Home
Current Affairs January 2024

What is the correct answer?

4

The motion of a shaft in a circular hole is an example of

A. Completely constrained motion

B. Incompletely constrained motion

C. Successfully constrained motion

D. None of these

Correct Answer :

B. Incompletely constrained motion


Related Questions

What is the correct answer?

4

Transmission angle is the angle between

A. Input link and coupler

B. Input link and fixed link

C. Output link and coupler

D. Output link and fixed link

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

What is the correct answer?

4

The coriolis component of acceleration leads the sliding velocity by

A. 45°

B. 90°

C. 135°

D. 180°

What is the correct answer?

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.

What is the correct answer?

4

The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

A. 90° and 180°

B. 45° and 225°

C. 180° and 270°

D. 270° and 360°

What is the correct answer?

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, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other.

A. Infinity

B. Zero

C. Any +ve value

D. Any -ve value

What is the correct answer?

4

A circular bar moving in a round hole is an example of

A. Incompletely constrained motion

B. Partially constrained motion

C. Completely constrained motion

D. Successfully constrained motion

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

When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

A. Tension in the tight side of the belt

B. Tension in the slack side of the belt

C. Sum of the tensions on the tight side and slack side of the belt

D. Average tension of the tight side and slack side of the belt

What is the correct answer?

4

Elements of pairs held together mechanically is known as

A. Closed pair

B. Open pair

C. Mechanical pair

D. Rolling pair

What is the correct answer?

4

A system in dynamic balance implies that

A. The system is critically damped

B. There is no critical speed in the system

C. The system is also statically balanced

D. There will absolutely no wear of bearings

What is the correct answer?

4

Which of the following statement is correct?

A. For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of gears.

B. For involute gears, the pressure angle changes with the change in centre distance between gears.

C. The epicyclic gear trains involve rotation of atleast one gear axis about some other gear axis.

D. All of the above

What is the correct answer?

4

In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.

A. Equal to

B. Less than

C. Greater than

D. None of these

What is the correct answer?

4

The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.

A. Same

B. Different

C. Unpredictable

D. None of these

What is the correct answer?

4

The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)

A. sinα = b/c

B. cosα = c/b

C. tanα = c/2b

D. cotα = c/2b

What is the correct answer?

4

Whitworth quick return mechanism is obtained by inversion of

A. Slider crank mechanism

B. Kinematic chain

C. Five link mechanism

D. Roller cam mechanism

What is the correct answer?

4

The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0 If the roots of this equation are real, then the system will be

A. Over-damped

B. Under damped

C. Critically damped

D. Without vibrations

What is the correct answer?

4

The tendency of a body to resist change from rest or motion is known as

A. Mass

B. Friction

C. Inertia

D. Resisting force

What is the correct answer?

4

Typewriter constitutes

A. Machine

B. Structure

C. Mechanism

D. Inversion

What is the correct answer?

4

When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

A. [(r² + R²) cosφ]/2

B. [(r² + R²) sinφ]/2

C. [(r + R) cosφ]/2

D. [(r + R) sinφ]/2

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

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

What is the correct answer?

4

The coriolis component of acceleration depends upon

A. Velocity of slider

B. Angular velocity of the link

C. Both (A) and (B)

D. None of these

What is the correct answer?

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

What is the correct answer?

4

When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move the ship towards port side.

A. Upward

B. Downward

C. Forward

D. Backward

What is the correct answer?

4

The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is

A. 3 Hz

B. 3π Hz

C. 6 Hz

D. 6π Hz

What is the correct answer?

4

Klein's construction gives a graphic construction for

A. Slider-crank mechanism

B. Velocity polygon

C. Acceleration polygon

D. Four bar chain mechanism

What is the correct answer?

4

When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a

A. Screw pair

B. Spherical pair

C. Turning pair

D. Sliding pair

What is the correct answer?

4

Angle of ascent of cam is defined as the angle

A. During which the follower returns to its initial position

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

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

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

What is the correct answer?

4

In a four bar chain or quadric cycle chain

A. Each of the four pairs is a turning pair

B. One is a turning pair and three are sliding pairs

C. Two are turning pairs and two are sliding pairs

D. Three are turning pairs and one is a sliding pair