For constant velocity ratio transmission between two gears, the common normal at the point of contact must always pass through a fixed point on the line joining the centres of rotation of gears.

For involute gears, the pressure angle changes with the change in centre distance between gears.

The epicyclic gear trains involve rotation of atleast one gear axis about some other gear axis.

All of the above

**When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be****In railway axle boxes, the bearing used is****The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given…****The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel,…****In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of…****A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping…****The mechanism in which two are turning pairs and two are sliding pairs, is called a****Which of the following mechanism is an approximate straight line motion mechanism?****When the addenda on pinion and wheel is such that the path of approach and path of recess are half of…****A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx…****Peaucelliers mechanism has****Which of the following statement is correct?****Cylindrical cams can be classified as****Efficiency of a screw jack is given by****Which of the following statement is correct?****In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line…****The amplitude of vibration is always __________ the radius of the circle.****In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted…****In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and…****The maximum or minimum value of the swaying couple is****The ratio of the number of teeth to the pitch circle diameter in millimetres, is called****Under logarithmic decrement, the amplitude of successive vibrations are****A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied…****If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for…****When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move…****The angle of inclination of the plane, at which the body begins to move down the plane is called****The driving and driven shafts connected by a Hooke's joint will have equal speeds, if****In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be****When two links are connected by a pin joint, their instantaneous centre lies****Klein's construction can be used to determine acceleration of various parts when the crank is at**