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4

A point on a link connecting double slider crank chain traces a

A. Ellipse

B. Circle

C. Parabola

D. Hyperbola

Correct Answer :

A. Ellipse


Related Questions

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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)

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4

Which of the following mechanism is obtained from lower pair?

A. Gyroscope

B. Pantograph

C. Valve and valve gears

D. All of the above

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4

Cross head and guides form a

A. Lower pair

B. Higher pair

C. Turning pair

D. Sliding pair

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4

The power from the engine to the rear axle of an automobile is transmitted by means of

A. Worm and worm wheel

B. Spur gears

C. Bevel gears

D. Hooke's joint

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4

A shaft carrying two rotors at its ends will have

A. No node

B. One node

C. Two nodes

D. Three nodes

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4

Sensitiveness of the governor is defined as the ratio of the

A. Mean speed to the maximum equilibrium speed

B. Mean speed to the minimum equilibrium speed

C. Difference of the maximum and minimum equilibrium speeds to the mean speed

D. Sum of the maximum and minimum equilibrium speeds to the mean speed

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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

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

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4

The length of a simple pendulum which gives the same frequency as the compound pendulum, is

A. kG + l₁

B. kG² + l₁

C. (kG² + l₁²)/ l₁

D. (kG + l₁²)/ l₁

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4

In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as

A. Critical damping ratio

B. Damping factor

C. Logarithmic decrement

D. Magnification factor

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4

A rotary internal combustion engine has __________ cylinders.

A. Four

B. Five

C. Six

D. Seven

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4

The Hooke's joint consists of:

A. Two forks

B. One fork

C. Three forks

D. Four forks

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4

An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

A. Addendum circle

B. Dedendum circle

C. Pitch circle

D. Clearance circle

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4

For an isochronous Hartnell governor (where r₁ and r₂ = Maximum and minimum radius of rotation of balls respectively, S₁ and S₂ = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)

A. (m.g + S₁)/(m.g + S₂) = r₁/r₂

B. (m.g - S₁)/(m.g - S₂) = r₂/r₁

C. S₁/S₂ = r₁/r₂

D. S₂/S₁ = r₁/r₂

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4

A Porter governor is a

A. Pendulum type governor

B. Dead weight governor

C. Spring loaded governor

D. Inertia governor

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4

In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then

A. Open belt drive is recommended

B. Crossed belt drive is recommended

C. Both open belt drive and crossed belt drive is recommended

D. The drive is recommended depending upon the torque transmitted

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4

The unbalanced force due to reciprocating masses

A. Varies in magnitude but constant in direction

B. Varies in direction but constant in magnitude

C. Varies in magnitude and direction both

D. Constant in magnitude and direction both

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4

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

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4

A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is

A. 5,367 r.p.m.

B. 6,000 r.p.m.

C. 9,360 r.p.m.

D. 12,000 r.p.m.

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4

When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

A. ω² r {(n + 1)/n}

B. ω² r {(n - 1)/n}

C. ω² r {n/(n + 1)}

D. ω² r {n/(n - 1)}

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4

The two elements of a pair are said to form a higher pair, when they

A. Have a surface contact when in motion

B. Have a line or point contact when in motion

C. Are kept in contact by the action of external forces, when in motion

D. Permit relative motion

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4

The frequency of oscillation of a compound pendulum is

A. 2π. √[gh/(kG² + h²)]

B. 2π. √[(kG² + h²)/gh]

C. (1/2π). √[gh/(kG² + h²)]

D. (1/2π). √[(kG² + h²)/gh]

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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

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4

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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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

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4

The frequency of oscillation of a torsional pendulum is

A. 2πk/r. √(g/l)

B. r/2πk. √(l/g)

C. 2πr/k. √(g/l)

D. r/2πk. √(g/l)

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4

Which of the following is a pendulum type governor?

A. Watt governor

B. Porter governor

C. Hartnell governor

D. None of these

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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°

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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

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4

Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

A. 18

B. 20

C. 30

D. 34