Q. The natural frequency (in Hz) of free longitudinal vibrations is equal to
β
Correct Answer: (D)
all of the mentioned
Dynamics of Machines MCQs | Page - 5
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Q. The factor which affects the critical speed of a shaft is
β
Correct Answer: (D)
all of the mentioned
Q. In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to
β
Correct Answer: (B)
log (x1/x2)
Q. The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
β
Correct Answer: (D)
magnification factor
Q. Which of the following systems produce a vibration in the foundation?
β
Correct Answer: (A)
unbalanced machine
Q. When a periodic disturbing force is applied to a machine, the force is transmitted to the foundation by the means of spring.
β
Correct Answer: (A)
true
Q. Which of the following is a type of transmitted force to the foundation?
β
Correct Answer: (A)
damping force
Q. If isolation factor is negative, then what is the phase difference between transmitted and disturbing force?
β
Correct Answer: (A)
180°
Q. In latitude 25.0 S, SA (spin axis) of a FG (free gyro) is in position S40E and horizontal. Find the tilt after 6 hours.
β
Correct Answer: (A)
61.16 up
Q. The steering of a ship means
β
Correct Answer: (B)
turning of a complete ship in a curve towards right r left, while it moves forward
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