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4

A reed type tachometer use the principle of

A. Longitudinal vibration

B. Torsional vibration

C. Transverse vibration

D. Damped free vibration

Correct Answer :

C. Transverse vibration


Related Questions

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4

Which of the following would constitute a link?

A. Piston, piston rod and cross head

B. Piston and piston rod

C. Piston rod and cross head

D. Piston, crank pin and crank shaft

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4

Longitudinal vibrations are said to occur when the particles of a body moves

A. Perpendicular to its axis

B. Parallel to its axis

C. In a circle about its axis

D. None of these

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4

The ratio of the driving tensions for V-belts is __________ times that of flat belts. (Where β = Semi-angle of the groove)

A. sinβ

B. cosβ

C. cosecβ

D. secβ

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4

The angle of inclination of the plane, at which the body begins to move down the plane is called

A. Angle of friction

B. Angle of repose

C. Angle of projection

D. None of these

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4

Maximum fluctuation of energy in a flywheel is equal to [where I = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, CS = Coefficient of fluctuation of speed, and ω = Mean angular speed = (ω₁ + ω₂)/2]

A. I.ω.(ω₁ - ω₂)

B. I.ω².CS

C. 2.E.CS

D. All of these

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4

The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.

A. Less

B. More

C. Same

D. None of these

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4

For the brake to be self locking, the force P at C shown in the below figure, should

A. Be zero

B. Act in upward direction

C. Act in downward direction

D. None of these

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4

Lower pairs are those which have

A. Point or line contact between the two elements when in motion

B. Surface contact between the two elements when in motion

C. Elements of pairs not held together mechanically

D. Two elements that permit relative motion

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4

Angle of action of cam is defined as the angle

A. Of rotation of the cam for a definite displacement of the follower

B. Through which the cam rotates during the period in which the follower remains in the highest position

C. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

D. Moved by the cam from beginning of ascent to the termination of descent

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4

Cam size depends upon

A. Base circle

B. Pitch circle

C. Prime circle

D. Outer circle

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4

The size of cam depends upon

A. Base circle

B. Pitch circle

C. Prime circle

D. Pitch curve

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4

A watt's governor can work satisfactorily at speeds from

A. 60 to 80 r.p.m.

B. 80 to 100 r.p.m.

C. 100 to 200 r.p.m.

D. 200 to 300 r.p.m.

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4

The unbalanced force due to revolving masses

A. Varies in magnitude but constant in direction

B. Varies in direction but constant in magnitude

C. Varies in magnitude and direction both

D. Constant in magnitude and direction both

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4

In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

A. Less than unity

B. Equal to unity

C. Greater than unity

D. Zero

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4

Sense of tangential acceleration of a link

A. Is same as that of velocity

B. Is opposite to that of velocity

C. Could be either same or opposite to velocity

D. Is perpendicular to that of velocity

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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

Which of the following is a lower pair?

A. Ball and socket i

B. Piston and cylinder

C. Cam and follower

D. Both (A) and (B) above

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4

For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a

A. 30° V-engine

B. 60° V-engine

C. 120° V-engine

D. 150° V-engine

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4

The height of a Watt's governor (in metres) is equal to (where N = Speed of the arm and ball about the spindle axis)

A. 8.95/N²

B. 89.5/N²

C. 895/N²

D. 8950/N²

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4

The swaying couple is due to the

A. Primary unbalanced force

B. Secondary unbalanced force

C. Two cylinders of locomotive

D. Partial balancing

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4

Which of the following is an open pair?

A. Ball and socket joint

B. Journal bearing

C. Lead screw and nut

D. Cam and follower

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4

In a steam engine, the link constitutes a

A. Piston, piston rod and crosshead

B. Connecting rod with big and small end brasses, caps and bolts

C. Crank pin, crankshaft and flywheel

D. All of the above

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4

The train value of a gear train is

A. Equal to velocity ratio of a gear train

B. Reciprocal of velocity ratio of a gear train

C. Always greater than unity

D. Always less than unity

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4

Ackermann steering gear consists of

A. Sliding pairs

B. Turning pairs

C. Rolling pairs

D. Higher pairs

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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

A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis

A. At the origin

B. Below the origin

C. Above the origin

D. Any one of these

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4

The example of lower pair is

A. Shaft revolving in a bearing

B. Straight line motion mechanisms

C. Automobile steering gear

D. All of the above

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4

When the axes of the first and last wheels are coaxial, then the train is known as

A. Simple train of wheels

B. Compound train of wheels

C. Reverted gear train

D. Epicyclic gear train

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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

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be

A. Four times the first one

B. Same as the first one

C. One fourth of the first one

D. One and a half times the first one