The equation of motion for a single degree of freedom system with viscous damping is given below in which, the damping ratio of the system is
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Correct Answer:
9/16
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When there is a reduction in amplitude over every cycle of vibration, then the body is said to have
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Correct Answer:
Damped vibration
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At the nodal point in a shaft, the amplitude for torsional vibration will be
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Correct Answer:
Zero
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A shaft carrying three rotors will have
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Two nodes
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Frequency of vibrations is usually expressed in
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Correct Answer:
Number of cycles per second
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A single degree of freedom system is given by the following equation with usual notations. It represents:
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Correct Answer:
Forced vibration with damping
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Critical damping is a function of
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Correct Answer:
Mass and stiffness
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If the damping factor for a vibrating system is unity, then the system will be
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Correct Answer:
Critically damped
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Longitudinal vibrations are said to occur when the particles of a body moves
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Correct Answer:
Parallel to its axis
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When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
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Correct Answer:
Compound pendulum
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In order to double the period of a simple pendulum, the length of the string should be
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Quadrupled
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In under damped vibrating system, the amplitude of vibration
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Correct Answer:
Decreases exponentially with time
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The ratio of the actual damping coefficient to the critical damping coefficient is called.
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Correct Answer:
Damping factor
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The amplitude of vibration is always the radius of the circle.
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Correct Answer:
Equal to
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In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is
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Correct Answer:
180°
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The critical speed of a shaft in revolution per second is as that of natural frequency of transverse vibration.
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Correct Answer:
Same
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The periodic time is given by (where ω = Angular velocity of the particle in rad/s)
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Correct Answer:
2π/ω
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The periodic time of a compound pendulum is _ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity.
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Correct Answer:
Minimum
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The equation of free vibrations of a system is given below, Its natural frequency is,
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Correct Answer:
3 Hz
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The velocity of a body moving with simple harmonic motion is at the mean position.
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Correct Answer:
Maximum
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The equation of motion for a vibrating system with viscous damping is If the roots of this equation are real, then the system will be
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Correct Answer:
Overdamped
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The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
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Correct Answer:
Magnification factor
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The critical speed of a shaft depends upon its
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Mass and stiffness
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A shaft carrying two rotors at its ends will have
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One node
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When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will
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Oscillate with increasing time period
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When the particles of a body moves perpendicular to its axis, then the body is said to be,
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Transverse vibration
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The maximum velocity of a particle moving with simple harmonic motion is
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Correct Answer:
ωr
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Torsional vibrations are said to occur when the particles of a body moves
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Correct Answer:
In a circle about its axis
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The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
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Correct Answer:
Magnification factor
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The frequency of oscillation at compared to earth will be
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Correct Answer:
2.44 times less
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A reed type tachometer use the principle of
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Transverse vibration
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The stress induced in a body will be shear stress, when it is subjected to
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Correct Answer:
Torsional vibrations
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Which among the following is not considered when reference standards are used in the field of mechanical vibration and shock, monitoring and analysis of machines?
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Correct Answer:
None of the above
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Which basic document describes general requirements for measurement and evaluation of machine vibrations using shaft measurements?
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Correct Answer:
ISO – 7919-1
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Which of the following is a type of untuned vibration absorber?
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Correct Answer:
Houdaille damper
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Which of the following methods can be used to reduce excitation level at the source?
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Correct Answer:
Both a and b
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Which of the following conditions is/are to be satisfied by the seismometer for it to be used as velometer?
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Correct Answer:
It's natural frequency should be large
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Which of the following vibrometers have frequency ratio (ω/ωn) << 1?
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Correct Answer:
Accelerometers
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Which type of monitoring system uses stroboscope to measure speed of the machine?
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Correct Answer:
Basic condition monitoring system
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Seismometer can be used to measure acceleration of any instrument only if _____
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both a. and b.
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Which of the following statements is/are true?
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Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction
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Simulation is a process which _________
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Correct Answer:
Explores behavior of a model by varying input variables
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What is meant by geometric modeling?
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Correct Answer:
Both a and b
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Magnification factor is the ratio of ______
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Correct Answer:
Amplitude of steady state vibrations and zero frequency deflection
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Determine natural frequency of a system, which has equivalent spring stiffness of 30000 N/m and mass of 20 kg?
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Correct Answer:
6.16 Hz
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According to which method, maximum kinetic energy at mean position is equal to maximum potential energy at extreme position?
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Correct Answer:
Rayleigh's method
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What are deterministic vibrations?
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Correct Answer:
Vibrations caused due to unknown exciting force
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Which of the following vibrations are classified according to the magnitude of actuating force?
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Correct Answer:
Deterministic vibrations
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In which type of vibrations, amplitude of vibration goes on decreasing every cycle?
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Correct Answer:
Damped vibrations
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What are discrete parameter systems?
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Correct Answer:
Systems which have finite number of degree of freedom
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The unbalanced force caused due to reciprocating mass is given by the equation
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Correct Answer:
mrω2 cos θ + mrω2 (cos 2θ/n)
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Which of the following factors are not responsible for unbalancing in rotating systems?
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Correct Answer:
None of the above
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What is the name of the gear's diameter in millimeters?
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Correct Answer:
Pitch
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What is another name for gear ratio?
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Correct Answer:
Module
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What type of Pitch is the ratio of the number of teeth on the gear?
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Correct Answer:
Diametral
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What is the name of the number of teeth on the gear?
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Correct Answer:
Diametral Pitch
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What is the name of the theoretical circle that all calculations are based on?
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Correct Answer:
Pitch circle
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What is the name of a theoretical circle on which all calculations are based?
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Correct Answer:
Pitch circles
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What are the smaller gears often called?
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Correct Answer:
Pinion
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What other name is used to refer to the larger of the two mating gears?
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Correct Answer:
Gear or the wheel
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In what type of gears are the teeth straight and parallel to the axes of rotation?
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Correct Answer:
Spur gears
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How are the axes of the two shafts of spur gears?
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Correct Answer:
Parallel
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What can we do to find the maximum and minimum values of the pressure angle?
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Correct Answer:
Differentiate this equation
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What do gears usually do?
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Correct Answer:
Transmit rotary motion between two shafts
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What are machine elements used to transmit rotary motion between two shafts?
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Correct Answer:
Gears
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What does the third-order kinematic coefficient show the rate of change of?
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Correct Answer:
Y with respect to the input position theta
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What is the second-order kinematic coefficient?
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Correct Answer:
Curvature of the cam
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What is a second-order coefficient?
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Correct Answer:
Kinematic
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What is the second order coefficient related to?
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Correct Answer:
The curvature of the cam
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What is a measure of the "steepness" of the displacement diagram?
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Correct Answer:
First-order kinematic coefficient
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What does the first-order kinematic coefficient represent?
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Correct Answer:
The slope of the displacement diagram
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What are additional graphs that can be plotted representing the derivative of y with respect to the input position theta?
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Correct Answer:
Kinematic coefficients
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What is plotted as the ordinate regardless of the type of cam or the type of follower?
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Correct Answer:
The follower output motion y
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What is plotted with the input motion of a cam as the abscissa and the follower output motion as the ordinate?
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Correct Answer:
Displacement diagram
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Which axis is the smallest circle centered on?
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Correct Answer:
Cam rotation axis
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Where does the cam axis rotate?
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Correct Answer:
At the cam rotation axis
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Where does the pitch curve Locus get it's name from?
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Correct Answer:
The trace point
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What is the name of the curve that shows how a pitch moves across an octave?
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Correct Answer:
Pitch Curve Locus
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What is the point of a Trace Point?
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Correct Answer:
Theoretical point of the follower
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Where is the point of the follower?
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Correct Answer:
Trace Point
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What is the surface developed by holding the cam stationary?
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Correct Answer:
The cam surface
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What is the nomenclature for the follower that is being rotated?
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Correct Answer:
The cam surface
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What is the unit of measurement for abscissa?
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Correct Answer:
One cycle of the input motion theta
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To what scale is the abscissa of a displacement diagram drawn?
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Correct Answer:
Any convenient
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What is the abscissa usually drawn to?
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Correct Answer:
Any convenient scale
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What type of constraint do the two contact points provide?
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Correct Answer:
Constant-breadth
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What provides the constraint in a constant-breadth cam?
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Correct Answer:
Two contact points
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What is the most common type of follower?
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Correct Answer:
Reciprocating
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What is a machine element used to drive another element called?
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Correct Answer:
A follower
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In what medium is a machine element used to drive another element, called a follower?
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Correct Answer:
Cam
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What does the term jerk stand for in physics?
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Correct Answer:
Time derivative of acceleration
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What is the time derivative of acceleration?
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Correct Answer:
Jerk
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What rate of change do angular acceleration and angular velocity have in relation to each other?
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Correct Answer:
Time
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What is the time rate of change of an object's angular velocity?
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Correct Answer:
Acceleration
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What is the time rate of change of the angular velocity called?
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Correct Answer:
Angular acceleration
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What is the name of the rate of change of velocity?
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Correct Answer:
Instantaneous acceleration
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What is the time rate of change of velocity of an object when it is traveling at the speed of light?
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Correct Answer:
Instantaneous
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What does the Scotch yoke do to the rod?
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Correct Answer:
Has the effect of a connecting rod of infinite length
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What has the effect of a connecting rod of infinite length?
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Correct Answer:
Scotch yoke
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The second terms of the previous equations become what if the Scotch yoke is used?
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Correct Answer:
Zero
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What is the definition of the magnitude of the angular velocity?
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Correct Answer:
The time rate of change of the angular orientation of any line
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Magnitude of the angular velocity is defined as the time rate of change of the angular orientation of what?
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Correct Answer:
Line
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The angular velocity of a rotating body is now defined as a what?
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Correct Answer:
Vector quantity
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What type of quantity is omega?
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Correct Answer:
Vector
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For what is the instantaneous velocity of a moving object defined?
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Correct Answer:
The limit of this ratio for an infinitesimally small time interval
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What is the definition of instantaneous velocity?
Answer
Correct Answer:
Limit of this ratio
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