A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.22 mm

2.50 mm

2 mm

3.0 mm

2.22 mm

2.50 mm

2 mm

3.0 mm

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Theory of Machine
For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

Both governors A and B are equally sensitive

Governor A is more sensitive than governor B

None of these

Governor B is more sensitive than governor A

Both governors A and B are equally sensitive

Governor A is more sensitive than governor B

None of these

Governor B is more sensitive than governor A

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Theory of Machine
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)

ωr [sin θ + (sin 2θ/n)]

ωr [cos θ + (cos 2θ/n)]

ω²r [sin θ + (sin 2θ/n)]

ω²r [cos θ + (cos 2θ/n)]

ωr [sin θ + (sin 2θ/n)]

ωr [cos θ + (cos 2θ/n)]

ω²r [sin θ + (sin 2θ/n)]

ω²r [cos θ + (cos 2θ/n)]

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Theory of Machine
Creep in belt drive is due to

Uneven extensions and contractions due to varying tension

Material of the belt

Material of the pulley

Larger size of the driver pulley

Uneven extensions and contractions due to varying tension

Material of the belt

Material of the pulley

Larger size of the driver pulley

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Theory of Machine
The advantage of the piston valve over the slide valve is that in the former case

Wear is less

The pressure developed being high provides tight sealing

Both wear and power absorbed are low

Power absorbed is less

Wear is less

The pressure developed being high provides tight sealing

Both wear and power absorbed are low

Power absorbed is less

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Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

(S₁ + S₂) / 2h

(S₁ - S₂) / h

(S₁ + S₂) / h

(S₁ - S₂) / 2h

(S₁ + S₂) / 2h

(S₁ - S₂) / h

(S₁ + S₂) / h

(S₁ - S₂) / 2h

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Theory of Machine

Theory of Machine For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

Theory of Machine The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)

Theory of Machine Creep in belt drive is due to

Theory of Machine The advantage of the piston valve over the slide valve is that in the former case

Theory of Machine In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

Theory of Machine
For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

Theory of Machine
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)

Theory of Machine
Creep in belt drive is due to

Theory of Machine
The advantage of the piston valve over the slide valve is that in the former case

Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)