This GATE practice test includes only theory of machines questions which are asked in GATE mechanical question papers. Solve GATE practice tests to get good GATE score and get admission in one of the IITs.

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In which of the following case, the turning moment diagram will have least variations ?

8-cylinder, 4-stroke diesel engine

pelton wheel

Double acting steam Engine

four-stroke single cylinder petrol engine

Rotating shafts tend to vibrate violently at whirling speeds because ...

resonance is caused due to the heavy weight of the rotor

the shafts are rotating at very high speeds

the system is unbalanced

bearing centre line rotating coincides with the axis

In Oldham’s coupling, the condition for maximum speed ratio is…....... where w1 and w is the angular speeds.

The sense of coriolis component is the same as that of the relative velocity vector V rotated….......

180 degrees in the direction opposite to the rotation of the link containing the path.

45 degrees in the direction of rotation of the link containing the path.

45 degrees in the direction opposite to the rotation of the link contaning the path.

90 degrees in the direction of rotation of the link contaning the path.

In involute gears ,the pressure angle is…..............

always constant

dependent on the size of teeth.

dependent on the size of gears

always variable

which one of the following can completely balance several masses revolving in different planes on a shaft ?

A single mass in one of the plane of the revolving masses.

two masses in any two planes

two equal masses in any two planes

A single mass in different planes

In a flat collar pivot bearing, the moment due to friction is proportional to(r1 and r2 are the outer and inner radii respectively)...........

A spring controlled governor is found unstable.it can be made stable by…........

decreasing the ball weight

increasing the ball weight

increasing the spring stiffness

decreasing the spring stiffness

A Hartnell governor has its controlling force F given by, F=p+qr. where “r” is the radius of balls and “p & q” are constants the governor becomes isochronos when….....

p is positive and q=0

p=0 and q is positive

p is negative and q is positive

p is positive and q is also positive

In a multiple v belt drive when a single belt is damaged it is preferable to change the complete set to …..........

ensure uniform loading

reduce vibration

reduce slip

ensure proper alignment

A single spring-mass vibrations system has a natural frequency of N. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become…....

8N

4N

2N

Quick return mechanism is an inversion of….......

double slider crank chain

Crossed slider crank chain

fourbar chain

single slider crank chain

A machine of 100 kg has a 20 kg rotor with 0.5 mm eccentricity .The mounting springs have stiffness 85 kN/m and damping is negligible.if the operating speed is 62.8 rad/second the unit is constructed to move vertically the dynamic amplitude of the machine will be…........

In full depth 14.5 degree involute system, the smallest number of teeth in a pinion which meshes with rack without interference …......

16

12

32

25

A flywheel is fitted to the crankshaft of an engine having “E” amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as and respectively. The kinetic energy of the flywheel is given by…....

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