Q. The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

View solution

Q. A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

View solution

Q. In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then

View solution

Q. The critical speed of a shaft depends upon its

View solution

Q. Which of the following mechanism is an approximate straight line motion mechanism?

View solution

Q. A shaft carrying two rotors at its ends will have

View solution

Q. When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

View solution

Q. The friction experienced by a body, when at rest, is known as static friction.

View solution

Q. The instantaneous centre of a rigid thin disc rolling on a plane rigid surface is located at

View solution

Q. In a flat collar pivot bearing, the moment due to friction is proportional to

View solution

Q. The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.

View solution

Q. A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

View solution

Q. When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in __________ directions.

View solution

Q. The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

View solution

Q. At the node, the shaft remains unaffected by the vibration.

View solution

Q. 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 anti-clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

View solution

Q. When the two elements of a pair have __________ when in motion, it is said to a lower pair.

View solution

Q. The sensitiveness of a governor depends upon the lift of the sleeve.

View solution

Q. The ratio of maximum fluctuation of energy to the workdone per cycle is called

View solution

Q. In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, This method will

View solution