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ESE ME 2018 Achiever Study Plan: Theory of Machines Quiz 4
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Question 1
A uniform bar, fixed at one end carries a heavy concentrated mass at the other end. The system is executing longitudinal vibrations. The inertia of the bar may be taken into account by which one of the following portions of the mass of the bar at the free end?
Question 2
With respect to the epicyclic gear train shown in the figure below, A has 75 teeth and B has 25 teeth; A is fixed and arm C makes 5
revolutions:
The number of revolutions made by B is
revolutions:
The number of revolutions made by B is
Question 3
In a crank and slotted lever quick return motion mechanism, the length of the fixed link is 160 mm and the driving crank is 80 mm long. The ratio of time taken by cutting and return strokes is
Question 4
Consider the following statements:
1) In stationary constant speed engines, the spring-loaded governor mechanism is fitted on the cam-shaft of the engine.
2) Hunting occurs when the governor is not sensitive.
3) Isochronous governors have the same speed over a wide range of governor action.
4) A governor is said to be unstable if the radius of rotation falls as the speed increases.
Which of the above statements are correct?
1) In stationary constant speed engines, the spring-loaded governor mechanism is fitted on the cam-shaft of the engine.
2) Hunting occurs when the governor is not sensitive.
3) Isochronous governors have the same speed over a wide range of governor action.
4) A governor is said to be unstable if the radius of rotation falls as the speed increases.
Which of the above statements are correct?
Question 5
Two links are shown in Coriolis component figure where first link speed with respect to second link speed is 15 m/sec. If second link rotates at fixed speed of 80 rpm, then find magnitude of Coriolis component of acceleration of first link?
Question 6
Total number of instantaneous centers of rotation for a mechanism having n links is
Question 7
What is the maximum acceleration of a cam follower undergoing simple harmonic motion?
Question 8
A rotor weighing 2 kN is supported on bearings A and B which are 1 m apart. The centre of mass of the rotor is at a distance 0.4 m from bearing A. It is observed that there is an unbalanced couple of magnitude 300 N-m which leaves the shaft balanced statically. The
dynamic reactions at the supports will be
dynamic reactions at the supports will be
Question 9
What is the condition for dynamic balancing of a shaft-rotor system?
Question 10
Consider the following statements:
1) Lower pairs are more resistant than higher pairs in a plane mechanism.
2) In a 4-bar mechanism (with 4 turning pairs), when the link opposite to the shortest link is fixed, a double rocker mechanism results.
Which of these statements is/are correct?
1) Lower pairs are more resistant than higher pairs in a plane mechanism.
2) In a 4-bar mechanism (with 4 turning pairs), when the link opposite to the shortest link is fixed, a double rocker mechanism results.
Which of these statements is/are correct?
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