The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

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The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

A. (1/2) μ W R

B. (2/3) μ W R

C. (3/4) μ W R

D. μ W R

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In S.H.M., the velocity vector w.r.t. displacement vector

A. Leads by 90°

B. Lags by 90°

C. Leads by 180°

D. Are in phase

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A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

A. Straight line path

B. Hyperbolic path

C. Parabolic path

D. Elliptical path

Discuss this answer

A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

A. The sum of the two masses is equal to the total mass of body

B. The centre of gravity of the two masses coincides with that of the body

C. The sum of mass moment of inertia of the masses about their centre of gravity is equal to the mass moment of inertia of the body

D. All of the above

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The relative velocity of B with respect to A in a rigid link AB is

A. Parallel to AB

B. Perpendicular to AB

C. Along AB

D. At 45° to AB

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In higher pair, the relative motion is

A. Purely turning

B. Purely sliding

C. Purely rotary

D. Combination of sliding and turning

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The partial balancing of reciprocating parts in locomotives produces

A. Hammer blow

B. Swaying couple

C. Variation in tractive force along the line of stroke

D. All of the above

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In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should

A. Be zero

B. Act in upward direction

C. Act in downward direction

D. None of the above

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For the same lift and same angle of ascent, a smaller base circle will give

A. A small value of pressure angle

B. A large value of pressure angle

C. There is no such relation with pressure angle

D. Something else

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In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

A. 10°-15°

B. 15°-25°

C. 25°-30°

D. 30°-40°

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A Hartnell governor is a

A. Dead weight governor

B. Pendulum type governor

C. Spring loaded governor

D. Inertia governor

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Klein's construction can be used to determine acceleration of various parts when the crank is at

A. Inner dead centre

B. Outer dead centre

C. Right angles to the link of the stroke

D. All of the above

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A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents

A. Free vibration with damping

B. Free vibration without damping

C. Forced vibration with damping

D. Forced vibration without damping

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The partial balancing means

A. Balancing partially revolving masses

B. Balancing partially reciprocating masses

C. Best balancing of engines

D. All of these

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In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

A. Cause withdrawing or throttling of steam

B. Reduce length of effective stroke of piston

C. Reduce maximum opening of port to steam

D. All of these

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When a point moves along a straight line, its acceleration will have

A. Radial component only

B. Tangential component only

C. Coriolis component only

D. Radial and tangential components both

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When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

A. To move the ship towards starboard

B. To move the ship towards port side

C. To raise the bow and lower the stern

D. To raise the stern and lower the bow

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Kinematic 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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Module of a gear is

A. D/T

B. T/D

C. 2D/T

D. 2T/D

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The acceleration of a particle moving with simple harmonic motion, at any instant is given by

A. ωx

B. ω²x

C. ω²/x

D. ω³/x

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The flank of the tooth is the surface of the tooth __________ the pitch surface.

A. Above

B. Below

C. At

D. None of these

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If ω/ω_n is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

A. 0°

B. 90°

C. 180°

D. 360°

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Ackermann steering gear consists of

A. Sliding pairs

B. Turning pairs

C. Rolling pairs

D. Higher pairs

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Pitch point of a cam is

A. A point on the pitch curve having minimum pressure angle

B. A point on the pitch curve having maximum pressure angle

C. Any point on the pitch curve

D. Any point on the pitch circle

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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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A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

A. m₁r₂ = m₂r₁

B. m₁r₁ = m₂r₂

C. m₁m₂ = r₁r₂

D. None of these

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Which of the following statement is correct as regard to the difference between a machine and a structure?

A. The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another

B. The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only

C. A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work

D. All of the above

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According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centres will lie on a

A. Straight line

B. Parabolic curve

C. Triangle

D. Rectangle

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In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

A. n₁ + n₂

B. n₁ + n₂ + 1

C. n₁ + n₂ - 1

D. n₁ + n₂ - 2

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V-belts are usually used for

A. Long drives

B. Short drives

C. Long and short drives

D. None of these

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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

Discuss this answer

Accepted Answer

B. (2/3) μ W R

The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

Correct Answer :

Show all Theory of Machines MCQ

Related Questions

In S.H.M., the velocity vector w.r.t. displacement vector

A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

The relative velocity of B with respect to A in a rigid link AB is

In higher pair, the relative motion is

The partial balancing of reciprocating parts in locomotives produces

In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should

For the same lift and same angle of ascent, a smaller base circle will give

In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

A Hartnell governor is a

Klein's construction can be used to determine acceleration of various parts when the crank is at

A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents

The partial balancing means

In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

When a point moves along a straight line, its acceleration will have

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

Kinematic pairs are those which have

Module of a gear is

The acceleration of a particle moving with simple harmonic motion, at any instant is given by

The flank of the tooth is the surface of the tooth __________ the pitch surface.

If ω/ω_n is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

Ackermann steering gear consists of

Pitch point of a cam is

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 disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

Which of the following statement is correct as regard to the difference between a machine and a structure?

According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centres will lie on a

In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

V-belts are usually used for

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

Also checkout

The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

Correct Answer :

Show all Theory of Machines MCQ

Related Questions

In S.H.M., the velocity vector w.r.t. displacement vector

A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

The relative velocity of B with respect to A in a rigid link AB is

In higher pair, the relative motion is

The partial balancing of reciprocating parts in locomotives produces

In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T₁ acts at A and smaller tension T₂ at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should

For the same lift and same angle of ascent, a smaller base circle will give

In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

A Hartnell governor is a

Klein's construction can be used to determine acceleration of various parts when the crank is at

A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents

The partial balancing means

In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

When a point moves along a straight line, its acceleration will have

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

Kinematic pairs are those which have

Module of a gear is

The acceleration of a particle moving with simple harmonic motion, at any instant is given by

The flank of the tooth is the surface of the tooth __________ the pitch surface.

If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

Ackermann steering gear consists of

Pitch point of a cam is

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 disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

Which of the following statement is correct as regard to the difference between a machine and a structure?

According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centres will lie on a

In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

V-belts are usually used for

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

Also checkout

If ω/ω_n is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach