The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

Theory of Machine
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

m.ω².r sinθ

m.ω².r cosθ

m.ω².r (cos 2θ/n)

m.ω².r (sin 2θ/n)

m.ω².r sinθ

m.ω².r cosθ

m.ω².r (cos 2θ/n)

m.ω².r (sin 2θ/n)

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Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

15

8

30

28

15

8

30

28

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Theory of Machine
The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

sin (θ + φ) + 1/ cos (θ - φ) + 1

cos (θ - φ) + 1/ cos (θ + φ) + 1

cos (θ - φ) + 1/ sin (θ + φ) + 1

cos (θ + φ) + 1/ cos (θ - φ) + 1

sin (θ + φ) + 1/ cos (θ - φ) + 1

cos (θ - φ) + 1/ cos (θ + φ) + 1

cos (θ - φ) + 1/ sin (θ + φ) + 1

cos (θ + φ) + 1/ cos (θ - φ) + 1

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Theory of Machine
The contact ratio is given by

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

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

(Length of the arc of approach)/cosφ

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

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

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

(Length of the arc of approach)/cosφ

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

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Theory of Machine
The example of higher pair is

All of these

Belt, rope and chain drives

Ball and roller bearings

Gears, cams

All of these

Belt, rope and chain drives

Ball and roller bearings

Gears, cams

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Theory of Machine
The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

To raise the nose and dip the tail

To raise the nose and tail

To dip the nose and tail

To dip the nose and raise the tail

To raise the nose and dip the tail

To raise the nose and tail

To dip the nose and tail

To dip the nose and raise the tail

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Theory of Machine

Theory of Machine What is the number of instantaneous centers for an eight link mechanism?

Theory of Machine The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

Theory of Machine The contact ratio is given by

Theory of Machine The example of higher pair is

Theory of Machine The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

Theory of Machine
The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

Theory of Machine
The contact ratio is given by

Theory of Machine
The example of higher pair is

Theory of Machine
The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be