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What is the correct answer?

4

The number of links in pantograph mechanism is equal to

A. 2

B. 3

C. 4

D. 5

Correct Answer :

C. 4


Related Questions

What is the correct answer?

4

The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.

A. Zero

B. Minimum

C. Maximum

D. None of these

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4

The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

A. m.ω².r sinθ

B. m.ω².r cosθ

C. m.ω².r (sin 2θ/n)

D. m.ω².r (cos 2θ/n)

What is the correct answer?

4

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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4

Cylindrical cams can be classified as

A. Circular

B. Tangent

C. Reciprocating

D. None of the above

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4

When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

A. Free vibration

B. Forced vibration

C. Damped vibration

D. Under damped vibration

What is the correct answer?

4

For high speed engines, the cam follower should move with

A. Uniform velocity

B. Simple harmonic motion

C. Uniform acceleration and retardation

D. Cycloidal motion

What is the correct answer?

4

One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)

A. 2π. √(g/δ)

B. 1/2π. √(g/δ)

C. 2π. √(δ/g)

D. 1/2π. √(δ/g)

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4

The Hooke's joint consists of:

A. Two forks

B. One fork

C. Three forks

D. Four forks

What is the correct answer?

4

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

A. fn/2

B. 2 fn

C. 4 fn

D. 8 fn

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4

The pair is known as a higher pair, when the relative motion between the elements of a pair is

A. Turning only

B. Sliding only

C. Rolling only

D. Partly turning and partly sliding

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4

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

A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

A. G.I₂

B. G².I₂

C. I₂/G

D. I₂/G²

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4

The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as

A. Completely constrained motion

B. Incompletely constrained motion

C. Successfully constrained motion

D. None of these

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4

The absolute acceleration of any point P in a link about center of rotation O is

A. Along PO

B. Perpendicular to PO

C. At 45° to PO

D. None of the above

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4

A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal forc

A. The reaction on me inner wheels increases and on the outer wheels decreases

B. The reaction on the outer wheels increases and on the inner wheels decreases

C. The reaction on the front wheels increases and on the rear wheels decreases

D. The reaction on the rear wheels increases and on the front wheels decreases

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4

Effort of a governor is the

A. Mean force exerted at the sleeve for a given percentage change of speed

B. Workdone at the sleeve for maximum equilibrium speed

C. Mean force exerted at the sleeve for maximum equilibrium speed

D. None of the above

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4

The critical speed of a shaft depends upon its

A. Mass

B. Stiffness

C. Mass and stiffness

D. Stiffness and eccentricity

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4

The unbalanced primary forces in a reciprocating engine are

A. Balanced completely

B. Balanced partially

C. Balanced by secondary forces

D. Not balanced

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4

A Hartnell governor is a

A. Dead weight governor

B. Pendulum type governor

C. Spring loaded governor

D. Inertia governor

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4

Which of the following statement is wrong?

A. A round bar in a round hole form a turning pair

B. A square bar in a square hole form a sliding pair

C. A vertical shaft in a foot step bearing forms a successful constraint

D. All of the above

What is the correct answer?

4

Whirling speed of the shaft is the speed at which

A. Shaft tends to vibrate in longitudinal direction

B. Torsional vibrations occur

C. Shaft tends to vibrate vigorously in transverse direction

D. Combination of transverse and longitudinal vibration occurs

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4

A spring controlled governor is found unstable. It can be made stable by

A. Increasing the spring stiffness

B. Decreasing the spring stiffness

C. Increasing the ball mass

D. Decreasing the ball mass

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4

A pulley and belt in a belt drive form a

A. Cylindrical pair

B. Turning pair

C. Rolling pair

D. Sliding pair

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4

A governor is said to be stable, if the

A. Radius of rotation of balls increases as the equilibrium speed decreases

B. Radius of rotation of balls decreases as the equilibrium speed decreases

C. Radius of rotation of balls increases as the equilibrium speed increases

D. Radius of rotation of balls decreases as the equilibrium speed increases

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4

A pantograph is a mechanism with

A. Lower pairs

B. Higher pairs

C. Rolling pairs

D. Turning pairs

What is the correct answer?

4

A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

A. 2 W CE / CS

B. W CE / 2CS

C. W CE / CS

D. W CS / 2CE

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4

The two elements of a pair are said to form a _________ when they permit relative motion between them.

A. Open pair

B. Kinematic pair

C. Sliding pair

D. None of these

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4

In a gear having involute teeth, the normal to the involute is a tangent to the

A. Pitch circle

B. Base circle

C. Addendum circle

D. Dedendum circle

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4

In an ideal machine, the output as compared to input is

A. Less

B. More

C. Equal

D. May be less or more depending on efficiency

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4

The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is

A. Flexible coupling

B. Universal coupling

C. Chain coupling

D. Oldham's coupling