Home
Current Affairs January 2024

What is the correct answer?

4

If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the

A. 0.5

B. 1

C. 1.5

D. 2

Correct Answer :

B. 1


Related Questions

What is the correct answer?

4

Peaucelliers mechanism has

A. Eight links

B. Six links

C. Four links

D. Twelve links

What is the correct answer?

4

A kinematic chain requires at least

A. 2 links and 3 turning pairs

B. 3 links and 4 turning pairs

C. 4 links and 4 turning pairs

D. 5 links and 4 turning pairs

What is the correct answer?

4

The partial balancing means

A. Balancing partially revolving masses

B. Balancing partially reciprocating masses

C. Best balancing of engines

D. All of these

What is the correct answer?

4

A rigid body possesses ________degrees of freedom

A. One

B. Two

C. Four

D. Six

What is the correct answer?

4

Creep in belt drive is due to

A. Material of the pulley

B. Material of the belt

C. Larger size of the driver pulley

D. Uneven extensions and contractions due to varying tension

What is the correct answer?

4

When the sleeve of a Porter governor moves upwards, the governor speed

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

What is the correct answer?

4

The factional torque for square thread at the mean radius r while raising load W is given by

A. T = W.r tan(φ - α)

B. T = W.r tan(φ + α)

C. T = W.r tanα

D. T = W.r tanφ

What is the correct answer?

4

In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is

A.

B. 90°

C. 180°

D. 270°

What is the correct answer?

4

The approximate straight line mechanism is a

A. Four bar linkage

B. 6 bar linkage

C. 8 bar linkage

D. 3 bar linkage

What is the correct answer?

4

In order to balance the reciprocating masses,

A. Primary forces and couples must be balanced

B. Secondary forces and couples must be balanced

C. Both (A) and (B)

D. None of these

What is the correct answer?

4

The total number of instantaneous centres for a mechanism consisting of n links are

A. n/2

B. n

C. n - 1

D. n(n - 1)/2

What is the correct answer?

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

What is the correct answer?

4

Any point on a link connecting double slider crank chain will trace a

A. Straight line

B. Circle

C. Ellipse

D. Parabola

What is the correct answer?

4

The periodic time is given by (where ω = Angular velocity of the particle in rad/s)

A. ω/2π

B. 2π/ω

C. ω × 2π

D. π/ω

What is the correct answer?

4

The Whitworth quick return motion mechanism is formed in a slider crank chain when the

A. Coupler link is fixed

B. Longest link is a fixed link

C. Slider is a fixed link

D. Smallest link is a fixed link

What is the correct answer?

4

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

What is the correct answer?

4

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

A. π (r₁ + r₂) + [(r₁ + r₂)²/x] + 2x

B. π (r₁ + r₂) + [(r₁ - r₂)²/x] + 2x

C. π (r₁ - r₂) + [(r₁ - r₂)²/x] + 2x

D. π (r₁ - r₂) + [(r₁ + r₂)²/x] + 2x

What is the correct answer?

4

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

What is the correct answer?

4

The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at

A. 45° in the direction of rotation of the link containing the path

B. 45° in the direction opposite to the rotation of the link containing the path

C. 90° in the direction of rotation of the link containing the path

D. 180° in the direction opposite to the rotation of the link containing the path

What is the correct answer?

4

The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be

A. To raise the bow and stern

B. To lower the bow and stern

C. To raise the bow and lower the stern

D. To raise the stern and lower the bow

What is the correct answer?

4

For dynamic balancing of a shaft

A. The net dynamic force acting on the shaft is equal to zero

B. The net couple due to the dynamic forces acting on the shaft is equal to zero

C. Both (A) and (B)

D. None of the above

What is the correct answer?

4

Klein's construction can be used when

A. Crank has a uniform angular velocity

B. Crank has non-uniform velocity

C. Crank has uniform angular acceleration

D. Crank has uniform angular velocity and angular acceleration

What is the correct answer?

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

What is the correct answer?

4

In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

A. Will remain same

B. Will change

C. Could change or remain unaltered depending on which link is fixed

D. Will not occur

What is the correct answer?

4

Balancing of rotating and reciprocating parts of an engine is necessary when it runs at

A. Slow speed

B. Moderate speed

C. Highs peed

D. Any one of these

What is the correct answer?

4

The centre of percussion is below the centre of gravity of the body and is at a distance equal to

A. h/kG

B. h²/kG

C. kG²/h

D. h × kG

What is the correct answer?

4

In gears, interference takes place when

A. The tip of a tooth of a mating gear digs into the portion between base and root circles

B. Gears do not move smoothly in the absence of lubrication

C. Pitch of the gears is not same

D. Gear teeth are undercut

What is the correct answer?

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

The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

A. r sinφ

B. r cosφ

C. r tanφ

D. (r/2) cosφ

What is the correct answer?

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