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.
| 901. |
In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is$ |
| A. | Equal to 1 |
| B. | Equal to 2 |
| C. | Less than 2 |
| D. | Greater than 2 |
| Answer» C. Less than 2 | |
| 902. |
A pulley and belt in a belt drive form a |
| A. | Cylindrical pair |
| B. | Turning pair |
| C. | Rolling pair |
| D. | Sliding pair |
| Answer» C. Rolling pair | |
| 903. |
The height of a Watt's governor is |
| A. | Directly proportional to speed |
| B. | Directly proportional to (speed)² |
| C. | Inversely proportional to speed |
| D. | Inversely proportional to (speed)² |
| Answer» E. | |
| 904. |
In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as |
| A. | Critical damping ratio |
| B. | Damping factor |
| C. | Logarithmic decrement |
| D. | Magnification factor |
| Answer» E. | |
| 905. |
If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be |
| A. | Less |
| B. | More |
| C. | Same |
| D. | Data are insufficient to determine same |
| Answer» B. More | |
| 906. |
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 | |
| 907. |
The Scott-Russell mechanism consists of |
| A. | Sliding and turning pairs |
| B. | Sliding and rotary pairs |
| C. | Turning and rotary pairs |
| D. | Sliding pairs only |
| Answer» B. Sliding and rotary pairs | |
| 908. |
A universal joint is an example of |
| A. | Higher pair |
| B. | Lower pair |
| C. | Rolling pair |
| D. | Sliding pair |
| Answer» C. Rolling pair | |
| 909. |
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 | |
| 910. |
A disturbing mass m‚ÇÅ attached to the rotating shaft may be balanced by a single mass m‚ÇÇ attached in the same plane of rotation as that of m‚ÇÅ, such that (where r‚ÇÅ and r‚ÇÇ are the radii of rotation of m‚ÇÅ and m‚ÇÇ respectively)$ |
| A. | m‚ÇÅ r‚ÇÇ = m‚ÇÇ r‚ÇÅ |
| B. | m‚ÇÅ r‚ÇÅ = m‚ÇÇ r‚ÇÇ |
| C. | m‚ÇÅ m‚ÇÇ = r‚ÇÅ r‚ÇÇ |
| D. | None of these |
| Answer» C. m‚Äö√á√Ö m‚Äö√á√á = r‚Äö√á√Ö r‚Äö√á√á | |
| 911. |
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)$ |
| A. | ω₁.ω₂.r |
| B. | (ω₁ - ω₂) r |
| C. | (ω₁ + ω₂) r |
| D. | (ω₁ - ω₂) 2r |
| Answer» D. (≈ì√¢‚Äö√á√Ö - ≈ì√¢‚Äö√á√á) 2r | |
| 912. |
A ball and a socket forms a |
| A. | Turning pair |
| B. | Rolling pair |
| C. | Screw pair |
| D. | Spherical pair |
| Answer» E. | |
| 913. |
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 | |
| 914. |
Klein's construction can be used when |
| A. | Crank has a uniform angular velocity |
| B. | Crank has non-uniform velocity |
| C. | Crank has uniform angular acceleration |
| D. | Crank has uniform angular velocity and angular acceleration |
| Answer» B. Crank has non-uniform velocity | |
| 915. |
A foot step bearing and rotor of a vertical turbine form examples of |
| A. | Incompletely constrained motion |
| B. | Partially constrained motion |
| C. | Completely constrained motion |
| D. | Successfully constrained motion |
| Answer» C. Completely constrained motion | |
| 916. |
In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon |
| A. | Total lift, total angle of lift, minimum radius of cam and cam speed |
| B. | Radius of circular arc, cam speed, location of centre of circular arc and roller diameter |
| C. | Mass of cam follower linkage, spring stiffness and cam speed |
| D. | Total lift, centre of gravity of the cam and cam speed |
| Answer» B. Radius of circular arc, cam speed, location of centre of circular arc and roller diameter | |
| 917. |
The axis of precession is __________ to the plane in which the axis of spin is going to rotate. |
| A. | Parallel |
| B. | Perpendicular |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 918. |
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 | |
| 919. |
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 | |
| 920. |
The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is |
| A. | l = 2p - 2 |
| B. | l = 2p - 3 |
| C. | l = 2p - 4 |
| D. | l = 2p - 5 |
| Answer» D. l = 2p - 5 | |
| 921. |
The number of centers in a crank driven slider crank mechanism is |
| A. | 0 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 922. |
The swaying couple is due to the |
| A. | Primary unbalanced force |
| B. | Secondary unbalanced force |
| C. | Two cylinders of locomotive |
| D. | Partial balancing |
| Answer» B. Secondary unbalanced force | |
| 923. |
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. | m/(m + M) |
| B. | M/(m + M) |
| C. | (m + M)/m |
| D. | (m + M)/M |
| Answer» D. (m + M)/M | |
| 924. |
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will |
| A. | Return to equilibrium position without oscillation |
| B. | Oscillate with increasing time period |
| C. | Oscillate with decreasing amplitude |
| D. | Oscillate with constant amplitude |
| Answer» C. Oscillate with decreasing amplitude | |
| 925. |
The example of spherical pair is |
| A. | Bolt and nut |
| B. | Lead screw of a lathe |
| C. | Ball and socket joint |
| D. | Ball bearing and roller bearing |
| Answer» D. Ball bearing and roller bearing | |
| 926. |
The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)# |
| A. | sinα = b/c |
| B. | cosα = c/b |
| C. | tanα = c/2b |
| D. | cotα = c/2b |
| Answer» D. cot≈í¬± = c/2b | |
| 927. |
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 | |
| 928. |
Lower pairs are those which have |
| A. | Point or line contact between the two elements when in motion |
| B. | Surface contact between the two elements when in motion |
| C. | Elements of pairs not held together mechanically |
| D. | Two elements that permit relative motion |
| Answer» C. Elements of pairs not held together mechanically | |
| 929. |
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to# |
| A. | Vector sum of radial component and Coriolis component |
| B. | Vector sum of tangential component and Coriolis component |
| C. | Vector sum of radial component and tangential component |
| D. | Vector difference of radial component and tangential component |
| Answer» D. Vector difference of radial component and tangential component | |
| 930. |
In a spring controlled governor, when the controlling force ________ as the radius of rotation increases, it is said to be a stable governor. |
| A. | Remains constant |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» D. None of these | |
| 931. |
If ω/ωn 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¬¨‚àû | |
| 932. |
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is |
| A. | Maximum and zero |
| B. | Zero and maximum |
| C. | Minimum and maximum |
| D. | Zero and minimum |
| Answer» B. Zero and maximum | |
| 933. |
When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable. |
| A. | Remains constant |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» C. Increases | |
| 934. |
Whitworth quick return mechanism is obtained by inversion of |
| A. | Slider crank mechanism |
| B. | Kinematic chain |
| C. | Five link mechanism |
| D. | Roller cam mechanism |
| Answer» B. Kinematic chain | |
| 935. |
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 minimum length of the coupler will be |
| A. | 45 mm |
| B. | Slightly less than 45 mm |
| C. | Slightly more than 45 mm |
| D. | 95 mm |
| Answer» D. 95 mm | |
| 936. |
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¬¨‚àû and 270¬¨‚àû | |
| 937. |
The purpose of a link is to |
| A. | Transmit motion |
| B. | Guide other links |
| C. | Act as a support |
| D. | All of the above |
| Answer» E. | |
| 938. |
The Ackermann steering mechanism is preferred to the Davis type in automobiles because |
| A. | The former is mathematically accurate |
| B. | The former is having turning pair |
| C. | The former is most economical |
| D. | The former is most rigid |
| Answer» C. The former is most economical | |
| 939. |
It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by |
| A. | Universal joint |
| B. | Knuckle joint |
| C. | Oldham's coupling |
| D. | Flexible coupling |
| Answer» D. Flexible coupling | |
| 940. |
With usual notations for different parameters involved, the maximum fluctuations of energy for a flywheel is given by |
| A. | 2ECS |
| B. | EC S/2 |
| C. | 2ECS² |
| D. | 2E²CS |
| Answer» B. EC S/2 | |
| 941. |
Under logarithmic decrement, the amplitude of successive vibrations are |
| A. | Constant |
| B. | In arithmetic progression |
| C. | In geometric progression |
| D. | In logarithmic progression |
| Answer» D. In logarithmic progression | |
| 942. |
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. 3≈ì√Ñ Hz | |
| 943. |
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. | |
| 944. |
The advantage of the piston valve over the slide valve is that in the former case |
| A. | Wear is less |
| B. | Power absorbed is less |
| C. | Both wear and power absorbed are low |
| D. | The pressure developed being high provides tight sealing |
| Answer» D. The pressure developed being high provides tight sealing | |
| 945. |
A body will begin to move down an inclined plane, if the angle of inclination of the plane is ________ the angle of friction. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» D. None of these | |
| 946. |
When the body is suspended at the point of suspension, its periodic time and frequency will be ________ as compared to the body suspended at the point of percussion. |
| A. | Same |
| B. | Two times |
| C. | Four times |
| D. | None of these |
| Answer» B. Two times | |
| 947. |
In a screw jack, the effort required to lower the load W is given by |
| A. | P = W tan(α - φ) |
| B. | P = W tan(α + φ) |
| C. | P = W tan(φ - α) |
| D. | P = W cos(α + φ) |
| Answer» D. P = W cos(≈í¬± + ≈ì√ú) | |
| 948. |
One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)# |
| A. | 2œÄ. ‚à ö(g/Œ¥) |
| B. | 1/2œÄ. ‚à ö(g/Œ¥) |
| C. | 2œÄ. ‚à ö(Œ¥/g) |
| D. | 1/2œÄ. ‚à ö(Œ¥/g) |
| Answer» C. 2≈ì√Ñ. ‚Äö√ √∂(≈í¬•/g) | |
| 949. |
The partial balancing of reciprocating parts in locomotives produces |
| A. | Hammer blow |
| B. | Swaying couple |
| C. | Variation in tractive force along the line of stroke |
| D. | All of the above |
| Answer» E. | |
| 950. |
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is |
| A. | 1.4 N-s/m |
| B. | 18.52 N-s/m |
| C. | 52.92 N-s/m |
| D. | 529.2 N-s/m |
| Answer» D. 529.2 N-s/m | |