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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.
| 3851. |
The two elements of a pair are said to form a higher pair, when they |
| A. | have a surface contact when in motion |
| B. | have a line or point contact when in motion |
| C. | are kept in contact by the action of external forces, when in motion |
| D. | permit relative motion |
| Answer» C. are kept in contact by the action of external forces, when in motion | |
| 3852. |
When two pulleys are connected by means of an open belt drive, then both the pulleys will rotate is opposite directions. |
| A. | Right |
| B. | Wrong |
| Answer» C. | |
| 3853. |
A mechanism consisting of four links is called a __________ mechanism. |
| A. | simple |
| B. | compound |
| Answer» B. compound | |
| 3854. |
Scott Russell's mechanism is made up of sliding pair. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 3855. |
Which of the following is an example of a higher pair ? |
| A. | Toothed gearing |
| B. | Belt and rope drive |
| C. | Ball and roller bearing |
| D. | all of these |
| Answer» E. | |
| 3856. |
For dynamic balancing of a shaft |
| A. | the net dynamic force acting on the shaft is equal to zero |
| B. | the net couple due to the dynamic forces acting on the shaft is equal to zero |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» D. none of the above | |
| 3857. |
In a kinematic chain, a quaternary joint is equivalent to |
| A. | one binary joint |
| B. | two binary joints |
| C. | three binary joints |
| D. | four binary joints |
| Answer» D. four binary joints | |
| 3858. |
The maximum fluctuation of energy is the |
| A. | difference between the maximum and minimum energies |
| B. | sum of the maximum and minimum energies |
| C. | variations of energy above and below the mean resisting torque line |
| D. | ratio of the mean resisting torque to the workdone per cycle |
| Answer» B. sum of the maximum and minimum energies | |
| 3859. |
The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as |
| A. | structure |
| B. | machine |
| C. | inversion |
| D. | compound mechanism |
| Answer» D. compound mechanism | |
| 3860. |
The amplitude of vibration is always __________ the radius of the circle. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» B. less than | |
| 3861. |
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the |
| A. | tip of the gear tooth and flank of pinion |
| B. | tip of the pinion and flank of gear |
| C. | flanks of both gear and pinion |
| D. | tip of both gear and pinion |
| Answer» B. tip of the pinion and flank of gear | |
| 3862. |
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 | |
| 3863. |
When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move the ship towards port side. |
| A. | upward |
| B. | downward |
| Answer» C. | |
| 3864. |
A kinematic chain is known as a mechanism when |
| A. | none of the links is fixed |
| B. | one of the links is fixed |
| C. | two of the links are fixed |
| D. | none of these |
| Answer» C. two of the links are fixed | |
| 3865. |
There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is |
| A. | 1/24 |
| B. | 1/8 |
| C. | 4/15 |
| D. | 12 |
| Answer» B. 1/8 | |
| 3866. |
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 = Pressure angle) |
| A. | <img src="/_files/images/mechanical-engineering/theory-of-machines/493-254-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/theory-of-machines/493-254-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/theory-of-machines/493-254-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/theory-of-machines/493-254-4.png"> |
| Answer» E. | |
| 3867. |
The periodic time of one oscillation for a simple pendulum is |
| A. | <img src="/_files/images/mechanical-engineering/theory-of-machines/477-88-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/theory-of-machines/477-88-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/theory-of-machines/477-88-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/theory-of-machines/477-88-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/theory-of-machines/477-88-4.png"> | |
| 3868. |
The direction of linear velocity of any point on a link with respect to another point on the same link is |
| A. | parallel to the link joining the points |
| B. | perpendicular to the link joining the points |
| C. | at 45 to the link joining the points |
| D. | none of the above |
| Answer» C. at 45 to the link joining the points | |
| 3869. |
In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T1 acts at A and smaller tension T2 at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should |
| A. | be zero |
| B. | act in upward direction |
| C. | act in downward direction |
| D. | none of the above |
| Answer» D. none of the above | |
| 3870. |
When the primary direct crank of a reciprocating engine makes an angle of with the line of stroke, then the secondary direct crank will make an angle of __________ with the line of stroke. |
| A. | /2 |
| B. | |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 3871. |
The frequency of oscillation of a compound pendulum is |
| A. | <img src="/_files/images/mechanical-engineering/theory-of-machines/477-91-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/theory-of-machines/477-91-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/theory-of-machines/477-91-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/theory-of-machines/477-91-4.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/theory-of-machines/477-91-4.png"> | |
| 3872. |
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 | |
| 3873. |
According to law of gearing, the common normal at the point of contact between a pair of teeth must always pass through the pitch point. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 3874. |
The motion between a pair which takes place in __________ is known as incompletely constrained motion. |
| A. | one direction only |
| B. | more than one direction |
| Answer» C. | |
| 3875. |
The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity. |
| A. | zero |
| B. | minimum |
| C. | maximum |
| Answer» C. maximum | |
| 3876. |
When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be |
| A. | to move the ship towards star-board |
| B. | to move the ship towards port side |
| C. | to raise the bow and lower the stern |
| D. | to raise the stern and lower the bow |
| Answer» B. to move the ship towards port side | |
| 3877. |
The unbalanced force due to reciprocating masses |
| A. | varies in magnitude but constant in direction |
| B. | varies in direction but constant in magnitude |
| C. | varies in magnitude and direction both |
| D. | constant in magnitude and direction both |
| Answer» B. varies in direction but constant in magnitude | |
| 3878. |
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 | |
| 3879. |
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in |
| A. | transverse vibrations |
| B. | torsional vibrations |
| C. | longitudinal vibrations |
| D. | all of these |
| Answer» B. torsional vibrations | |
| 3880. |
The centre of gravity of a coupler link in a four bar mechanism will experience |
| A. | no acceleration |
| B. | only linear acceleration |
| C. | only angular acceleration |
| D. | both linear and angular acceleration |
| Answer» E. | |
| 3881. |
The equation of free vibrations of a system is , Its natural frequency is |
| A. | 3 Hz |
| B. | 3 Hz |
| C. | 6 Hz |
| D. | 6 Hz |
| Answer» B. 3 Hz | |
| 3882. |
In a simple train of wheels, if the number of intermediate wheels is odd, the motion of the follower will be same as that of the driver. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 3883. |
Which of the following is a pendulum type governor? |
| A. | Watt governor |
| B. | Porter governor |
| C. | Hartnell governor |
| D. | none of these |
| Answer» B. Porter governor | |
| 3884. |
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 | |
| 3885. |
In vibration isolation system, if / n > 1, then the phase difference between the transmitted force and the disturbing force is |
| A. | 0 |
| B. | 90 |
| C. | 180 |
| D. | 270 |
| Answer» D. 270 | |
| 3886. |
The piston slide valve is an inside admission valve. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 3887. |
The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration. |
| A. | same |
| B. | different |
| Answer» B. different | |
| 3888. |
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. | |
| 3889. |
Which of the following is an inversion of a single slider crank chain? |
| A. | Pendulum pump |
| B. | Oscillating cylinder engine |
| C. | Rotary internal combustion engine |
| D. | all of these |
| Answer» E. | |
| 3890. |
A very sensitive governor will cause hunting. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3891. |
The flank of the tooth is the surface of the tooth __________ the pitch surface. |
| A. | above |
| B. | below |
| Answer» C. | |
| 3892. |
The inertia force is equal to the accelerating force in magnitude, but opposite in direction. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 3893. |
A railway bridge is an example of a machine. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3894. |
The product of the diametral pitch and circular pitch is equal to |
| A. | 1 |
| B. | 1/ |
| C. | |
| D. | 2 |
| Answer» D. 2 | |
| 3895. |
The coriolis component of acceleration is taken into account for |
| A. | slider crank mechanism |
| B. | four bar chain mechanism |
| C. | quick return motion mechanism |
| D. | all of these |
| Answer» D. all of these | |
| 3896. |
The cam follower generally used in air-craft engines is |
| A. | knife edge follower |
| B. | flat faced follower |
| C. | spherical faced follower |
| D. | roller follower |
| Answer» E. | |
| 3897. |
In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as |
| A. | tractive force |
| B. | swaying couple |
| C. | hammer blow |
| D. | none of these |
| Answer» D. none of these | |
| 3898. |
For low and moderate speed engines, the cam follower should move with |
| A. | uniform velocity |
| B. | simple harmonic motion |
| C. | uniform acceleration and retardation |
| D. | cycloidal motion |
| Answer» C. uniform acceleration and retardation | |
| 3899. |
If / n is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach |
| A. | 0 |
| B. | 90 |
| C. | 180 |
| D. | 360 |
| Answer» B. 90 | |
| 3900. |
The periodic time is given by (where = Angular velocity of the particle in rad/s) |
| A. | /2 |
| B. | 2 / |
| C. | x 2 |
| D. | / |
| Answer» C. x 2 | |