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SSC JE 2019 - 20 Theory of Machine Part 8
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Question 1
The instantaneous centre of a rigid thin disc rolling on a plane rigid surface is located at
Question 2
A helicopter propeller rotates in counter-clockwise direction when seen from the top about the vertical axis. The helicopter takes a left turn in the horizontal plane about the vertical axis. The effect of gyroscopic couple will be
Question 3
A four cylinder 4 stroke inline engine is not balanced for what kind of forces/couples?
Question 4
In a kinematic chain, a quaternary joint is equivalent to________.
Question 5
For the vibratory system shown in the given figure, the equivalent stiffness of vibration in N/m is
Question 6
For a four-bar linkage in toggle position, the mechanical advantage is ________.
Question 7
The speed of an engine varies from ω1 to ω2.(ω1 >ω2) If ω1 = 210 rad/s & change in kinetic energy during cycle is 650 Nm. then find ω2 if inertia of the flywheel is 0.2 kg-m2.
Question 8
A gear train is made up of five spur gears as shown in the figure. Gear 2 is driver and gear 6 is driven member. N2. N3, N4. N5 and N6 represent number of teeth on gears 2, 3, 4, 5, and 6 respectively. The gear(s) which act(s) as idler(s) is/are
Question 9
Gyroscopic acceleration is due to
Question 10
A spring mass system has natural frequency 80 rad/s. What is the damping ratio required if it is desired to reduce this frequency to 40rad/s by adding damper to it?
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