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4

The number of links and instantaneous centers in a reciprocating engine mechanism are

A. 4, 4

B. 4, 5

C. 5, 4

D. 4, 6

Correct Answer :

D. 4, 6


Related Questions

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4

In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is

A. 12

B. 16

C. 25

D. 32

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4

According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on

A. A triangle

B. A point

C. Two lines

D. A straight line

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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

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4

When a body is subjected to transverse vibrations, the stress induced in a body will be

A. Shear stress

B. Bending stress

C. Tensile stress

D. Compressive stress

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4

A kinematic chain is known as a mechanism when

A. None of the links is fixed

B. One of the links is fixed

C. Two of the links are fixed

D. None of these

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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

For a kinematic chain to be considered as mechanism

A. Two links should be fixed

B. One link should be fixed

C. None of the links should be fixed

D. There is no such criterion

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4

The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r₁ = Minimum radius of the cam, and θ = Angle turned through by the cam)

A. R (1 - cosθ)

B. (R - r₁) (1 - cosθ)

C. R (1 - sinθ)

D. (R - r₁) (1 - sinθ)

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4

The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)

A. 0.4985/ √δS

B. 0.5615/ √δS

C. 0.571/ √δS

D. 0.6253/ √δS

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4

The velocity of the belt for maximum power is (where m = Mass of the belt in kg per metre length)

A. T/3

B. (T.g)/3

C. √(T/3m)

D. √(3m/T)

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4

In a simple train of wheels, the velocity ratio __________ the intermediate wheels.

A. Depends upon

B. Is independent of

C. Either A or B

D. None of these

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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 the equation are __________ then the system will be under damped.

A. Equal

B. Real

C. Complex conjugate

D. None of these

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4

In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)

A. T₁/T₂ = μ. θ. n

B. T₁/T₂ = [(1 - μ tanθ)/(1 + μ tanθ)]n

C. T₁/T₂ = (μ θ)n

D. T₁/T₂ = [(1 + μ tanθ)/(1 - μ tanθ)]n

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4

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

A. (1/2). μ W cosecα (r₁ + r₂)

B. (2/3). μ W cosecα (r₁ + r₂)

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

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

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4

In an open pair, the two elements of a pair

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. Are not held together mechanically

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4

In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called

A. Fluctuation of energy

B. Maximum fluctuation of energy

C. Coefficient of fluctuation of energy

D. None of these

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4

Effort 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

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4

Which of the following has sliding motion?

A. Crank

B. Connecting rod

C. Crank pin

D. Crosshead

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4

Throw of a cam is the maximum distance of the follower from

A. Base circle

B. Pitch circle

C. Root circle

D. Prime circle

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4

Which of the following is an open pair?

A. Ball and socket joint

B. Journal bearing

C. Lead screw and nut

D. Cam and follower

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4

In a multiple V-belt drive, if one of the belts is broken, then we should replace

A. The broken belt only

B. All the belts

C. The broken belt and the belts on either side of it

D. None of the above

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4

Which of the following is a higher pair?

A. Belt and pulley

B. Turning pair

C. Screw pair

D. Sliding pair

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4

The periodic time of one oscillation for a simple pendulum is

A. 2π. √(g/l)

B. (1/2π). √(g/l)

C. 2π. √(l/g)

D. (1/2π). √(l/g)

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4

The cam and follower is an example of

A. Sliding pair

B. Rolling pair

C. Lower pair

D. Higher pair

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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

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4

Which of the following is an inversion of a single slider crank chain?

A. Pendulum pump

B. Oscillating cylinder engine

C. Rotary internal combustion engine

D. All of these

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4

In order to give a complete secondary balance of a multi-cylinder inline engine,

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

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

C. Both (A) and (B)

D. None of these

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4

Two heavy rotating masses are connected by shafts of lengths l₁, l₂ and l₃ and the corresponding diameters are d₁, d₂ and d₃. This system is reduced to a torsionally equivalent system having uniform diameter d = d₁ of the shaft. The equivalent length of the shaft is

A. (l₁ + l₂ + l₃)/3

B. l = l₁ + l₂.(d₁/d₂)³ + l₂.(d₁/d₃)³

C. l = l₁ + l₂.(d₁/d₂)⁴ + l₃.(d₁/d₃)⁴

D. l₁ + l₂ + l₃

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4

The cam follower generally used in automobile engines is

A. Knife edge follower

B. Flat faced follower

C. Spherical faced follower

D. Roller follower

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4

The pressure angle of a cam depends upon

A. Offset between centre lines of cam and follower

B. Lift of follower

C. Angle of ascent

D. All of the above