ISRO 2018 Theory of Machines & Vibration Booster Quiz 4

Attempt now to get your rank among 1117 students!

Question 1

In the viscous damped vibration, the logarithmic decrement value over five cycles is found to be 8.11. What is viscous damping factor of vibratory system?

• A20%
• B25%
• C30%
• D15%

Question 2

A vehicle suspension system consists of a leaf spring and a damper. The stiffness of the leaf spring is 3.6 KN/m and damping constant of the damper is 400 Ns/m. If the mass is 50 Kg, then the damping factor and damped natural frequency respectively are

• A0.471 and 1.19 rad/sec
• B0.471 and 7.48 rad/sec
• C0.666 and 1.35 rad/sec
• D0.666 and 8.50 rad/sec

Question 3

A rotating dise of 1m diameter has two eccentric masses of 0.5 kg each at radi of 50 mm and 60 mm at angular position of 0 ° and 150 °, respectively. A balancing mass of 0.1 Kg is to be used to balance the rotor. What is the radial position of balancing mass?

• A50 mm
• B120 mm
• C150 mm
• D280 mm

Question 4

A shaft has two heavy rotors mounted on it. The transverse natural frequency considering each rotor separately is 100 hz & 200 hz respectively. The lowest critical speed is

• A13000 rpm
• B5367 rpm
• C6450 rpm
• D9343 rpm

Question 5

Planetary gear is in contact with the fixed gear as shown in the figure. The number of rotations made by the planetary gear for one rotation of the arm is _________.

• A3
• B4
• C1
• D1/3

Question 6

The number of degrees of freedom for the following mechanism is

• A0
• B1
• C2
• D4

Question 7

In simple harmonic motion the acceleration is proportional to

• ADisplacement
• BLinear velocity
• CAngular velocity
• DRate of angular velocity

Question 8

Two satellites, of masses m and 2m, are on the same circular orbit around earth. If the velocity of the lighter satellite is v₀, what is the velocity of the heavier satellite?

• A
• B
• C
• D

• 1117 attempts
• 1 upvote
• 8 comments