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The axis of precession is __________ to the plane in which the axis of spin is going to rotate.

A. Parallel

B. Perpendicular

C. Both A and B

D. None of these

Correct Answer :

B. Perpendicular


Related Questions

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The motion between a pair which takes place in __________ is known as incompletely constrained motion.

A. One direction only

B. Two directions only

C. More than one direction

D. None of these

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A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

A. a is +ve and b = 0

B. a = 0 and b is +ve

C. a is +ve and b is -ve

D. a is +ve and b is also +ve

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TJIE horse power transmitted by a belt is dependent upon

A. Tension on tight side of belt

B. Tension on slack side of belt

C. Radius of pulley

D. All of the above

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A universal joint is an example of

A. Higher pair

B. Lower pair

C. Rolling pair

D. Sliding pair

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For low and moderate speed engines, the cam follower should move with

A. Uniform velocity

B. Simple harmonic motion

C. Uniform acceleration and retardation

D. Cycloidal motion

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The type of gears used to connect two non parallel and non intersecting shafts is

A. Spur gear

B. Helical gear

C. Bevel gear

D. Spiral gear

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4

In S.H.M., acceleration is proportional to

A. Velocity

B. Displacement

C. Rate of change of velocity

D. All of the above

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In the two rotor system as shown in the below figure (I₁ < I₂), a node of vibration is situated

A. Between I₁, and I₂ but nearer I₁

B. Between I₁, and I₂ but nearer to I₂

C. Exactly in the middle of the shaft

D. Nearer to I₁ but outside

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Pitch point on a cam is

A. Any point on pitch curve

B. The point on cam pitch curve having the maximum pressure angle

C. Any point on pitch circle

D. The point on cam pitch curve having the minimum pressure angle

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The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is

A. h/(kG² + h²)

B. (kG² + h²)/h

C. h²/(kG² + h²)

D. (kG² + h²)/h²

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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

A. Acceleration and velocity of the piston P is zero

B. Acceleration and velocity of the piston P is maximum

C. Acceleration of the piston P is zero and its velocity is maximum

D. Acceleration of the piston P is maximum and its velocity is zero

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4

In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

A. 10°-15°

B. 15°-25°

C. 25°-30°

D. 30°-40°

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The coriolis component of acceleration is taken into account for

A. Slider crank mechanism

B. Four bar chain mechanism

C. Quick return motion mechanism

D. All of these

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The cam and follower is an example of

A. Sliding pair

B. Rolling pair

C. Lower pair

D. Higher pair

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In elliptical trammels

A. All four pairs are turning

B. Three pairs turning and one pair sliding

C. Two pairs turning and two pairs sliding

D. One pair turning and three pairs sliding

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Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?

A. Theory of machines

B. Applied mechanics

C. Mechanisms

D. Kinetics

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The frequency of oscillation of a compound pendulum is

A. 2π. √[gh/(kG² + h²)]

B. 2π. √[(kG² + h²)/gh]

C. (1/2π). √[gh/(kG² + h²)]

D. (1/2π). √[(kG² + h²)/gh]

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If the damping factor for a vibrating system is unity, then the system will be

A. Over damped

B. Under damped

C. Critically damped

D. Without vibrations

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To connect two parallel and coplanar shafts the following type of gearing is used

A. Spur gear

B. Bevel gear

C. Spiral gear

D. None of the above

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In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as

A. Critical damping ratio

B. Damping factor

C. Logarithmic decrement

D. Magnification factor

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4

ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is

A. v

B. (2/3). v

C. (3/2). v

D. (9/4). v

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A kinematic chain is known as a mechanism when

A. None of the links is fixed

B. One of the links is fixed

C. Two of the links are fixed

D. None of these

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Shaft revolving in a bearing is the following type of pair

A. Lower pair

B. Higher pair

C. Spherical pair

D. Cylindrical pair

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The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

A. To dip the nose and tail

B. To raise the nose and tail

C. To raise the nose and dip the tail

D. To dip the nose and raise the tail

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The mechanism consisting of three turning pairs and one sliding pair, is called a

A. Single slider crank chain

B. Whitworth quick return motion mechanism

C. Crank and slotted lever quick return motion mechanism

D. All of the above

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4

In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

A. Equal to sum of other two

B. Greater than sum of other two

C. Less than sum of other two

D. There is no such relationship

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A cam mechanism imparts following motion

A. Rotating

B. Oscillating

C. Reciprocating

D. All of the above

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For an involute gear, the ratio of base circle radius and pitch circle radius is equal to

A. sinφ

B. cosφ

C. secφ

D. cosecφ

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The relation between number of links (l) and number of joints (j) in a kinematic chain is

A. l = (1/2).(j + 2)

B. l = (2/3).(j + 2)

C. l = (3/4).(j + 3)

D. l = j + 4

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The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

A. (1/2) μ W R

B. (2/3) μ W R

C. (3/4) μ W R

D. μ W R