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engineering
machine elements in mechanical design

Questions and Answers of Machine Elements In Mechanical Design

In a journal bearings, the radius of the friction circle increases with the increase in(a) load(b) radius of the journal(c) speed of the journal(d) viscosity of the lubricant.
Match List I with List II and select the correct answer using the codes given below the Lists: List I A. Flywheel B. Governor C. Critical speed D. Inertia force List II 1. Dunkerley Method 2. Turning
The sensitivity of an isochronous governor is(a) zero(b) one(c) two(d) infinity.
When the primary direct crank of a reciprocating engine is positioned at \(30^{\circ}\) clockwise, the secondary reverse crank for balancing will be at(a) \(30^{\circ}\) anti-clockwise(b)
A statically-balanced system is shown in the given Fig.29. Two equal weights \(W\), each with an eccentricity, ' \(e\) ' are placed on opposite sides of the axis in the same axial plane. The axial
A damped free vibration is expressed by the general equation \(x=X e^{-\zeta \omega_{n} t} \sin \left(\sqrt{1-\zeta^{2}} \omega_{n} t+\phi\right)\) which is shown in Fig. 30 :The envelope \(A\) has
What is the equivalent stiffness (i.e. spring constant) of the system shown in the given Fig. 31.(a) \(24 \mathrm{~N} / \mathrm{mm}\)(b) \(16 \mathrm{~N} / \mathrm{mm}\)(c) \(4 \mathrm{~N} /
The given Fig. 32 depicts a vector diagram of forces and displacements in the case of Forced Damped Vibration. If vector \(A\) represents the forcing function \(P=P_{o} \sin \omega t\), vector \(B\)
Two heavy rotating masses are connected by shafts of length \(l_{1}, l_{2}\), and \(l_{3}\) and the corresponding diameters and \(d_{1}, d_{2}\), and \(d_{3}\). This system is reduced to a
An axial flow fan balanced at one speed often exhibits substantial vibrational effects when operated at other speeds, mainly due to(a) primary critical speed effect(b) secondary critical speed
In the case of an involute toothed gear, involute starts from(a) addendum circle(b) dedundum circle(c) pitch circle(d) base circle.
A reverted gear train is one in which the output shaft and input shaft?(a) rotate in opposite directions(b) are co-axial(c) are at right angles to each other(d) are at an angle to each other.
In the epicyclic gear train shown in the given Fig. \(33, A\) is fixed. \(A\) has 100 teeth and \(B\) has 20 teeth. If the arm \(C\) makes three revolutions, the number of revolutions made by \(B\)
Given that \(G=\) forward path given and \(H=\) feed back path gain, if \(G\) and \(H\) are functions of frequency, then the feedback would affect gain \(G\) of a non-feedback system by a value to(a)
Two geared shafts \(A\) and \(B\) having moments of inertia \(I_{a}\) and \(I_{b}\) and angular acceleration \(\alpha_{a}\) and \(\alpha_{b}\) respectively are meshed together. \(B\) rotates at \(G\)
Which of the following pair \((s)\) is/are correctly matched?I. Four bar chain Oscillating-oscillating converter II. Inertia governor Rate of change of engine speed III. Hammer blow Reciprocating
Which of the following are examples of kinematic chain?Select the correct answer using the codes given below:(a) 1,3 , and 4(b) 2 and 4(c) 1,2 , and 3(d) \(1,2,3\), and 4 . 1. 3. Q 4. Fig.34
Which of the following pairs are correctly matched? Select the correct answer using the codes given below the pairs.Codes:(a) 1 and 2(b) 1,2 , and 3(c) 1 and 3(d) 2 and 3 . Mechanism 1. Whitworth
In S.H.M. with respect to the displacement vector, the positions of Velocity vector and Acceleration vectors will be respectively(a) \(180^{\circ}\) and \(90^{\circ}\)(b) \(90^{\circ}\) and
When a slider moves with a velocity ' \(V\) ' on a link rotating at an angular speed of \(\omega\), the Corioli's component of acceleration is given by(a) \(\sqrt{2} V \omega\)(b) \(V \omega\)(c)
Two links \(O A\) and \(O B\) are connected by a pin joint at ' \(O\) '. The link \(O A\) turns with angular velocity \(\omega_{1} \mathrm{rad} / \mathrm{s}\) in the clockwise direction and the link
The total number of instantaneous centres for a mechanism consisting of ' \(n\) ' links is(a) \(n / 2\)(b) \(n\)(c) \(\frac{n-1}{2}\)(d) \(\frac{n(n-1)}{2}\).
In a cam drive, it is essential to off-set the axis of a follower to(a) Decrease the side thrust between the follower and guide(b) Decrease the wear between follower and cam surface(c) Take care of
The working surface above the pitch surface of the gear tooth is termed as(a) Addendum(b) Dedendum(c) Flank(d) Face.
In the case of a flywheel, the maximum fluctuation of energy is the(a) Sum of maximum and minimum energies(b) Difference between the maximum and minimum energies(c) Ratio of the maximum, and minimum
Which one of the following figures respresenting Hooke's jointed inclined shaft system will result in a velocity ratio of unity? (c) (d) Fig.35 a/2 B12
Given that:\(m=\) mass of the ball of the governor,\(\omega=\) angular velocity of the governor, and\(g=\) accelerate due to gravity, The height of Watt's governor is given by(a) \(\frac{g}{2
Match List I with List II and select the correct answer using the codes given below the lists: List I List II A. End thrust B. No cage C. More accurate centering D. Can be overloaded 1. Plain bearing
For a given fractional change of speed, if the displacement of the sleeve is high, then the governor is said to be(a) Hunting(b) Isochronous(c) Sensitive(d) Stable.
A four-cylinder symmetrical in-line engine is shown in the given Fig.36. Reciprocating weights per cylinder are \(R_{1}\) and \(R_{2}\) and the corresponding angular disposition of the crank are
In a multicylinder in-line internal combustion engine, even number of cylinders is chosen so that(a) Uniform firing order is obtained(b) The couples are balanced(c) Primary forces are balanced(d)
The amplitude versus time curve of a damped-free vibration is shown in the below Fig.37. Curve labelled ' \(A\) ' is(a) A logarithmic decrement curve(b) An exponentially decreasing curve(c) A
If a mass ' \(m\) ' oscillates on a spring having a mass \(m_{s}\) and stiffness ' \(k\) ', then the natural frequency of the system is given by(a) \(\sqrt{\frac{k}{m+\frac{m_{s}}{3}}}\)(b)
Match List I with List II and select the correct answer using the codes given below the lists: List I A. Node and mode B. Equivalent inertia C. Log decrement D. Resonance List II 1. Geared vibration
Two shafts are shown in the below Fig.38. These two shafts will be torsionally equivalent to each other if their(a) Polar moment of inertias are the same(b) Total angle of twists are the same(c)
The critical speed of a uniform shaft with a rotor at the centre of the span can be reduced by(a) Reducing the shaft length(b) Reducing the rotor mass(c) Increasing the rotor mass(d) Increasing the
Consider the following characteristics:1). Small interference 2). Strong tooth 3). Low production cost 4). Gear with small number of teeth Those characteristics which are applicable to Stub
A physical system is translated into functional block diagram of the type shown in the Fig.39. The command input \(r(t)\) and controlled output \(c(t)\) of this system are given by(a)
If a compression coil spring is cut into two equal parts and the parts are then used in parallel, the ratio of the spring rate to its initial value will be(a) 1(b) 2(c) 4(d) Indeterminable for want
Match List I with List II and select the correct answer using the codes given below the Lists: Codes: List I A. 4 links, 4 turning pairs B. 3 links, 3 turning pairs C. 5 links, 5 turning pairs D.
The relative acceleration of two points which are at variable distance apart on a moving link can be determined by using the(a) Three centres in line theorem(b) Instantaneous centre of rotation
Consider a four-bar mechanism shown in Fig.40.The driving link \(D A\) is rotating uniformly at a speed of \(100 \mathrm{rpm}\). Clockwise. The velocity of \(A\) will be(a) \(300 \mathrm{~cm} /
Which one of the following pairs is correctly matched?(a) Governors ... Interference(b) Gears ... Hunting(c) Klein's construction Acceleration of piston(d) Cam ... Pinion.
A link \(A B\) is subjected to a force \(F(\rightarrow)\) at a point \(P\) perpendicular to the link at a distance ' \(a\) ' from the \(C G\) as shown in Fig. 41. This will result in A F P a F CG F B
The primary disturbing force due to inertia of reciprocating parts of mass \(m\) at radius \(r\) moving with an angular velocity \(\omega\) is given by(a) \(m \omega^{2} r \sin \theta\)(b) \(m
Consider the following statements:A pinion of \(14 \frac{1^{\circ}}{2}\) pressure angle and 48 involute teeth has a pitch circle diameter of \(28.8 \mathrm{~cm}\). It has(a) 2 and 3(b) 1 and 3(c) 1
For a given lift of the followers in a given angular motion of the cam, the acceleration/retardation of the follower will be the least when the profile of the cam during the rise portion is(a) Such
Consider the following statements regarding the choice of conjugate teeth for the profile of mating gears:1). They will transmit the desired motion 2). They are difficult to manufacture 3).
The motion transmitted between the teeth of two spur gears in mesh is generally(a) Sliding(b) Rolling(c) Rotary(d) Partly sliding and partly rolling.
In a single slide four-bar linkage, when the slider is fixed, it forms a mechanism of(a) Hand pump(b) Rolling?(c) Quick return(d) Oscillating cylinder.
Consider the following parameters:1). Limit of peripheral speed 2). Limit of centrifugal stress 3). Coefficient of fluctuation of speed 4). Weight of the rim Which of these parameters are used in the
Consider the following speed governors:1). Porter governor 2). Hartnell governor 3). Watt governor 4). Proell governor The correct sequence of development of these governor is(a) \(1,3,2,4\)(b)
If a two-mass system is dynamically equivalent to a rigid body, then the system will not satisfy the condition that the(a) Sum of the two masses must be equal to that of the rigid body(b) Polar
A rigid shaft when laid on horizontal parallel ways will not roll if the(a) Centre of gravity falls parallel(b) Centre of gravity lies on the shaft axis(c) Horizontal moments are large(d) Vertical
If the ratio of the length of connecting rod to the crank radius increases, then(a) Primary unbalanced forces will increase(b) Primary unbalanced forces will decrease(c) Secondary unbalanced forces
If a spring-mass-dashpot system is subjected to excitation by a constant harmonic force, then at resonance, its amplitude of vibration will be(a) Infinity(b) Inversely proportional to damping(c)
In a forced vibration with viscous damping, maximum amplitude occurs when forced frequency is(a) Equal to natural frequency(b) Slightly less than natural frequency(c) Slightly greater than natural
The value of the natural frequency obtained by Rayleigh's method(a) Is always greater than the actual fundamental frequency(b) Is always less than the actual fundamental frequency(c) Depends upon the
In a multi-rotor system of torsional vibration maximum number of nodes that can occur is(a) Two(b) Equal to the number of rotor plus one(c) Equal to the number of rotors(d) Equal to the number of
A rotating shaft carries a flywheel which overhangs on the bearing as a cantilever. If this flywheel weight is reduced to half of its original weight, the whirling speed will(a) Be double(b) Increase
Consider the gear train shown in the given Fig. 42 and table of gears and their number of teeth.Gears \(B C\) and \(D E\) are moulded on parallel shaft rotating together.If the speed of \(A\) is
Consider the following statements in respect of introduction of feedback in a control system:1). It enhances its gain 2). It attenuates the unwanted noise 3). It helps in improving the accuracy of
The kinematic chain shown in the given Fig. 43 is a(a) structure(b) mechanism with one degree of freedom(c) mechanism with two degrees of freedom(d) mechanism with more than two degrees of freedom.
A point on a link connecting a double slider crank chain will trace a(a) straight line(b) circle(c) parabola(d) ellipse.
A wheel is rolling on a straight level track with a uniform velocity ' \(v\) '. The instantaneous velocity of a point on the wheel lying at the mid-point of a radius.(a). varies between \(3
A four-bar chain has(a) all turning pairs(b) one turning pair and the others are sliding pairs(c) one sliding pair and the others are turning pairs(d) all sliding pairs.
Sensitiveness of a governor is defined as(a) \(\frac{\text { Range of speed }}{2 \times \text { Mean speed }}\)(b) \(\frac{2 \times \text { Mean speed }}{\text { Range of speed }}\)(c) Mean speed
Masses \(B_{1}, B_{2}\) and \(9 \mathrm{~kg}\) are attached to a shaft in parallel planes as shown in the given Fig.44. If the shaft is rotating at \(100 \mathrm{rpm}\), the mass \(B_{2}\) is(a) \(3
The equation of motion for a damped viscous vibration is \(3 \ddot{x}+9 \dot{x}+27 x=0\)The damping factor is(a) 0.25(b) 0.50(c) 0.75(d) 1.00 .
A mass is suspended at the bottom of two springs in series having stiffness \(10 \mathrm{~N} / \mathrm{mm}\) and \(5 \mathrm{~N} / \mathrm{mm}\). The equivalent spring stiffness of the two springs is
The velocity ratio in the case of compound train of wheels is equal to(a) \(\frac{\text { No. of teeth on first driver }}{\text { No. of teeth on last follower }}\)(b) \(\frac{\text { No. of teeth on
Consider the following pairs of parts:1). Pair of gear in mesh 2). Belt and pulley 3). Cylinder and piston 4). Cam and follower Among these, the higher pairs are(a) 1 and 4(b) 2 and 4(c) 1,2 , and
Which one of the following sets of accelerations is involved in the motion of the piston inside the cylinder of a uniformly rotating cylinder mechanism?(a) Coriolis and radial acceleration(b) Radial
Consider the following statements:1). Round bar in a round hole forms a turning pair 2). A square bar in a square hole forms a sliding pair 3). A vertical shaft in a foot-step bearing forms a
Consider the following pairs of types of bearings and applications:1). Partial Journal bearing ... Rail wagon axles 2). Full Journal bearing ... Diesel engine crankshaft 3). Radial bearing ...
Consider the following statements regarding the turning moment diagram of a reciprocating engine shown in the Fig.45:1). It is a four stroke IC engine 2). The compression stroke is \(0^{\circ}\) to
The pitching of a ship in the ocean is an oscillatory periodic motion. A ship is pitching \(6^{\circ}\) above and \(6^{\circ}\) below with a period of \(20 \mathrm{~s}\) from its horizontal plane.
The critical speed of a shaft is affected by the(a) diameter and the eccentricity of the shaft(b) span and the eccentricity of the shaft(c) diameter and the span of the shaft(d) span of the shaft.
Match List I with List II and select the correct answer using the codes given below the lists: List I A. Compound train B. Quick return Mechanism C. Exact straight line motion D. Approximate straight
Match List I (Kinematic inversions) with List II (Applications) and select the correct answer using the codes given below the lists: List I List II A. 1. Hand pump B. 2. Compressor C. 3. Whitworth
Match List I (Applications) with List II (Features of vibration) and select the correct answer using the codes given below the lists: List I A. Vibration damper B. Shock absorber C. Frahm Tachometer
When the intensity of pressure is uniform in a flat pivot bearing of radius \(r\), the friction force is assumed to act at(a) \(r\)(b) \(\frac{r}{2}\)(c) \(\frac{2 r}{3}\)(d) \(\frac{r}{3}\).
Consider a harmonic motion \(x=1.25 \sin (5 t-\pi / 6) \mathrm{cm}\). Match List I with List II and select the correct answer using the codes given below the Lists: List I List II 1. 55 2 A.
Which of the flowing pairs of devices and their functions are correctly matched?Codes:(a) 1,3 , and 4(b) 2 and 3(c) 1 and 2(d) 2 and 4 . 1. Flywheel 2. Governors 3. Lead screw in lathe 4. Fixtures
Match list I with list II and select the correct answer using the codes given below the lists. (Notations have their usual meanings): sin 0 2n List I A. Law of correct steering B. Displacement
Force required to accelerate a cylindrical body which rolls without slipping on a horizontal plane (mass of cylindrical body is \(m\), radius of the cylindrical surface in contact with plane is
Consider the following statements regarding motions in machines:1). Tangential acceleration is a function of angular velocity and the radial acceleration is a function of angular acceleration.2). The
Consider the following statements:In petrol engine mechanism, the piston is at its dead centre position when piston 1). acceleration is zero 2). acceleration is maximum 3). velocity is zero 4).
The speed of driving shaft of a Hooke's joint of angle \(19.5^{\circ}\) (given \(\sin 19.5^{\circ}=.33, \cos 19.5^{\circ}=.94\) ) is \(500 \mathrm{rpm}\). The maximum speed of the driven shaft is
The given Fig. 46 shows the Klein's construction for acceleration of the slider-crank mechanism. Which one of the following quadrilaterals represents the required acceleration diagram?(a) ORST(b) \(O
A servomotor is connected through a gear ratio of 10 (i.e., motor speed: load side speed \(=\) 10:1) to a load having moment of inertia \(J\). The equivalent parameter referred to motor shaft side
Match List I with List II and select the correct answer using the codes given below the Lists: List I A. Cam and follower B. Screw pair C. 4-bar mechanism D. Degree of freedom of planar mechanism
Consider the following statements:When two gears are meshing, the clearance is given by the 1). difference between dedendum of one gear and addendum of the mating gear 2). difference between total
A body of mass \(m\) and radius of gyration \(k\) is to be replaced by two masses \(m_{1}\) and \(m_{2}\) located at distances \(h_{1}\) and \(h_{2}\) from the \(C G\) of the original body. An
Match List I and List II and select the correct answer using the code given below the Lists: List I A. Undercutting B. Addendum C. Lewis equation D. Worm and wheel Codes: A B C D (a) 2 5 1 (b) 1 (c)
The natural frequency of transverse vibration of a massless beam of length \(L\) having a mass \(m\) attached at its midspan is given by ( \(E I\) is the flexural rigidity of the beam)(a)
Match List I with List II and select the correct answer using the codes given below the Lists: List I A. 6 d.o.f. system B. 1 d.o.f. system C. 2 d.o.f. system D. Multi d.o.f. system Codes: (a) 1 (b)
A shaft carries a weigh \(W\) at the centre. The \(C G\) of the weight is displaced by an amount \(e\) from the axis of the rotation. If \(\mathrm{y}\) is the additional displacement of the \(C G\)
In a simple gear train, if the number of idler gears is odd, then the direction of motion of driven gear will(a) be same as that of the driving gear(b) be opposite to that of the driving gear(c)
When a vehicle travels on a rough road whose undulations can be assumed to be sinusoidal, the resonant conditions of the base-excited vibrations, are determined by the(a) mass of the vehicle,

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