ISRO 2018 Theory of Machines & Vibration Booster Quiz 3

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Question 1

In the figure shown below, the relative velocity of link 1 with respect to link 2 is 15 m/s. The link 2 rotates at a constant sped of 150 rpm. The magnitude of coriolis component of acceleration of link 1 is .....

• A201
• B239
• C418
• D471

Question 2

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the later at the same speed will be

• AFour times the first one
• BSame as the first one
• COne fourth of the first one
• DOne and a half times the first one

Question 3

A system of masses rotating in different parallel planes in dynamic balance if –

• AResultant force is zero
• BResultant couple is zero
• CResultant force is numerically equal to resultant coupe
• DResultant force and the resultant couple, both are equal to zero

Question 4

With symbols having the usual meanings, the single degree of freedom system, represents

• AFree vibrations with damping
• BFree vibrations without damping
• CForced vibrations with damping
• DForced vibrations without damping

Question 5

Angle of dwell of cam is defined as the angle

• ADuring which of the follower returns to its initial position
• BOf rotation of the cam for definite displacement of the follower
• CThrough which the cam rotates during the period in which the follower remains stationary
• DMoved by the cam from the instant the follower begins to rise, till it reaches the highest position

Question 6

A block of mass ‘m’ is connected to two springs of stiffness K₁ and K₂ as shown in the figure f₁and f₂ are the frequencies of the block when connected to K₁ and K₂ independently. Then the frequency of ‘m’ when connected to K₁ and K₂ as in the figure is

• A
• B
• C
• D

Question 7

Sensitiveness of a governor is

• AThe ratio of the difference between the maximum and minimum speed to the mean speed
• BThe ratio of the maximum speed to minimum speed to minimum speed within the operating range
• CThe ratio of the difference between the maximum and mean speed to that of minimum to mean speed
• DThe range of variation of engine speed

Question 8

At node of the shaft

• AThe vibrations are minimum
• BThe vibrations are maximum
• CThe vibrations are average
• DThe vibrations are zero

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