Theory of Machine Which of the following statements regarding laws governing the friction between dry surfaces are correct? The friction force is independent of me area of contact. All of these The friction force is directly proportional to the normal force. The friction force is dependent on the materials of the contact surfaces. The friction force is independent of me area of contact. All of these The friction force is directly proportional to the normal force. The friction force is dependent on the materials of the contact surfaces. ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O) (ω₁ + ω₂) r ω₁.ω₂.r (ω₁ - ω₂) r (ω₁ - ω₂) 2r (ω₁ + ω₂) r ω₁.ω₂.r (ω₁ - ω₂) r (ω₁ - ω₂) 2r ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine In an open pair, the two elements of a pair Are kept in contact by the action of external forces, when in motion Have a line or point contact when in motion Are not held together mechanically Have a surface contact when in motion Are kept in contact by the action of external forces, when in motion Have a line or point contact when in motion Are not held together mechanically Have a surface contact when in motion ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base) sinφ + sinα = b/c cosφ - sinα = c/b cotφ - cotα = c/b tanφ + cotα = b/c sinφ + sinα = b/c cosφ - sinα = c/b cotφ - cotα = c/b tanφ + cotα = b/c ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The maximum or minimum value of the swaying couple is ± a (1 - c) m.ω².r ± 2a (1 - c) m.ω².r ± (a/√2) (1 - c) m.ω².r ± c.m.ω².r ± a (1 - c) m.ω².r ± 2a (1 - c) m.ω².r ± (a/√2) (1 - c) m.ω².r ± c.m.ω².r ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when a = 0 and b is +ve a is +ve and b is -ve a is +ve and b = 0 a is +ve and b is also +ve a = 0 and b is +ve a is +ve and b is -ve a is +ve and b = 0 a is +ve and b is also +ve ANSWER DOWNLOAD EXAMIANS APP
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