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engineering
machine elements in mechanical design

Questions and Answers of Machine Elements In Mechanical Design

The type of follower used in automobiles is(a) knife edge(b) roller(c) mushroom with flat face(d) mushroom with spherical face.
The minimum radius circle drawn to the cam profile is called(a) prime circle(b) base circle(c) pitch circle(d) pitch curve.
The reference point on the follower for the purpose of laying the cam profile is known as(a) pitch point(b) trace point(c) roller centre(d) cam centre.
The pressure angle of a cam is defined as the angle between the line of motion of the follower and the(a) tangent on the pitch curve(b) normal on the pitch curve(c) tangent on the cam profile(d)
The cam profile and pitch curves are same for(a) roller follower(b) knife edge follower(c) mushroom follower(d) flat-faced follower.
The size of the cam depends upon(a) base circle(b) prime circle(c) pitch circle(d) pitch curve.
The point on the cam with maximum pressure angle is called the(a) pitch point(b) trace point(c) cam centre(d) roller centre.
Pressure angle of a cam is directly proportional to(a) base circle diameter(b) pitch circle diameter(c) prime circle diameter(d) lift of cam.
The throw of a cam is the maximum lift of the follower from(a) base circle(b) pitch circle(c) prime circle(d) pitch curve.
For S.H.M cam and follower, the maximum velocity is(a) \(\pi w h /(2 \theta)\)(b) \(\pi \omega h / \theta\)(c) \(\pi \omega h / 4 \theta\)(d) \(\pi \omega h /(3 \theta)\) where \(h=\) lift.
For S.H.M cam and follower, the maximum acceleration is(a) \((\pi \omega / \theta)^{2}(h / 2)\)(b) \((\pi \omega / \theta)^{2} h\)(c) \((\pi \omega / \theta)^{2}(h / 4)\)(d) \(2 h(\pi / \omega)^{2}\).
For a uniformly accelerated cam, the maximum velocity is(a) \(2(\omega h / \theta)\)(b) \(0.5(\omega h / \theta)\)(c) \((\omega h / \theta)\)(d) \(4(\omega h / \theta)\).
For a uniformly accelerated cam, the maximum acceleration is(a) \(2(\omega / \theta)^{2} h\)(b) \(0.5(\omega / \theta)^{2} h\)(c) \(4(\omega / \theta)^{2} h\)(d) \(0.25(\omega / \theta)^{2} h\).
Draw the profile of a cam operating a knife-edge follower when the axis of the follower passes through the axis of the cam shaft. The following data is given: Lift \(=40 \mathrm{~mm}\), angle of
If the follower in Exercise 8.1 is offset by \(25 \mathrm{~mm}\), then draw the cam profile.Data from in exercise 8.1Draw the profile of a cam operating a knife-edge follower when the axis of the
A cam with \(30 \mathrm{~mm}\) as minimum diameter is rotating clockwise at a uniform speed of \(1200 \mathrm{rpm}\) and operates a roller follower of \(10 \mathrm{~mm}\) diameter as given below:(i)
If the follower in Exercise 8.3 is offset by \(20 \mathrm{~mm}\), then draw the cam profile.Data from in exercise 8.3A cam with \(30 \mathrm{~mm}\) as minimum diameter is rotating clockwise at a
Draw the cam profile from the following data if the radial follower moves with simple harmonic motion during ascent and uniform acceleration and deceleration during descent: \(L\) ift \(=40
If the roller follower is offset by \(20 \mathrm{~mm}\) in Exercise 8.5, then draw the cam profile.Data from in exercise 8.5Draw the cam profile from the following data if the radial follower moves
Draw the profile of a cam to give reciprocating motion to a flat-faced follower for the following data:Lift \(=25 \mathrm{~mm}\), Ascent \(=120^{\circ}\), Dwell \(=30^{\circ}\), Descent
The following data refers to a symmetrical circular arc cam operating a flat-faced follower: Least radius of cam \(=30 \mathrm{~mm}\), Lift \(=12.5 \mathrm{~mm}\), Angle of lift \(=55^{\circ}\), Nose
The following data refers to a circular arc cam operating a flat-faced reciprocating follower:Minimum radius of cam \(=30 \mathrm{~mm}\), Total angle of cam \(=120^{\circ}\), Radius of circular arc
A symmetrical tangent cam with least radius of \(30 \mathrm{~mm}\) operates a roller follower of \(10 \mathrm{~mm}\) radius.The angle of ascent is \(60^{\circ}\) and lift is \(20 \mathrm{~mm}\). The
The following data refers to a tangent cam operating a radial roller follower: Minimum radius of cam \(=45 \mathrm{~mm}\), Lift \(=15 \mathrm{~mm}\), Nose radius \(=18 \mathrm{~mm}\), Radius of
The following data refers to a cam with circular nose and flanks operating the suction valve of a four-stroke petrol engine:Lift \(=10 \mathrm{~mm}\), Least radius of cam \(=20 \mathrm{~mm}\), Nose
Which of the following mechanisms generetes approximate straight line?(a) Hart mechanism (b) Watt mechanism(c) Peaucellier mechanism (d) Scott-Russel mechanism
Which of the following mechanisms generates accurate straight line?(a) Scott-Russel mechanism (b) Grasshopper mechanism(c) Watt mechamism (d) Tehebicheff mechanism
Geneva wheel is used to generete(a) circular motion (b) intermittent motion(c) continuous motion (d) parcbolic motion
Lazy tongs generete(a) straight line motion (b) circular motion(c) simple harmonic motion (d) uniformly accelereted motion.
Davis steering gear has(a) only turning pairs (b) only sliding pairs(c) both sliding and turning pairs (d) rolling pairs
Ackermann steering gear has(a) only sliding pairs (b) only turning pairs(c) both sliding and turning pairs (d) spherical pairs
Name the steering gears used in automobiles.
Compare Davis and Ackermann steering gears.
Write the fundamental equation for correct steering.
What is a Hooke’s joint? Where it is used?
Write the expression for ratio of angular velocities of shafts for a Hooke’s joint.
Draw the polar velocity diagram of a Hooke’s joint and mark its salient features.
Write the expressions for maximum and minimum speeds of driven shaft in a Hooke’s joint.
What is a double Hooke’s joint? What is its use?
Write the condition for the speeds of two shafts to be same in a Hooke’s joint.
The intermediate shaft of a double Hooke's joint is inclined at \(15^{\circ}\) to each. The input and output forks on the intermediate shaft have been assembled by mistake at \(90^{\circ}\) to one
Two shafts are connected by a Hooke's joint. The driving shaft rotates uniformly at \(600 \mathrm{rpm}\). If the total permissible variation in speed of the driven shaft is not to exceed \(\pm 5 \%\)
The moment of inertia of the driven shaft in a Hooke's joint is \(35 \mathrm{~kg} . \mathrm{m}^{2}\). The driven shaft is inclined at \(30^{\circ}\) to the axis of the driving shaft. The driving
In a Davis steering gear, the distance between the pivots of the front axle is \(1.2 \mathrm{~m}\) and the wheel base is \(2.8 \mathrm{~m}\). Find the inclination of each arm to the longitudinal axis
The distance between the pivots of the front stub axles of a car is \(1.35 \mathrm{~m}\). The length of track rod is \(1.25 \mathrm{~m}\). The wheel track is \(1.5 \mathrm{~m}\) and the wheel base is
In a Scott-Russel mechanism shown in Fig.4.40, \(O A 1=30 \mathrm{~cm}, A 1 C 1=40 \mathrm{~cm}\). Find the length of the extended link \(A_{1} B_{1}\) so that point \(B_{1}\) is generating an
What is friction? Is it necessary evil or blessing?
Describe various types of friction.
State the laws of friction.
Define coefficient of friction, angle of friction, and angle of repose.
When a screw jack is self-locking and self-hauling?
What are the limits on the efficiency of a screw jack to be of the self-locking type?
Explain uniform pressure and uniform wear theories for a clutch.
What are thin-film and thick-film lubrications?
What are anti-friction bearings?
Explain friction circle.
Friction is a curse in case of(a) Belt drive(b) Lathe slide(c) Brakes(d) Clutches
Force of friction does not depend upon(a) Area of contacting surfaces(b) Material of contacting surfaces(c) Velocity of sliding(d) Temperature
If \(\mu=\) coefficient of friction, and \(\phi=\) angle of friction, then \(\mu\) is equal to(a) \(\sin \phi\)(b) \(\cos \phi\)(c) \(\tan \phi\)(d) \(\cot \phi\)
Angle of cone of friction is equal to ( \(\phi=\) angle of friction)(a) \(\phi\)(b) \(2 \phi\)(c) \(1.5 \phi\)(d) \(3 \phi\)
The efficiency of screw jack for raising the load is(a) \(\frac{\tan \alpha}{\tan (\alpha-\phi)}\)(b) \(\frac{\tan \alpha}{\tan (\alpha+\phi)}\)(c) \(\frac{\tan (\alpha-\phi)}{\tan \alpha}\)(d)
The maximum efficiency of a screw jack is(a) \(\frac{1-\sin \phi}{1+\sin \phi}\)(b) \(\frac{1+\sin \phi}{1-\sin \phi}\)(c) \(\frac{1-\cos \phi}{1+\cos \phi}\)(d) \(\frac{1-\sin \phi}{1+\cos \phi}\)
The efficiency of a screw jack is maximum when(a) \(\alpha=\frac{\pi}{4}-\frac{\phi}{2}\)(b) \(\alpha=\frac{\pi}{4}+\frac{\phi}{2}\)(c) \(\frac{\pi}{2}-\frac{\phi}{2}\)(d)
For a self-locking screw, efficiency should be(a) \(50 \%\)(c) \(=50 \%\)(d) \(\geq 50 \%\)
For a flat pivot bearing of radii \(r_{1}\) and \(r_{2}\), the mean radius with uniform pressure is(a) \(\frac{1}{2}\left(r_{1}+r_{2}\right)\)(b)
The effective coefficient of friction for V-threads of thread angle \(2 \beta\) is(a) \(\mu \sin \beta\)(b) \(\frac{\mu}{\sin \beta}\)(c) \(\mu \cos \beta\)(d) \(\frac{\mu}{\cos \beta}\)
An effort of \(1 \mathrm{kN}\) is required to move a certain body up an inclined plane of angle \(15^{\circ}\) when the force is acting parallel to the plane. If the angle of plane is increased to
A shaft has a number of collars integral with it. The outer diameter of the collars is \(450 \mathrm{~mm}\) and the shaft diameter is \(300 \mathrm{~mm}\). If the uniform intensity of pressure is
A thrust shaft of a ship has six collars of \(600 \mathrm{~mm}\) outer diameter and \(300 \mathrm{~mm}\) inner diameter. The total thrust from the propeller is \(120 \mathrm{kN}\). If the coefficient
The mean diameter of a bolt having \(V\)-threads is \(25 \mathrm{~mm}\). The pitch of the threads is \(5 \mathrm{~mm}\) and the angle of threads is \(55^{\circ}\). The bolt is tightened by screwing a
A vertical screw with single-start square threads \(50 \mathrm{~mm}\) mean diameter and \(10 \mathrm{~mm}\) pitch is raised against a load of \(6 \mathrm{kN}\) by means of a hand wheel, the boss of
The pitch of a \(50 \mathrm{~mm}\) mean diameter threaded screw of a jack is \(12.5 \mathrm{~mm}\). The coefficient of friction between the screw and the nut is 0.15 . Determine the torque required
State the law of belting.
What is the effect of belt thickness and slip on speed ratio?
What is the effect of centrifugal tension on power transmission?
What is the role of initial tension in flat belt drive?
Write the expression for ratio of belt tensions.
What is centrifugal tension in a belt?
What is the condition for maximum power transmission by a belt?
What is belt creep?
Why crowning of pulley is done?
What is virtual coefficient of friction in a V-belt drive?
Define chain pitch.
When rope drive is preferred?
When chain drive is preferred?
When V-belt drive is preferred?
The centrifugal tension in belts(a) reduces power transmission(b) increases power transmission(c) does not affect power transmission(d) increases or decreases power transmission depending on speed.
In case of a flat belt drive with \(T\) as the maximum permissible tension, \(v\) as linear speed of belt, \(w\) as weight per metre length of belt, the maximum permissible speed is given by(a) \(T=w
With the same set of pulleys, belt and centre distance, the maximum power transmitted by(a) cross belt is more than open belt(b) cross belt is less than open belt(c) cross and open belts is same(d)
The ratio of tensions in the tight and slack sides of a belt drive is(a) \(\mu \theta\)(b) \(\exp (\mu \theta)\)(c) \(1 / \mu \theta\)(d) \(\exp (1 / \mu \theta)\).
If the percentage slip is same on both the driving and driven pulleys, then the speed ratio will(a) increase(b) decrease(c) remain same(d) unpredictable.
The crowning of pulleys is done to(a) make the belt run in the centre of the pulley face width(b) strengthen the pulley(c) give better shape to pulley(d) decrease slip.
Considering centrifugal tension in a belt, the maximum linear velocity of belt is proportional to(a) cube root of maximum tension(b) square root of maximum tension(c) maximum tension(d) reciprocal of
If the initial tension in the belt is increased then the power transmitted by the belt(a) reduces(b) increases(c) remains same(d) depends on speed.
The initial tension in the belt due to centrifugal tension, for the same power to be transmitted(a) increases(b) decreases(c) remains same(d) depends on speed.
The maximum tension in the belt, for limiting friction conditions, occurs at(a) starting(b) stopping(c) maximum power speed(d) specified speed.
The apparent coefficient of friction for V-belts is(a) \(\mu / \cos \beta\)(b) \(\mu \cos \beta\)(c) \(\mu \sin \beta\)(d) \(\mu / \sin \beta\).where \(\beta=\) semi-angle of pulley groove.
For maximum power to be transmitted by belt drive, the ratio of centrifugal tension to permissible tension is(a) \(1 / 2\)(b) \(1 / 3\)(c) \(2 / 3\)(d) \(1 / 4\).
For maximum power to be transmitted by belt drive, the ratio of centrifugal tension to effective tight side tension is(a) \(1 / 2\)(b) \(1 / 3\)(c) \(2 / 3\)(d) \(1 / 4\).
If the ratio of the tensions on tight and slack sides of a belt drive is increased by \(20 \%\), the power is(a) increased by \(20 \%\)(b) decreased by \(20 \%\)(c) unaffected(d) unpredictable.

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