Q.1
When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to
Q.2
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become
Q.3
Which of the following is a pendulum type governor?
Q.4
The secondary unbalanced force is __________ the primary unbalanced force.
Q.5
The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is
Q.6
It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by
Q.7
A shaft carrying two rotors at its ends will have
Q.8
In under damped vibrating system, the amplitude of vibration
Q.9
Kinematic pairs are those which have two elements that
Q.10
In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called
Q.11
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then
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Q.12
The Ackermann steering mechanism is preferred to the Davis type in automobiles because
Q.13
When the axes of the first and last wheels are coaxial, then the train is known as
Q.14
Tangential acceleration direction is
Q.15
A completely constrained motion can be transmitted with.
Q.16
The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.
Q.17
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)
Q.18
The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and δ = Static deflection of the body)
Q.19
Which of the following is a spring controlled governor?
Q.20
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.
Q.21
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.
Q.22
A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)
Q.23
Throw of a cam is the maximum distance of the follower from
Q.24
The height of a Watt's governor (in meters) is equal to (where N = Speed of the arm and ball about the spindle axis)
Q.25
Oldham’s coupling is an inversion of the kinematic chain used in
Q.26
What is the number of instantaneous centers for an eight link mechanism?
Q.27
A Porter governor is a
Q.28
Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of a cross belt drive. The length of the belt is
Q.29
Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is
Q.30
Transmission angle is the angle between
Q.31
In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.
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Q.32
A rotor supported at A and B carries two masses as shown in the below figure. The rotor is
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Q.33
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other.
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Q.34
In multi V-belt transmission, if one of the belt is broken, we have to change the
Q.35
The pressure angle of a cam depends upon
Q.36
The size of cam depends upon
Q.37
The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
Q.38
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
Q.39
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
Q.40
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in
Q.41
The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is
Q.42
Crowning on pulleys helps
Q.43
The purpose of a link is to
Q.44
In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from
Q.45
In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
Q.46
The angle of inclination of the plane, at which the body begins to move down the plane is called
Q.47
The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
Q.48
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)
Q.49
The maximum fluctuation of energy is the
Q.50
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)
0 h : 0 m : 1 s