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4

The minimum force required to slide a body of weight W on a rough horizontal plane is

A. W sinθ

B. W cosθ

C. W tanθ

D. W cosecθ

Correct Answer :

A. W sinθ


Related Questions

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4

The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

A. Pitch circle

B. Base circle

C. Pitch curve

D. Prime circle

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4

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

A. ω

B. ωr

C. ω²r

D. ω/r

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4

Hammer blow

A. Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.

B. Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

C. Varies as the square root of the speed

D. Varies inversely with the square of the speed

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4

When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

A. Lower pair

B. Higher pair

C. Self-closed pair

D. Force-closed pair

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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

The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.

A. One-third

B. Two-third

C. Double

D. Three times

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4

With usual notations for different parameters involved, the maximum fluctuations of energy for a flywheel is given by

A. 2ECS

B. ECS/2

C. 2ECS²

D. 2E²CS

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4

In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be

A. Less sensitive

B. More sensitive

C. Unaffected of sensitivity

D. Isochronous

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4

The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

A. 0° and 90°

B. 0° and 180°

C. 90° and 180°

D. 180° and 360°

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4

Which of the following statement is correct?

A. The power absorbed in operating the piston valve is less than D-slide valve

B. The wear of the piston valve is less than the wear of the D-slide valve

C. The D-slide valve is also called outside admission valve.

D. All of the above

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4

The stress induced in a body will be shear stress, when it is subjected to

A. Longitudinal vibrations

B. Transverse vibrations

C. Torsional vibrations

D. None of these

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4

If D₁ and D₂ be the diameters of driver and driven pulleys, then belt speed is proportional to

A. D₁/D₂

B. D₂/D₁

C. D₁.D₂

D. D₁

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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

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4

The contact ratio is given by

A. (Length of the path of approach)/(Circular pitch)

B. (Length of path of recess)/(Circular pitch)

C. (Length of the arc of contact)/(Circular pitch)

D. (Length of the arc of approach)/cosφ

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4

A shaft carrying three rotors will have

A. No node

B. One node

C. Two nodes

D. Three nodes

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4

The sensitiveness of the governor __________ as the speed range decreases.

A. Remains unaffected

B. Decreases

C. Increases

D. None of these

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4

In a reciprocating steam engine, which of the following forms a kinematic link?

A. Cylinder and piston

B. Piston rod and connecting rod

C. Crankshaft and flywheel

D. Flywheel and engine frame

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4

In a single slider crank 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

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4

In its simplest form, a cam mechanism consists of following number of links

A. 1

B. 2

C. 3

D. 4

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4

The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is

A. (1/2). μ W cosec α (r₁ + r₂)

B. (2/3).μ W cosec α (r₁ + r₂)

C. (1/2). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]

D. (2/3). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]

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4

Which of the following is an example of a higher pair?

A. Toothed gearing

B. Belt and rope drive

C. Ball and roller bearing

D. All of these

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4

In a gear having involute teeth, the normal to the involute is a tangent to the

A. Pitch circle

B. Base circle

C. Addendum circle

D. Dedendum circle

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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

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4

The centrifugal tension in belts

A. Increases power transmitted

B. Decreases power transmitted

C. Have no effect on power transmitted

D. Increases power transmitted upto a certain speed and then decreases

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4

The frictional torque transmitted in a flat 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

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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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

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4

The included angle for the V-belt is usually

A. 10° to 20°

B. 20° to 30°

C. 30° to 40°

D. 60° to 80°

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4

The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position)

A. ω √(x² - r²)

B. ω √(r² - x²)

C. ω² √(x² - r²)

D. ω² √(r² - x²)

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4

Power 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