Home
Current Affairs January 2024

What is the correct answer?

4

Angle of dwell of cam is defined as the angle

A. During which the follower returns to its initial position

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

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

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

Correct Answer :

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


Related Questions

What is the correct answer?

4

A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is

A. Kinematically sound

B. Not sound

C. Soundness would depend upon which link is kept fixed

D. Data is not sufficient to determine same

What is the correct answer?

4

The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

A. Damping factor

B. Damping coefficient

C. Logarithmic decrement

D. Magnification factor

What is the correct answer?

4

The maximum velocity of a particle moving with simple harmonic motion is

A. ω

B. ωr

C. ω²r

D. ω/r

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 relation between number of pairs (p) forming a kinematic chain and the number of links (l) is

A. l = 2p - 2

B. l = 2p - 3

C. l = 2p - 4

D. l = 2p - 5

What is the correct answer?

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

What is the correct answer?

4

Kinematic pairs are those which have two elements that

A. Have line contact

B. Have surface contact

C. Permit relative motion

D. Are held together

What is the correct answer?

4

Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open 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

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

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

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

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 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

What is the correct answer?

4

In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

A. P = W tan(α - φ)

B. P = W tan(α + φ)

C. P = W tan(φ - α)

D. P = W cos(α + φ)

What is the correct answer?

4

An exact straight line motion mechanism is a

A. Scott-Russell's mechanism

B. Hart's mechanism

C. Peaucellier's mechanism

D. All of these

What is the correct answer?

4

A mechanism __________ for transmitting or transforming motion.

A. Can be used

B. Cannot be used

C. Unpredictable

D. None of these

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

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)

What is the correct answer?

4

In a mechanism, the fixed instantaneous centres are those centres which

A. Remain in the same place for all configurations of the mechanism

B. Vary with the configuration of the mechanism

C. Moves as the mechanism moves, but joints are of permanent nature

D. None of the above

What is the correct answer?

4

The C.G. of a link in any mechanism would experience

A. No acceleration

B. Linear acceleration

C. Angular acceleration

D. Both angular and linear accelerations

What is the correct answer?

4

The unbalanced primary forces in a reciprocating engine are

A. Balanced completely

B. Balanced partially

C. Balanced by secondary forces

D. Not balanced

What is the correct answer?

4

The centre distance between two meshing involute gears is equal to

A. Sum of base circle radii/cosφ

B. Difference of base circle radii/ cosφ

C. Sum of pitch circle radii/ cosφ

D. Difference of pitch circle radii/ cosφ

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

The driving and driven shafts connected by a Hooke's joint will have equal speeds, if

A. cosθ = sinα

B. sinθ = ± tanα

C. tanθ = ± cosα

D. cotθ = cosα

What is the correct answer?

4

When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

A. Stable

B. Unstable

C. Isochronous

D. Hunt

What is the correct answer?

4

In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines,

A. The algebraic sum of the primary forces must be equal to zero

B. The algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero

C. Both (A) and (B)

D. None of these

What is the correct answer?

4

The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity.

A. Zero

B. Minimum

C. Maximum

D. None of these

What is the correct answer?

4

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

What is the correct answer?

4

When a ship travels in a sea, which of the effect is more dangerous

A. Steering

B. Pitching

C. Rolling

D. All of the above

What is the correct answer?

4

The swaying couple is due to the

A. Primary unbalanced force

B. Secondary unbalanced force

C. Two cylinders of locomotive

D. Partial balancing

What is the correct answer?

4

If the opposite links of a four bar linkage are equal, the links will always form a

A. Triangle

B. Rectangle

C. Parallelogram

D. Pentagon