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engineering
machine elements in mechanical design
Questions and Answers of
Machine Elements In Mechanical Design
The fly balls of spring loaded governor of Hartnell type running at 600 rpm have a radius of rotation of 80 mm with sleeve in mid-position and ball arms vertical. The ball arms and sleeve arms are of
The height of Watt's governor is proportional to(a) speed (N)(b) \(\mathrm{N}^{2}\)(c) \(1 / \mathrm{N}\)(d) \(1 / \mathrm{N}^{2}\).
What is the main function of a governor? How does it differ from that of a flywheel?
A Porter governor has all the four arms of 250 mm length each. All the upper arms and the sleeve arms are pivoted on the axis of rotation. The mass of each governor ball is 0.9 kg. The mass on the
The lengths of upper and lower arms of a Porter governor are 220 mm and 260 mm respectively.All the arms are pivoted on the axis of rotation. The central load is 125 N and weight of each ball is 15
In a Hartnell governor, if the stiffness of spring is increased, the governor will(a) become more sensitive(b) become less sensitive(c) remain unaffected(d) start hunting.
What are the various types of governors?
A Porter governor has all four arms 200 mm long. The upper arms are attached on the axis of rotation and the lower arms are attached to the sleeve at a distance of 25 mm from the axis. The mass of
The function of a governor is to(a) reduce the speed fluctuations during a cycle(b) maintain the prime mover speed within prescribed limits(c) not to influence the speed of the prime mover(d) not to
How does centrifugal governor differ from an inertia governor?
A loaded Porter governor has four arms each 240 mm long, two revolving masses each weighing 25 N and a central dead weight of 200 N. All the arms are attached to respective sleeves at radial
The following governor is spring loaded(a) Watt governor(b) Porter governor(c) Proell governor(d) Hartnell governor.
What is the effect of friction on the functioning of a Porter governor?
In a Proell governor, the mass of each ball is 5 kg and central load on sleeve is 50 kg. The length of each upper and lower arms is 250 mm. The minimum and maximum radii are 120 mm and 180 mm
The gravity controlled governor is(a) Hartnell governor(b) Pickering governor(c) Hartung governor(d) Proell governor.
Why an auxiliary spring is used along with main springs in a Wilson-Hartnell governor?
The arms of a Proell governor are 250 mm long. The upper arms are pivoted on the axis of rotation, while the lower arms are pivoted at a radius of 35 mm. Mass of each ball is 5 kg and is fixed to the
The height of a Watt's governor is(a) \(\omega^{2} / g\)(b) \(g / \omega^{2}\)(c) \(g \omega^{2}\)(d) \(2 g \omega^{2}\)
Which type of governor is used in a gramophone?
The Proell governor as compared to Porter governor, at same speed(a) is more sensitive(b) requires smaller size(c) has less lift(d) all of the above.
Explain the meaning of sensitiveness, hunting and stability of a governor?
In a Hartnell type governor, the two masses are 5 kg each and the load on the sleeve is 45 kg.With the mass arms vertical, the path radius is 80 mm and the equilibrium speed, neglecting friction, is
The sensitivity of a governor due to frictional resistance at the sleeve(a) increases(b) decreases(c) remains same(d) depends on speed.
What is the condition of isochronism in case of a Hartnell governor?
In Hartnell governor, the lengths of ball and sleeve arms of a bell crank lever are 120 mm and 100 mm respectively. The distance of the fulcrum of the bell crank lever from the governor axis is 150
The spring loaded governors as compared to gravity controlled governors(a) can operate at higher speeds(b) are more compact and smaller in size(c) are capable of being fixed at any inclination(d) all
Define effort and power of a governor.
In a Wilson-Hartnell spring loaded governor, the two balls are of 5 kg each, which are connected by two springs. The speed of the governor is 600 rpm in its mean position. The radius of the governor
If the ball masses of a governor occupy a definite specified position for each speed, it is said to be(a) stable(b) hunting(c) isochronous(d) sensitive.
What is the controlling force of a governor? How does the controlling force curve help in establishing the stability or instability of a governor?
In a spring-controlled governor, the curve of controlling force is a straight line. When balls of 8 kg mass each are 400 mm apart, the controlling force is 1 kN and when 200 mm apart is 560 N.At what
If the ball masses of a governor have same equilibrium speed for all the radii of rotation, it is said to be(a) stable(b) hunting(c) isochronous(d) sensitive.
The controlling force F in N and radius of rotation r in cm for a spring loaded governor are related by the expression: F = 3r - 8. The mass of each ball is 5 kg and extreme radii of rotation of the
Isochronous governor is(a) more sensitive(b) less stable(c) less sensitive(d) less stable.
The controlling force curve of a spring controlled governor is a straight line. The weight of each governor ball is 40 N and the extreme radii of rotation are 120 and 200 mm. The values of the
Governor effort is defined as the force applied for(a) \(1 \%\) change in speed(b) \(2 \%\) change in speed(c) \(5 \%\) change in speed(d) the total range of speed.
The following data refer to a Hartnell governor:Length of ball arm of bell crank lever = 150 mm; length of sleeve arm = 100 mm;Mass of ball = 5 kg; spring stiffness = 250 N/mm.At minimum speed of 300
Governor which is hunting is(a) more sensitive(b) less sensitive(c) more stable(d) less stable.
Governor power is defined as the product of governor effort and(a) sleeve lift(b) reciprocal of sleeve lift(c) difference of radii of rotation for maximum and minimum speeds(d) square of sleeve lift.
Define piston effort and crank effort.
The flywheel influences the(a) variation of load demand on prime mover(b) mean speed of the prime mover(c) cyclic variation in speed of the prime mover(d) mean torque developed by the prime mover.
A horizontal steam engine running at \(250 \mathrm{rpm}\) has a bore of \(210 \mathrm{~mm}\) and a stroke of \(350 \mathrm{~mm}\). The piston rod is \(20 \mathrm{~mm}\) in diameter and connecting rod
What do you mean by dynamically equivalent system?
If mean speed of the prime mover is increased then the coefficient of fluctuation of speed will(a) increase(b) decrease(c) remains same(d) unpredictable.
A single cylinder vertical engine has a bore of \(250 \mathrm{~mm}\) and a stroke of \(500 \mathrm{~mm}\). The connecting rod is \(1000 \mathrm{~mm}\) long. The mass of the reciprocating parts is
How do you account for the inertia of the connecting rod?
The maximum fluctuation of energy of flywheel is directly proportional to(a) coefficient of fluctuation of speed(b) square of angular speed of flywheel(c) moment of inertia of flywheel(d) all of the
In a reciprocating engine, the length of stroke is \(250 \mathrm{~mm}\) and connecting rod is \(500 \mathrm{~mm}\) long between centres. Determine:(a) the angular position of the crank,(b) velocity
What is a turning moment diagram? What are its advantages?
The acceleration of piston of a reciprocating engine is:(a) \(\omega^{2} r\left[\sin \theta+\frac{\cos 2 \theta}{n}\right]\)(b) \(\omega^{2} r\left[\cos \theta+\frac{\cos 2 \theta}{n}\right]\)(c)
The following data refer to a horizontal reciprocating engine:Mass of reciprocating parts \(=125 \mathrm{~kg}\), crank length \(=100 \mathrm{~mm}\), length of connecting rod between centres \(=500
Define coefficient of fluctuation of energy and coefficient fluctuation of speed.
Crank pin effort in a reciprocating engine is:(a) \(\frac{F \sin (\theta+\phi)}{\cos \phi}\)(b) \(\frac{F \sin (\theta+\phi)}{\sin \phi}\)(c) \(\frac{F \cos (\theta+\phi)}{\cos \phi}\)(d) \(\frac{F
The following data refer to a connecting rod of a reciprocating engine:Mass \(=60 \mathrm{~kg}\); Distance between bearing centres \(=900 \mathrm{~mm}\); Diameter of small end bearing \(=80\)
What is the main function of a flywheel?
Crank effort in a reciprocating engine is(a) \(F_{r}\left[\sin \theta+\frac{\sin 2 \theta}{2 n}\right]\)(b) \(F_{r}\left[\cos \theta+\frac{\cos 2 \theta}{2 n}\right]\)(c) \(F_{r}\left[\sin
A connecting rod of length \(400 \mathrm{~mm}\) between centres has a mass of \(4.5 \mathrm{~kg}\). The centre of gravity is \(260 \mathrm{~mm}\) from the small end and its radius of gyration about
Write the relationship between coefficient of fluctuation of speed, maximum fluctuation of energy and kinetic energy of flywheel.
Coefficient of fluctuation of speed is given by:(a) \(\frac{\omega_{\max }+\omega_{\min }}{\omega_{m}}\)(b) \(\frac{\omega_{\max }-\omega_{\min }}{\omega_{m}}\)(c) \(\frac{\omega_{\max }-\omega_{\min
The connecting rod of a vertical reciprocating engine is \(2 \mathrm{~m}\) long between centres and its mass is \(250 \mathrm{~kg}\). The mass centre is \(750 \mathrm{~mm}\) from the big end bearing.
Write the procedure for determining the turning moment diagram.
Fluctuation of energy of a flywheel is(a) \(C E\)(b) \(2 C_{s} E\)(c) \(\frac{1}{2} C_{s} E\)(d) \(4 C_{s} E\)
A single cylinder vertical engine has a bore of \(300 \mathrm{~mm}\), a stroke of \(350 \mathrm{~mm}\) and a connecting rod of length \(700 \mathrm{~mm}\). The weight of the reciprocating parts is
What is a compound pendulum?
The turning moment curve for one revolution of a multicylinder engine above and below the line of mean resisting torque are given by:\(-0.32,+4.06,-3.71,+3.29,-3.16,+3.32,-3.74,+3.71\), and \(-3.45
A constant torque \(3 \mathrm{~kW}\) motor drives a punching machine. The mass of the moving parts including the flywheel is \(130 \mathrm{~kg}\) at \(750 \mathrm{~mm}\) radius. One punching
State the conditions of static equilibrium.
The forces generally considered in the design of mechanisms are:(a) applied forces(b) inertia forces(c) frictional forces(d) all of them.
A four-bar mechanism shown in Fig. 11.32 is subjected to a force of \(2 \angle 60^{\circ} \mathrm{kN}\) of link \(\mathrm{CD}\). The dimensions of the various links are:\(A B=A D=300 \mathrm{~mm}, B
State the principle of superposition.
A pair of action and reaction forces acting on a body are called(a) applied forces(b) inertia forces(c) frictional forces(d) constraint forces.
A four-bar mechanism shown in Fig. 11.33 is subjected to a force as shown. The dimensions of the various links are:\(A B=C D=200 \mathrm{~mm}, B C=300 \mathrm{~mm}, A D=400 \mathrm{~mm}, C E=100
State the D’Alembert’s principle.
For the static equilibrium of planar mechanisms(a) \(\Sigma F_{x}=0\)b) \(\Sigma F_{y}=0\)(c) \(\Sigma M_{O}=0\)(d) all of the above.
A four-bar mechanism shown in Fig. 11.34 is subjected to torques \(T_{3}=50 \mathrm{Nm}\) and \(T_{4}=60 \mathrm{Nm}\). The dimensions of the various links are:\(A B=C D=400 \mathrm{~mm}, B C=800
What is equivalent offset inertia force?
If the resultant of forces acting on a body does not pass through the centre of mass, then the inertia force and inertia couple is replaced by(a) Equivalent inertia force(b) equivalent inertia
A slider crank mechanism is loaded as shown in Fig. \(11.35 . A B=400 \mathrm{~mm}, B C=600 \mathrm{~mm}, A D=200\) \(\mathrm{mm}, C E=300 \mathrm{~mm}\). Calculate the input torque for the static
What is inertia force?
The lengths of crank and connecting rod of a slider crank mechanism are \(40 \mathrm{~mm}\) and \(100 \mathrm{~mm}\), respectively. It is subjected to piston force of \(2000 \mathrm{~N}\). Determine
Which do you mean by a static force?
A four-bar mechanism is loaded as shown in Fig.11.36. \(A B=C D=300 \mathrm{~mm}\).\(B C=250 \mathrm{~mm}, A E=C G=150 \mathrm{~mm}, B F=100 \mathrm{~mm}, A D=500 \mathrm{~mm}\)Determine the
What is an applied force?
A slider-crank mechanism shown in Fig. 11.37 is subjected to piston load of \(1 \mathrm{kN}, A B=250 \mathrm{~mm}\), \(B C=600 \mathrm{~mm}\). Determine the input torque to link \(A B\) for the
State the conditions for the equilibrium of a body under the following system of loading.(a) Two forces,(b) three forces, and(c) two forces and a torque.
A slider-crank mechanism shown in Fig. 11.38 is subjected to piston load of \(3 \mathrm{kN}\) and a force \(1 \angle 45^{\circ} \mathrm{kN}\) or link \(\mathrm{BC}\).\(A B=300 \mathrm{~mm}, B C=750
A shaft carries four rotating masses A, B, C and D in this order along its axis. The mass A may be assumed concentrated at a radius of 120 mm, B at 150 mm, C at 130 mm, and D at 180 mm.The masses at
In case of reciprocating engines the ratio of primary to secondary forces is(a) \(\cos \theta / \cos 2 \theta\)(b) \(\cos \theta /(\mathrm{n} \cos 2 \theta)\)(c) \(n \cos \theta / \cos 2 \theta\)(d)
What is the necessity of balancing high speed machinery?
A shaft rotating at 1000 rpm carries two unbalances of magnitudes 0.2 kg m and 0.1 kg m in planes A and B respectively. The planes A and B are 0.5 m apart and the directions of the unbalances are at
Partial balancing in locomotives results in(a) hammer blow(b) variation in tractive effort(c) swaying couple(d) all of the above
What do you mean by static and dynamic balance of machinery
The cranks and connecting rods of a 4-cylinder in-line engine running at 1800 rpm are 50 mm and 200 mm long respectively. The cylinders are spaced 150 mm apart. If the cylinders are numbered 1 to 4
In reciprocating engines, primary forces are(a) completely balanced(b) partially balanced(c) can not be balanced(d) balanced by secondary forces.
What do you mean by primary and secondary unbalance in reciprocating engines?
A four-crank engine has the two outer cranks set at 120° to each other, and their reciprocating masses are each 400 kg. The distance between the planes of rotation of adjacent cranks are 0.5, 0.8
In case of locomotives, the effect of hammer blow is counteracted by(a) flanges of the tyres of the wheels(b) balancing weights(c) inside section of the rails(d) dead weight of the engine.
What is partial balancing of reciprocating engines?
A rotating shaft carries four unbalanced masses 20, 15, 18 and 10 kg at radii 50, 60, 70 and 65 mm, respectively. The 2nd, 3rd and 4th masses revolve in planes 80, 150 and 300 mm respectively
Hammer blow in locomotives results in(a) pulsating torque(b) tendency to lift wheels from rails.(c) uneven speed(d) variable horizontal force.
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