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engineering
machine elements in mechanical design

Questions and Answers of Machine Elements In Mechanical Design

When the system is given a constant angular velocity rather than an angular displacement, it is known as(a) step function input(b) harmonic input(c) unit step displacement(d) variable input.
Consider the following statements:1). When frequency ratio is \(2\), the force transmitted to the foundations increases as the damping is decreased 3). The analysis of base-excited vibrations is
Consider the following statements:1). Critical or whirling speed of the shaft is the speed at which it tends to vibrate violently in the transverse direction 2). To find the natural frequency of a
Consider the following statements:Coriolis acceleration component appears in the acceleration analysis of the following planar mechanisms:1). Whitworth quick-return mechanism 2). Slider-crank
Which one of the following can completely balance several masses revolving in different planes on a shaft?(a) A single mass in one of the planes of the revolving mass(b) A single mass in any one
The curve traced by a point on the circumference of a circle which rolls along the inside of a fixed circle, is known as(a) epicycloid(b) hypocycloid(c) cardiod(d) involute.
Match List I with List II and select the correct answer using the codes given below the lists:List I (Forces)A. Inertia force B. Spring force C. Damping force D. Centrifugal force List II
In gears, interference takes place when(a) the tip of a tooth of mating gear digs into the portion between base and root circle(b) gear do not move smoothly in the absence of lubrication(c) pitch of
Match List I with List II an select the correct answer using the codes given below the lists: List I A. Quadric cycle chain B. Single slider crank chain C. Double slider crank chain D. Crossed slider
In a flat collar pivot bearing, the moment due to friction is proportional to \(\left(r_{1}\right.\) and \(r_{2}\) are the outer and inner radii respectively)(a)
A friction circle is drawn when a journal rotates in bearing. Its radius depends on the coefficient of friction and the(a) magnitudes of the forces on the journal(b) angular velocity of the
If the rotating mass of a rim type fly wheel is distributed on another rim type flywheel whose mean radius is half mean radius of the former, then energy stored in the latter at the same speed will
A flywheel is fitted to the crankshaft of an engine having ' \(E\) ' amount of indicated work per revolution and permissible limits of co-efficients of fluctuation of energy and speed as \(K_{e}\)
A Hartnell governor has its controlling force \(\mathrm{F}\) given by \(\mathrm{F}=\mathrm{p}+\mathrm{q}\), Where \(r\) is the radius of the balls and \(p\) and \(q\) are constants.The governor
The plots of controlling force versus radii of rotation of the balls of spring controlled governors are shown in the given Fig.2. A stable governor is characterised by the curve labelled. Controlling
A system in dynamic balance implies that(a) the system is critically damped(b) there is on critical speed in the system(c) the system is also statically balanced(d) there will be absolutely no wear
For a twin cylinder \(V\)-engine, the crank positions for Primary reverse cranks and Secondary direct cranks are given in the following Fig.3:The engine is a(a) \(60^{\circ} V\)-engine(b)
Which one of the following can completely balance several masses revolving in different planes on a shaft?(a) A single mass in one of the planes of the revolving masses(b) A single mass in a
With symbols having the usual meanings, the single degree of freedom system, \(m \ddot{x}+c \dot{x}+k x=F \sin \omega t\) represents(a) free vibration with damping(b) free vibration without
In the two-rotor system shown in the given Fig. \(4,\left(I_{1})\), a node of vibration is situated(a) between \(I_{1}\) and \(I_{2}\) but nearer to \(I_{1}\)(b) between \(I_{1}\) and \(I_{2}\) but
A simple spring mass vibrating system has a natural frequency of \(N\). If the spring stiffness is halfed and the mass is doubled, then the natural frequency will become(a) \(N / 2\)(b) \(2 N\)(c)
For the single degree of freedom system shown in the Fig.5, the mass \(M\) rolls along an incline of \(\alpha\). The natural frequency of the system will(a) increases as \(\alpha\) increases(b)
For the system shown in the given Fig. 6 the moment of inertia of the weight \(W\) and the ball about the pivot point is \(I_{o}\). The natural frequency of the system is given by\(f_{n}=\frac{1}{2
Rotating shafts tend to vibrate violently at whirling speeds because(a) the shafts are rotating at very high speeds(b) bearing centre line coincides with the shaft axis(c) the system in unbalanced(d)
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)
In a automobile service station, an automobile is in a lifted up position by means of a hydraulic jack. A person working in the service station gave a tap to one rear wheel and made it rotate by one
In involute gears the pressure angle is(a) dependent on the size of teeth(b) dependent on the size of gears(c) always constant(d) always variable.
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Consider the following statements in this regard:1). All points of the disc have the same
An elliptic trammel is shown in the given Fig.7. Associated with the motion of the mechanism are fixed and moving centrodes. It can be established analytically on graphically that the moving centrode
In a circular are cam with roller follower, the acceleration in any position of the lift would depend only upon(a) total lift, total angle of lift, minimum radius of cam and cam speed(b) radius of
The Klein's method of constuction for reciprocating engine mechanism(a) is a simplified version of instantaneous centre method(b) utilises a quadrilateral similar to the diagram of mechanism for
With reference to the mechanism shown in the Fig.8, the relation between \(F\) and \(P\) is(a) \(F=\frac{1}{2} P \cdot \tan \alpha\)(b) \(F=P \cdot \tan \alpha\)(c) \(P=2 F \cdot \tan \alpha\)(d)
In the given Fig. \(9, A B C D\) is a four-bar mechanism, At the instant shown \(A B\) and \(C D\) are vertical and \(B C\) is horizontal. \(A B\) is shorter than \(C D\) by \(30 \mathrm{~cm}, A B\)
The two-link system, shown in the given Fig.10, is constrained to move with planar motion. It possesses(a) 2 - degrees of freedom(b) 3 - degrees of freedom(c) 4 - degrees of freedom(d) \(6-\) degrees
Two co-axial rotors having moments of inertia \(I_{1}, I_{2}\) and angular speeds \(\omega_{1}\) and \(\omega_{2}\) respectively are engaged together. The loss of energy during engagment is equal
A spring controlled governor is found unstable. It can be made stable by(a) increasing the spring stiffness(b) decreasing the spring stiffness(c) increasing the ball weight(d) decreasing the ball
If a number of forces act on a rigid body, each force may be replaced by an equal and parallel force acting through a fixed point, together with a couple. For the rigid body to be in equilibrium,(a)
A rotor which is balanced statically but not dynamically is supported on two bearings \(\mathrm{L}\) apart and at high speed of the rotor, reaction of the left bearing is \(R\). The right side of the
Consider the following statements regarding a high speed in-line engine with identical reciprocating parts with cranks spaced to give equal firing intervals:1). All harmonic forces, except those
In the statement "an eccentric mass rotating at \(3000 \mathrm{rpm}\) will create \(X\) times more unbalanced force than \(50 \%\) of the same mass rotating at \(300 \mathrm{rpm}\)," ' \(X\) ' stands
A machine of \(100 \mathrm{~kg}\) mass has a \(20 \mathrm{~kg}\) rotor with \(0.5 \mathrm{~mm}\) eccentricity. The mounting springs have stiffness \(85 \mathrm{kN} / \mathrm{m}\) and damping is
Match List I (force transmissibility) with List II (frequency ratio) and select the correct answer using the codes given below the Lists: List I List II A. 1 1. >2 @ B. Less than 1 2. ==2 @ C.
A mass of \(1 \mathrm{~kg}\) is attached to the end of a spring with a stiffness \(0.7 \mathrm{~N} / \mathrm{mm}\). The critical damping coefficient of this system is(a) \(1.40 \mathrm{Ns} /
A system is shown in the following Fig.11. The bar \(A B\) is assumed to be rigid and weightless.The natural frequency of vibration of the system is given by(a) \(f_{n}=\frac{1}{2 \pi}
Two heavy rotating masses are connected by shafts of lengths \(l_{1}, l_{2}\) and \(l_{3}\) and the corresponding diameters are \(d_{1}, d_{2}\), and \(d_{3}\). This system is reduced to a
A shaft has two heavy rotors mound on it The transverse natural frequencies, considering each of the rotor separately, are 100 cycles/sec and 200 cycles/sec respectively. The lowest critical speed
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of \(2 \mathrm{~mm}\) from the axis of the shaft. When the shaft is allowed to
Let \(S\) and \(G\) be positions of centre of mass and geometric centre is a disc attached to a rotating disc with axis at \(O\) as shown Fig.12. Let the system be resisted by viscous damping. Then
Consider the following statements regarding the differential of an automobile 1). The speed of the crown wheel will always be the mean of the speeds of the two road wheels 2). The road wheel speeds
A single epicyclic gear train is shown in the given Fig.13. Wheel \(A\) is stationary. If the number of teeth on \(A\) and \(B\) are 120 and 45 respectively, then when \(B\) rotates about its own
A round bar \(A\) passes through the cylindrical hole in \(B\) as shown in the given Fig.14. Which one of the following statements is correct in this regard?(a) The two links shown from a kinematic
The instantaneous centre of rotation of a rigid thin disc rolling on a plane rigid surface is located at(a) the centre of the disc(b) an infinite distance on the plane surface(c) the point of
The directions of Coriolis component of acceleration, \(2 \omega V\), of the slider \(A\) with respect to the coincident point \(B\) is shown in Fig. 15. (1 to 4). Directions shown by figures(a) 2
Klein's construction for determining the acceleration of piston \(P\) is shown in the given Fig.16. When \(N\) coincides with \(O\),(a) acceleration of piston is zero and its velocity is zero(b)
A torsional system with discs of moment of inertia \(I_{1}\) and \(I_{2}\), shown in the given Fig.17, is gear driven such that the ratio of the speed of shaft \(B\) to shaft \(A\) is ' \(n\) '.
Which one of the following pairs is not correctly matched?(a) Positive drive ... Belt drive(b) High velocity ratio ... Worm gearing(c) To connect non-parallel and non-intersecting shafts ... Spiral
Consider the following expressions for a spur gear:1). Addendum \(=1 / p_{d}\)2). Clearance \(=p_{c} / 20\)3). Centre distance for internal gears \(=\left(T_{1}+T_{2}\right) / 2 P_{d}\)4). Dendendum
Babbit lining is used on brass/bronze bearing to(a) increases bearing resistance(b) increase compressive strength(c) provide antifriction properties(d) increase wear resistance.
In an oil-lubricated journal bearing, coefficient of friction between the journal and the bearing.(a) remains constant at all speeds(b) is minimum at zero speed and increases monotonically with
The given Fig. 18 shows the output torque plotted against crank positions for a single cylinder four-stroke-cycle engine. The areas lying above the zero-torque line represent positive work and the
For a spring controlled governor to be stable, the controlling force \((F)\) is related to the radius \((r)\) by the equation.(a) \(F=a r-b\)(b) \(F=a r+b\)(c) \(F=a r\)(d) \(F=a / r+b\)
A rotor supported at \(A\) and \(B\), carries two masses as shown in the given Fig.19. The rotor is(a) dynamically balanced(b) statically balanced(c) statically and dynamically balanced(d) not
The equation of free vibrations of a system is \(\ddot{X}+36 \pi^{2} X=0\). Its natural frequency is(a) \(46 \mathrm{~Hz}\)(b) \(3 \pi \mathrm{Hz}\)(c) \(3 \mathrm{~Hz}\)(d) \(6 \pi \mathrm{Hz}\).
Which of the following methods can be used to determine the damping of machine element?1). Logarithmic method 2). Band-width method 3). Rayleigh method 4). Holzer method. Select the correct answer
If \(\omega / \omega_{n}=\sqrt{2}\), where \(\omega\) is the frequency of excitation and \(\omega_{n}\) is the natural frequency of vibrations, then the transmissibility of vibrations will be(a)
A slender shaft supported on two bearing at its ends carries a disc with an eccentricity \(e\) from the axis of rotation. The critical speed of the shaft is \(N\). If the disc is replaced by a second
For the spring-mass system shown in the Fig.20(a), the frequency of vibration is \(N\). What will be the frequency when one more similar spring is added in series, as shown in Fig.20(b)?(a) \(N /
Which one of the following is true for involute gears?(a) Interference is inherently absent(b) Variation in centre distance of shafts increases radial force(c) A convex flank is always in contact
The gear train usually employed in clocks is a(a) reverted gear train(b) simple gear train(c) sun and planet gear(d) differential gear.
Which one of following is an Open Pair?(a) Ball and socket joint(b) Journal bearing(c) Lead screw and nut(d) Cam and follower.
In the mechanism \(A B C D\) shown in the given Fig.21, the fixed link is denoted as (1), Crank \(A B\) as (2), rocker \(B D\) (3), Swivel trunnion at \(C\) as (4) The instantaneous centre \(I_{4}\)
The instantaneous centre of motion of rigid-thin disc-wheel rolling on plane rigid surface shown in the Fig.22, is located at the point.(a) \(A\)(b) \(B\)(c) \(C\)(d) \(D\). oo+ D B C A Fig.22
In a cam drive with uniform velocity follower, the slope of the displacement must be as shown in Fig.23(a). But in actual practice it is as shown in Fig.23 (b) (i.e. rounded at the corners).This is
In a 4-stroke I.C engine, the turning moment during the compression stroke is(a) positive throughout(b) negative throughout(c) positive during major portion of the stroke(d) negative during major
With reference to the engine mechanism shown in the given Fig.24, match List I with List II and select the correct answer FR Fw- G W Fig.24 List II Fo 10 List I A. Fo 1. Inertia force of
A compound train consisting of spur, bevel and spiral gears is shown in the given Fig. 25 along with the teeth numbers marked against the wheels. Over-all speed ratio of the train is(a) 8(b) 2(c)
Which of the following statements hold good for a multi-collar thrust bearing carrying an axial thrust of \(W\) units?1). Friction moment is independent of the number of collars 2). The intensity of
The centre of gravity of the coupler link in a 4-bar mechanism would experience(a) no acceleration(b) only linear acceleration(c) only angular acceleration(d) both linear and angular accelerations.
Which of the following statements regarding laws governing the friction between dry surfaces are correct?1). The friction force is dependent on the velocity of sliding 2). The friction force is
Which of the following statements are correct?1). For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the
Which one of the following equations is valid with reference to the given Fig.26.(a) \(\omega^{2}=\left(\frac{W}{w}\right)\left(\frac{g}{h}\right)\)(b)
Match list I with List II and select the correct answer List I A. Hunting List II 1. One radius of rotation for each speed B. Isochronism 2. Too sensitive C. Stability D. Effort 3. Mean force exerted
A system of masses rotating in different parallel planes is in dynamic balance if the resultant.(a) force is equal to zero(b) couple is equal to zero(c) force and the resultant couple are both equal
When shaking force is transmitted through the spring, damping becomes detrimental when the ratio of its frequency to the natural frequency its greater than(a) 0.25(b) 0.50(c) 1.00(d) sqrt 2.
When the mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, it will(a) return to equilibrium position without oscillation(b)
The equation of motion for a single degree of freedom system with viscous damping is \(4 \ddot{x}+9 \dot{x}+16 x=0\). The damping ratio of the system is(a) \(\frac{9}{128}\)(b) \(\frac{9}{16}\)(c)
For the spring-mass system shown in the given Fig.27, the frequency of oscillations of the block along the axis of the spring is(a) \(\frac{1}{2 \pi} \sqrt{\frac{k_{1}-k_{2}}{m}}\)(b) \(\frac{1}{2
The critical speed of a rotating shaft depends upon(a) mass(b) stiffness(c) mass and stiffness(d) mass, stiffness and eccentricity.
A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the
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
Match List I with List II and select the answer using the codes given below the Lists. List I A. Helical gears B. Herringbone gears C. Worm gears D. Hypoid Gears List II 1. Non-interchangeable 2.
Given \(\theta=\) angle through which the axis of the outer forward wheel turns\(\phi=\) angle through which the axis of the inner forward wheel turns\(a=\) distance between the pivots of front axle,
If air resistance is neglected, while it is executing small oscillations the acceleration of the bob of a simple pendulum at the mid-point of its swing will be(a) zero(b) a minimum but not equal to
In the Fig. 28 shown crank \(A B\) is \(15 \mathrm{~cm}\) long and is rotating at \(10 \mathrm{rad} / \mathrm{s} . C\) is vertically above \(A\). \(C A\) equals \(24 \mathrm{~cm} . C\) is swivel
In order to draw the acceleration diagram, it is necessary to determine the Coriolis component of acceleration in the case of(a) crank and slotted lever quick return mechanism(b) slider-crank
What is the correct sequence of the following steps in engine analysis?1). Vibration analysis 2). Inertia force analysis 3). Balancing analysis 4). Velocity and Acceleration analysis Select the
If \(\mu\) is the actual coefficient of friction in a belt moving in grooved pulley, the groove angle being \(2 \alpha\), the virtual coefficient of friction will be(a) \(\mu / \sin \alpha\)(b) \(\mu
Match List I (Positioning of two shafts) with List II (Possible connection) and select the correct answer using the codes given below the Lists: List I A. Parallel shaft with slight offset B.
Match List I with List II and select the correct answer using the codes given below the Lists: List I A. Quadric cycle chain B. Single slider crank chain C. Double slider crank chain D. Crossed
Match List I with List II and select the correct answer using the codes given below the Lists: List I (Bearing) A. Ball bearing B. Tapered Roller bearings C. Spherical Roller bearings D. Needle

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