unbalanced force due to the two cylinders along the line of stroke, is known as |
| A. | tractive force |
| B. | swaying couple |
| C. | hammer blow |
| D. | none of these |
| Answer» B. swaying couple | |
| 3816. |
The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve) |
| A. | <img src="/_files/images/mechanical-engineering/theory-of-machines/501-333-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/theory-of-machines/501-333-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/theory-of-machines/501-333-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/theory-of-machines/501-333-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/theory-of-machines/501-333-4.png"> | |
| 3817. |
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 | |
| 3818. |
Which of the following is an example of sliding pair? |
| A. | Piston and cylinder of a reciprocating steam engine |
| B. | Shaft with collars at both ends fitted into a circular hole |
| C. | Lead screw of a lathe with nut |
| D. | Ball and a socket joint |
| Answer» B. Shaft with collars at both ends fitted into a circular hole | |
| 3819. |
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 | |
| 3820. |
The face of the tooth is the |
| A. | surface of the top of tooth |
| B. | surface of tooth above the pitch surface |
| C. | width of tooth below the pitch surface |
| D. | width of tooth measured along the pitch circle |
| Answer» C. width of tooth below the pitch surface | |
| 3821. |
A mechanism __________ for transmitting or transforming motion. |
| A. | can be used |
| B. | can not be used |
| Answer» B. can not be used | |
| 3822. |
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as |
| A. | damping factor |
| B. | damping coefficient |
| C. | logarithmic decrement |
| D. | magnification factor |
| Answer» E. | |
| 3823. |
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke ( ) is equal to |
| A. | 0 and 90 |
| B. | 90 and 180 |
| C. | 135 and 315 |
| D. | 270 and 360 |
| Answer» C. 135 and 315 | |
| 3824. |
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. | |
| 3825. |
The coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 3826. |
The magnitude of velocities of the points on a rigid link is |
| A. | directly proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre |
| B. | directly proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre |
| C. | inversely proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre |
| D. | inversely proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre |
| Answer» E. | |
| 3827. |
A pendulum type governor is a Watt governor. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 3828. |
The mechanism consisting of three turning pairs and one sliding pair, is called a |
| A. | single slider crank chain |
| B. | Whitworth quick return motion mechanism |
| C. | crank and slotted lever quick return motion mechanism |
| D. | all of the above |
| Answer» E. | |
| 3829. |
In a single slider crank chain |
| A. | each of the four pairs is a turning pair |
| B. | one is a turning pair and three are sliding pairs |
| C. | two are turning pairs and two are sliding pairs |
| D. | three are turning pairs and one is a sliding pair |
| Answer» E. | |
| 3830. |
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 | |
| 3831. |
The tangential component of acceleration of the slider with respect to the coincident point on the link is called coriolis component of acceleration. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 3832. |
A system in dynamic balance implies that |
| A. | the system is critically damped |
| B. | there is no critical speed in the system |
| C. | the system is also statically balanced |
| D. | there will absolutely no wear of bearings |
| Answer» D. there will absolutely no wear of bearings | |
| 3833. |
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. | |
| 3834. |
A shaft carrying three rotors will have |
| A. | no node |
| B. | one node |
| C. | two nodes |
| D. | three nodes |
| Answer» D. three nodes | |
| 3835. |
In involute gears, the pressure angle is |
| A. | dependent on the size of teeth |
| B. | dependent on the size of gears |
| C. | always constant |
| D. | always variable |
| Answer» D. always variable | |
| 3836. |
The uniform pressure theory gives a higher frictional torque than the uniform wear theory. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 3837. |
The centrifugal tension on the belt has no effect on the power transmitted. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 3838. |
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 | |
| 3839. |
The acceleration of piston in a reciprocating steam engine is given by (where = Angular velocity of crank, r = Radius of crank pin circle, = Angle turned by crank from inner dead centre, and n = Ratio of length of connecting rod to the radius of crank) |
| A. | <img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/theory-of-machines/495-281-4.png"> |
| Answer» E. | |
| 3840. |
Whitworth quick return motion mechanism is an inversion of a double slider crank chain. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 3841. |
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 | |
| 3842. |
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 |
| Answer» B. No | |
| 3843. |
The virtual or equivalent eccentric for the Meyer's expansion valve is defined as an eccentric having such a length and angle of advance that will cause cut-off to take place at the same position, as is caused by the combined effect of main eccentric and expansion eccentric. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 3844. |
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 | |
| 3845. |
A force acting in the opposite direction to the motion of the body is called force of friction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3846. |
A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is |
| A. | 5367 r.p.m. |
| B. | 6000 r.p.m. |
| C. | 9360 r.p.m. |
| D. | 12000 r.p.m. |
| Answer» B. 6000 r.p.m. | |
| 3847. |
In a steam engine, the link constitutes a |
| A. | piston, piston rod and crosshead |
| B. | connecting rod with big and small end brasses, caps and bolts |
| C. | crank pin, crankshaft and flywheel |
| D. | all of the above |
| Answer» E. | |
| 3848. |
The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is |
| A. | 0 and 90 |
| B. | 180 and 360 |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 3849. |
Which of the following is a turning pair? |
| A. | Piston and cylinder of a reciprocating steam engine |
| B. | Shaft with collars at both ends fitted into a circular hole |
| C. | Lead screw of a lathe with nut |
| D. | Ball and a socket joint |
| Answer» C. Lead screw of a lathe with nut | |
| 3850. |
In a simple train of wheels, the velocity ratio __________ the intermediate wheels. |
| A. | depends upon |
| B. | is independent of |
| Answer» C. | |