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engineering
machine elements in mechanical design

Questions and Answers of Machine Elements In Mechanical Design

During torsional vibration of a shaft, the node is characterized by the(a) maximum angular velocity(b) maximum angular displacement(c) maximum angular acceleration(d) zero angular displacement.
In a slider-crank mechanism, the maximum acceleration of slider is obtained when the crank is(a) at the inner dead centre position(b) at the outer dead centre position(c) exactly midway position
Consider the following statements for completely balancing a single rotating mass:1). Another rotating mass placed diametrically opposite in the same plane balances the unbalanced mass.2). Another
Consider the following statements in case of reverted gear train:1). The direction of rotation of the first and the last gear is the same 2). The direction of rotation of the first and the last gear
The instantaneous centre of rotation of a rigid thin disc rolling without slip on a plane rigid surface is located at(a) the centre of the disc(b) an infinite distance perpendicular to the plane
Match List I (Kinematic pairs) with List II (Practical example) and select the correct answer using the codes given below the lists: List I (Kinematic pairs) A. Sliding pair B. Revolute pair C.
The choice of displacement diagram during rise or return of a follower of a cam-follower mechanism is based on dynamic considerations. For high speed cam follower mechanism, the most suitable
A linkage is shown below in the Fig. 47 in which links \(A B C\) and \(D E F\) are ternary links whereas \(A F, B E\) and \(C D\) binary links.The degrees of freedom of the linkage when link \(A B
Match List I (Mechanism) with List II (Motion) and select the correct answer using the codes given below the lists: List I (Mechanism) A. Hart mechanism B. Pantograph C. Whitworth mechanism D. Scotch
Match List (Connecting shafts) with List II (Couplings) and select the correct answer using the codes given below the lists: List I (Connecting shaft) A. In perfect alignment B. With angular
The crank and slotted lever quick-return motion mechanism is shown in Fig.48. The length of links \(O_{1} O_{2}, O_{1} C\) and \(O_{2} A\) are \(10 \mathrm{~cm}, 20 \mathrm{~cm}\) and \(5
If the rotating mass of a rim type flywheel is distributed on another rim type fly wheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed
The nature of the governors is shown by the graph between radius (r) of rotation and controlling force \((\mathrm{F})\). Which of the following is an isochronous governor? (a) F (b) F (c) F r Fig.49
The radius of the friction circle in a journal bearing is dependent on coefficient of friction and the(a) angular velocity of the journal(b) radius of the journal(c) magnitudes of the forces on the
In a collar thrust bearing, the number of collars have been doubled while maintaining coefficient of friction and axial thrust same. It will result in(a) same friction torque and same bearing
In a Hartnell governor, the mass of each ball is \(2.5 \mathrm{~kg}\). Maximum and minimum speeds of rotation are \(10 \mathrm{rad} / \mathrm{s}\) and \(8 \mathrm{rad} / \mathrm{s}\) respectively.
A rod of uniform diameter is suspended from one of its ends in vertical plane. The mass of the rod is ' \(m\) ' and length ' \(l\) ', the natural frequency of this rod in \(\mathrm{Hz}\) for small
The mass moment of inertia of the two rotors in a two rotor system are \(100 \mathrm{~kg} \cdot \mathrm{m}^{2}\) and \(10 \mathrm{~kg} \cdot \mathrm{m}^{2}\). The length of the shaft of uniform
A shaft of \(50 \mathrm{~mm}\) diameter and \(1 \mathrm{~m}\) length carries a disc which has mass eccentricity equal to 190 microns. The displacement of the shaft at a speed which is \(90 \%\) of
Fig. 50 shows a rigid body of mass \(m\) having radius of gyration \(k\) about its centre of gravity. It is to be replaced by an equivalent dynamical system of two masses placed at \(A\) and \(B\).
\(f=3(n-1)-2 j\). In the Grubler's equation for planar mechanisms given, \(j\) is the(a) Number of mobile links(b) Number of links(c) Number of lower pairs(d) Length of the longest link.
Which of the following are examples of forced closed kinematic pairs?1). Cam and roller mechanism 2). Door closing mechanism 3). Slider-crank mechanism 4). Automotive clutch operating mechanism
Which of the mechanisms shown in Fig. 51 do/does not have single degree of freedom?(a) 3 and 4(b) 2 and 3(c) 3 only(d) 4 only. (1) (2) (3) (4) Fig.51
Two points, \(A\) and \(B\) located along the radius of a wheel, as shown in the Fig.52, have velocities of 80 and \(140 \mathrm{~m} / \mathrm{s}\), respectively. The distance between points \(A\)
In a slider-crank mechanism, the velocity of piston becomes maximum when(a) Crank and connecting rod are in line with each other(b) Crank is perpendicular to the line of stroke of the piston(c) Crank
Three positions of the quick-return mechanism are shown in Fig.53. In which of the cases does the Coriolis component of acceleration exist?Select the correct answer using the codes given
The below Fig. 54 shows a circular disc of \(1 \mathrm{~kg}\) mass and \(0.2 \mathrm{~m}\) radius undergoing unconstrained planar motion under the action of two forces as shown. The magnitude of
For a slider-crank mechanism with radius of crank \(\mathrm{r}\), length of connecting rod \(l\), obliquity ratio \(n\), crank rotating at an angular velocity \(\omega\); for any angle \(\theta\) of
Fig. 55 shows Klien's construction for slider-crank mechanism \(O C P\) drawn to full scale. What velocity does \(C D\) represent?(a) Velocity of the crank pin(b) Velocity of the piston(c) Velocity
The maximum fluctuation of energy \(\mathrm{E}_{p}\), during a cycle for a flywheel is(a) \(I\left(\omega_{\max }^{2}-\omega_{\min }^{2}\right)\)(b) \(\frac{1}{2} \cdot I \cdot \omega_{a v}
For minimizing speed fluctuations of an engine as a prime mover, it must have(a) Only a flywheel fitted to the crankshaft(b) A governor provided in the system(c) Both a flywheel and a governor
Effect of friction, at the sleeve of a centrifugal governor is to make it(a) More sensitive(b) More stable(c) Insensitive over a small range of speed(d) Unstable.
A circular disc having a mass of \(30 \mathrm{~kg}\) is moved asymmetrically between two bearings \(A\) and \(B\) as shown in the Fig.56. It is used as an eccentric cam with an eccentricity of \(0.01
The below Fig. 57 shows the schematic diagram of an IC engine producing a torque \(T=41 \mathrm{Nm}\) at the given instant. The Coulomb friction coefficient between the cylinder and the piston is
Consider the following, modifications regarding avoiding the interference between gears:1). The centre distance between meshing gears be increased 2). Addendum of the gear be modified 3). Teeth
In a reverted gear train, two gears \(P\) and \(Q\) are meshing, \(Q-R\) is a compound gear, and \(R\) and \(S\) are meshing. The modules of \(P\) and \(R\) are \(4 \mathrm{~mm}\) and \(5
When two spur gears having involute profiles on their teeth engage, the line of action is tangential to the(a) Pitch circles(b) Dedendum circles(c) Addendum circles(d) Base circles.
If the annular wheel of an epicyclic gear train has 100 teeth and the planet wheel has 20 teeth, the number of teeth on the sun wheel is(a) 80(b) 60(c) 40(d) 20 .
The double slider-crank chain is shown below in the Fig. 58 in its three possible inversions. The link shown hatched is the fixed link:Which one of the following statements is correct?(a) Inversion
\(A B C D\) is a four bar mechanism, in which \(A D\) is the fixed link, and link \(B C\), is in the form of a circular disc with centre \(P\). In which one of the following cases \(P\) will be the
In the Fig. 60 given below, the magnitude of absolute angular velocity of link 2 is 10 radians per second while that of link 3 is 6 radians per second. What is the angular velocity of link 3 relative
\(A B C D\) is a mechanism with link lengths \(A B=200, B C=300, C D=400\) and \(D A=350\). Which one of the following links should be fixed for the resulting mechanism to be a double crank
The crank of the mechanism shown below in the Fig. 61 rotates at a uniform angular velocity \(\omega\).Which one of the following diagrams shows the velocity of slider \(x\) with respect to the crank
In the plate cam mechanism with reciprocating roller follower, in which one of the following cases the follower has constant acceleration?(a) Cycloidal motion(b) Simple harmonic motion(c) Parabolic
Which one of the following statements is correct?In a petrol engine mechanism the velocity of the piston is maximum when the crank is(a) at the dead centres(b) at right angles to the line of
In a differential mechanism, two equal sized bevel wheels \(A\) and \(B\) are keyed to the two halves of the rear axle of a motor car. The car follows a curved path. Which one of the following
Which one of the following conversions is used by a lawn-sprinkler which is a four bar mechanisms?(a) Reciprocating motion to rotary motion(b) Reciprocating motion to oscillatory motion(c) Rotary
In the mechanism shown below in Fig.62, link 3 has(a) curvilinear translation and all points in it trace out identical cycloids(b) curvilinear translation and all points in it trace out identical
Consider the following methods:(1) Trifilar suspension(2) Torsional oscillation(3) Fluctuation of energy of engine(4) Weight measurement and measurement of radius of flywheel Which of the above
A connecting rod has a mass of \(0.5 \mathrm{~kg}\). The radius of gyration through its centre of gravity is \(5 \mathrm{~cm}\) and its acceleration is \(2 \times 10^{4} \mathrm{rad} /
Which one of the following statements is correct?A governor will be stable if the radius of rotation of the balls(a) increases as the equilibrium speed decreases(b) decreases as the equilibrium speed
Which one of the following statements in the context of balancing in engines is correct?(a) Magnitude of the primary unbalancing force is less than the secondary unbalancing force(b) The primary
A four-cylinder in-line reciprocating engine is shown in the Fig. 63 given below. The cylinders are numbered 1 to 4 and the firing order is 1-4-2-3:Which one of the following statements is
Match List I with List II and select the correct answer using the codes given below the lists: List I A. Open loop system B. Closed loop system C. Step input D. Sinusoidal input Codes: List II 1.
An epicyclic gear train has 3 shafts \(A, B\) and \(C . A\) is an input shaft running at \(100 \mathrm{rpm}\) clockwise. \(B\) is an output shaft running at \(250 \mathrm{rpm}\) clockwise. Torque on
Which of the following is a closed-loop control system?(a) Traffic control on the roads by lights where the timing mechanism is present irrespective of the intensity of traffic(b) Switching off the
The power transmitted by a belt is dependent on the centrifugal effect in the belt. The maximum power can be transmitted when the centrifugal tension is(a) \(\frac{1}{3}\) of tension
The length of the belt in the case of a cross-belt drive is given in terms of centre distance between pulleys \((C)\), diameters of the pulleys \(D\) and \(\mathrm{d}\) as(a) \(2
Which one of the following is the correct value of the natural frequency \(\left(\omega_{n}\right)\) of the system given above? (a) k www K3 15 www www 3 m 1 1/2 k + k + m (b) 3k Fig.64 (c) k m 3m
Consider the following statements:1). Coriolis acceleration component in a slotted bar mechanism is always perpendicular to the direction of the slotted bar 2). In a 4-link mechanism, the
Consider the following statements concerning centrifugal governors:1). The slope of the controlling force curve should be less than that of the straight line representing the centripetal force at the
Consider the following statements for a 4-cylinder in-line engine whose cranks are arranged at regular intervals of \(90^{\circ}\).1). There are 8 possible firing orders for the engine 2). Primary
In the below Fig. 65 shown, if the speed of the input shaft of the spur gear train is \(2400 \mathrm{rpm}\) and the speed of the output shaft is \(100 \mathrm{rpm}\), what is the module of the gear 4
Spiral gears are used to connect(a) two parallel shafts.(b) two intersecting shafts.(c) two non-parallel and non-intersecting shafts.(d) None of the above.
The crank of slider-crank punching press has a mass moment of inertia of \(1 \mathrm{kgm}^{2}\). The below Fig. 66 shows the torque demand per revolution for a punching operation. If the speed of the
A single cylinder, four-stroke I.C. engine rotating at \(900 \mathrm{rpm}\) has a crank length of \(50 \mathrm{~mm}\) and a connecting rod length of \(200 \mathrm{~mm}\). If the effective
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.
Consider the following statements:1). The effect of gyroscopic couple on a car while negotiating a curve is that its outer wheels tend to get lifted from the ground 2). If spin vector is rotated
Consider the following statements:1). The degree of freedom for lower kinematic pairs is always equal to one 2). A ball-and-socket joint has 3 degrees of freedom and is a higher kinematic pair 3).
A Hooke's joint is used to connect two(a) coplanar and non-parallel shafts(b) non-coplanar and non-parallel shafts(c) coplanar and parallel shafts(d) non-coplanar and parallel shafts.
Which one of the following governors is used to drive a gramophone?(a) Watt governor(b) Porter governor(c) Pickering governor(d) Hartnell governor.
In the Fig. 67 given below, the link 2 rotates at an angular velocity of \(2 \mathrm{rad} / \mathrm{s}\). What is the magnitude of Coriolis acceleration experienced by the link 4 ?(a) 0(b) \(0.8
The below Fig. 67 shows a cam with a circular profile, rotating with a uniform angular velocity of \(\omega \mathrm{rad} / \mathrm{s}\). What is the nature of displacement of the follower?(a)
Which one of the following expresses the sensitiveness of a governor?(a) \(\frac{N_{1}+N_{2}}{2 N_{1} N_{2}}\)(b) \(\frac{N_{1}-N_{2}}{2 N_{1} N_{2}}\)(c)
What is the number of nodes in a shaft carrying three rotors?(a) Zero(b) 2(c) 3(d) 4 .
In case of partial balancing of single-cylinder reciprocating engine, what is the primary disturbing force along the line of stroke?(a) \(\mathrm{cmr} \omega^{2} \cos \theta\)(b)
Consider the following statements:1). The condition of stability of a governor requires that the slope of the controlling force curve should be less than that of the line representing the centripetal
What is the number of instantaneous centres of rotation for a 6-link mechanism?(a) 4(b) 6(c) 12(d) 15 .
In which one of the following is a flywheel generally employed?(a) Lathe(b) Electric motor(c) Punching machine(d) Gearbox.
What is the value of pressure angle generally used for involute gears?(a) \(35^{\circ}\)(b) \(30^{\circ}\)(c) \(25^{\circ}\)(d) \(20^{\circ}\).
Consider the following statements:1). A stub tooth has a working depth larger than that of a full-depth tooth.2). The path of contact for involute gears in an arc of a circle.Which of the statements
Consider the following statements:Cam followers are generally classified according to 1). the nature of its motion 2). the nature of its surface in contact with the cam 3). the speed of the cam Which
Consider the following statements:Radius of friction circle for a journal bearing depends upon 1). coefficient of friction 2). radius of the journal 3). angular speed of rotation of the shaft Which
What is the maximum acceleration of a cam follower undergoing simple harmonic motion?(a) \(\frac{h}{2}\left(\frac{\pi \omega}{\phi}\right)^{2}\)(b) \(4 h\left(\frac{\omega^{2}}{\phi^{2}}\right)\)(c)
Consider the following statements:1). Lower pairs are more resistant than the higher pairs in a plane mechanism.2). In a 4-bar mechanism (with 4 turning pairs), when the link opposite to the shortest
What is automatic control?
A block diagram is represented by(a) circles(b) triangles(c) rectangles(d) parallelograms
What is a transducer? Explain the principle of operation of a transducer.
Differentiate between an automatic controller and process controller.
The output response of a first order system with excitation is:(a) \(y=x\left(1-e^{-t / \tau}\right)\)(b) \(y=x e^{-t / \tau}\)(c) \(y=x\left(1+e^{-t / \tau}\right)\)(d) \(y=x\left(1-e^{t
What is an actuator? List various types of actuators.
What is a regulator?
A simple Bourdon tube pressure gauge is a(a) closed-loop control system(b) open-loop control system(c) manually operated system(d) feed back control system.
What are the basic modeling elements for a mechanical system? Explain the function of each element.
Define open-loop control and closed-loop control.
The overall transfer function of two blocks \(G_{1}(s)\) and \(G_{1}(s)\) connected in series is(a) \(G_{1}(s)+G_{2}(s)\)(b) \(G_{1}(s) \times G_{2}(s)\)(c) \(G_{1}(s)-G_{2}(s)\)(d) \(G_{1}(s) /
Define the following:(a) Instantaneous response(b) Lagging response(c) Delayed response.
What is resistance?
The equivalent transfer function for a closed-loop control system is(a) \(\frac{K G(s)}{1+K G(s)}\)(b) \(\frac{K G(s)}{1-K G(s)}\)(c) \(\frac{1+K G(s)}{K G(S)}\)(d) \(\frac{1-K G(s)}{K G(s)}\)
What do you mean by rise-time, peak-time and settling time in connection with transient response specification?

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