MCQOPTIONS
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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.
| 1. |
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is |
| A. | 5 mm |
| B. | lightly less than 95 mm |
| C. | lightly more than 95 mm |
| D. | 5 mm |
| Answer» C. lightly more than 95 mm | |
| 2. |
The relation l = (2/3).(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. | ne lower pair and two additional links |
| B. | wo lower pairs and one additional link |
| C. | wo lower pairs and two additional links |
| D. | ny one of these |
| Answer» C. wo lower pairs and two additional links | |
| 3. |
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will |
| A. | emain same as before |
| B. | ecome equal to 2R |
| C. | ecome equal to R/2 |
| D. | ecome equal to R/4 |
| Answer» B. ecome equal to 2R | |
| 4. |
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. | agnitude of the forces on journal |
| B. | ngular velocity of journal |
| C. | learance between journal and bearing |
| D. | adius of journal |
| Answer» E. | |
| 5. |
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing) |
| A. | wr |
| B. | μWR |
| C. | /₃ μWR |
| D. | μWR |
| Answer» E. | |
| 6. |
The velocity of sliding of meshing gear teeth is (Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point) |
| A. | ω₁ + ω₂) y |
| B. | ω₁/ω₂) y |
| C. | ω₁ × ω₂) y |
| D. | ω₁ + ω₂)/y |
| Answer» B. ω₁/ω₂) y | |
| 7. |
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is |
| A. | inematically sound |
| B. | ot sound |
| C. | oundness would depend upon which link is kept fixed |
| D. | ata is not sufficient to determine same |
| Answer» B. ot sound | |
| 8. |
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. | ause withdrawing or throttling of steam |
| B. | educe length of effective stroke of piston |
| C. | educe maximum opening of port to steam |
| D. | ll of these |
| Answer» D. ll of these | |
| 9. |
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will |
| A. | ause withdrawing or throttling of steam |
| B. | educe length of effective stroke of piston |
| C. | educe maximum opening of port to steam |
| D. | ll of these |
| Answer» C. educe maximum opening of port to steam | |
| 10. |
ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is |
| A. | 1/3). v |
| B. | 2/3). v |
| C. | 3/2). v |
| D. | 9/4). v |
| Answer» D. 9/4). v | |
| 11. |
The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear. |
| A. | ess |
| B. | ore |
| C. | ame |
| D. | one of these |
| Answer» C. ame | |
| 12. |
In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called |
| A. | ead |
| B. | team lap |
| C. | xhaust lap |
| D. | one of these |
| Answer» C. xhaust lap | |
| 13. |
A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force |
| A. | he reaction on me inner wheels increases and on the outer wheels decreases |
| B. | he reaction on the outer wheels increases and on the inner wheels decreases |
| C. | he reaction on the front wheels increases and on the rear wheels decreases |
| D. | he reaction on the rear wheels increases and on the front wheels decreases |
| Answer» C. he reaction on the front wheels increases and on the rear wheels decreases | |
| 14. |
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. | ,367 r.p.m. |
| B. | ,000 r.p.m. |
| C. | ,360 r.p.m. |
| D. | 2,000 r.p.m. |
| Answer» B. ,000 r.p.m. | |
| 15. |
In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed |
| A. | artung governor |
| B. | ilson Hartnell governor |
| C. | ickering governor |
| D. | nertia governor |
| Answer» D. nertia governor | |
| 16. |
An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one end is pivoted and other end is connected to it. This mechanism has |
| A. | links |
| B. | links |
| C. | links |
| D. | links |
| Answer» D. links | |
| 17. |
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done |
| A. | ecause of difficulty in manufacturing cam profile |
| B. | ecause of loose contact of follower with cam surface |
| C. | n order to have acceleration in beginning and retardation at the end of stroke within the finite limits |
| D. | ecause the uniform velocity motion is a partial parabolic motion |
| Answer» D. ecause the uniform velocity motion is a partial parabolic motion | |
| 18. |
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as |
| A. | amping factor |
| B. | amping coefficient |
| C. | ogarithmic decrement |
| D. | agnification factor |
| Answer» E. | |
| 19. |
In a locomotive, the resultant unbalanced force due to the two cylinders along the line of stroke, is known as |
| A. | ractive force |
| B. | waying couple |
| C. | ammer blow |
| D. | one of these |
| Answer» B. waying couple | |
| 20. |
A machine mounted on a single coil spring has a period of free vibration of tp . 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. | p /16 |
| B. | p /4 |
| C. | tp |
| D. | 6 tp |
| Answer» C. tp | |
| 21. |
In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called |
| A. | luctuation of energy |
| B. | aximum fluctuation of energy |
| C. | oefficient of fluctuation of energy |
| D. | one of these |
| Answer» B. aximum fluctuation of energy | |
| 22. |
Which of the following is a pendulum type governor? |
| A. | att governor |
| B. | orter governor |
| C. | artnell governor |
| D. | one of these |
| Answer» B. orter governor | |
| 23. |
According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on |
| A. | triangle |
| B. | point |
| C. | wo lines |
| D. | straight line |
| Answer» E. | |
| 24. |
A pantograph is a mechanism with |
| A. | Lower pairs |
| B. | Higher pairs |
| C. | Rolling pairs |
| D. | Turning pairs |
| Answer» B. Higher pairs | |
| 25. |
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 | |
| 26. |
In a coupling rod of a locomotive, each of the four pairs is a ________ pair. |
| A. | Sliding |
| B. | Turning |
| C. | Rolling |
| D. | Screw |
| Answer» C. Rolling | |
| 27. |
In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by |
| A. | μ₁ = μ sin β |
| B. | μ₁ = μ cos β |
| C. | μ₁ = μ/sin β |
| D. | μ₁ = μ/cos β |
| Answer» E. | |
| 28. |
A circular bar moving in a round hole is an example of |
| A. | Incompletely constrained motion |
| B. | Partially constrained motion |
| C. | Completely constrained motion |
| D. | Successfully constrained motion |
| Answer» B. Partially constrained motion | |
| 29. |
The D-slide valve is also known as |
| A. | Inside admission valve |
| B. | Outside admission valve |
| C. | Piston slide valve |
| D. | None of these |
| Answer» C. Piston slide valve | |
| 30. |
Which of the following is a lower pair? |
| A. | Ball and socket i |
| B. | Piston and cylinder |
| C. | Cam and follower |
| D. | Both (A) and (B) above |
| Answer» E. | |
| 31. |
Critical damping is a function of |
| A. | Mass and stiffness |
| B. | Mass and damping coefficient |
| C. | Mass and natural frequency |
| D. | Damping coefficient and natural frequency |
| Answer» B. Mass and damping coefficient | |
| 32. |
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 | |
| 33. |
Oldham’s coupling is an inversion of the kinematic chain used in |
| A. | Whitworth quick return mechanism |
| B. | Elliptical trammels |
| C. | Rotary engine |
| D. | Universal joint |
| Answer» C. Rotary engine | |
| 34. |
The height of a Watt's governor (in meters) is equal to (where N = Speed of the arm and ball about the spindle axis) |
| A. | 8.95/N² |
| B. | 89.5/N² |
| C. | 895/N² |
| D. | 8950/N² |
| Answer» D. 8950/N² | |
| 35. |
A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin) |
| A. | (1/2).Iω² |
| B. | Iω² |
| C. | (1/2). I ω ωP |
| D. | I ω ωP |
| Answer» E. | |
| 36. |
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration. |
| A. | Smaller |
| B. | Larger |
| C. | Either A or B |
| D. | None of these |
| Answer» B. Larger | |
| 37. |
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship. |
| A. | Vertically and parallel |
| B. | Vertically and perpendicular |
| C. | Horizontally and parallel |
| D. | Horizontally and perpendicular |
| Answer» E. | |
| 38. |
The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and δ = Static deflection of the body) |
| A. | 1/2π × √(s/m) |
| B. | 1/2π × √(g/δ) |
| C. | 0.4985/√δ |
| D. | Any one of these |
| Answer» E. | |
| 39. |
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body) |
| A. | l₁ = kG |
| B. | l₂ = kG |
| C. | l₁l₂ = kG |
| D. | l₁l₂ = kG² |
| Answer» E. | |
| 40. |
Tangential acceleration direction is |
| A. | Along the angular velocity |
| B. | Opposite to angular velocity |
| C. | May be any one of these |
| D. | Perpendicular to angular velocity |
| Answer» D. Perpendicular to angular velocity | |
| 41. |
Which of the following is a spring controlled governor? |
| A. | Hartnell governor |
| B. | Hartung governor |
| C. | Wilson-Hartnell governor |
| D. | All of these |
| Answer» E. | |
| 42. |
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. | |
| 43. |
A completely constrained motion can be transmitted with. |
| A. | 1 link with pin joints |
| B. | 2 links with pin joints |
| C. | 3 links with pin joints |
| D. | 4 links with pin joints |
| Answer» E. | |
| 44. |
Kinematic pairs are those which have two elements that |
| A. | Have line contact |
| B. | Have surface contact |
| C. | Permit relative motion |
| D. | Are held together |
| Answer» D. Are held together | |
| 45. |
In under damped vibrating system, the amplitude of vibration |
| A. | Decreases linearly with time |
| B. | Increases linearly with time |
| C. | Decreases exponentially with time |
| D. | Increases exponentially with time |
| Answer» D. Increases exponentially with time | |
| 46. |
The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is |
| A. | Equal to 1 |
| B. | Less than 2 |
| C. | Equal to 2 |
| D. | Greater than 2 |
| Answer» E. | |
| 47. |
The secondary unbalanced force is __________ the primary unbalanced force. |
| A. | One-half |
| B. | Two-third |
| C. | n times |
| D. | 1/n times |
| Answer» E. | |
| 48. |
The Bifilar suspension method is used to determine |
| A. | Natural frequency of vibration |
| B. | Position of balancing weights |
| C. | Moment of inertia |
| D. | Centripetal acceleration |
| Answer» D. Centripetal acceleration | |
| 49. |
The amplitude of vibration is always __________ the radius of the circle. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» B. Less than | |
| 50. |
The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is |
| A. | 3 Hz |
| B. | 3π Hz |
| C. | 6 Hz |
| D. | 6π Hz |
| Answer» B. 3π Hz | |