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Theory of Machine interview questions


Question 1:For high speed engines, the cam follower should move with

cycloidal motion

Question 2: In a coupling rod of a locomotive, each of the four pairs is a __________ pair.

turning

Question 3:In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

0.6

Question 4: If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

180°

Question 5: In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

total lift, total angle of lift, minimum radius of cam and cam speed

Question 6:When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be

unstable

Question 7:The factor which affects the critical speed of a shaft is

diameter of disc

span of shaft

eccentricity

Question 8:The partial balancing of reciprocating parts in locomotives produces

hammer blow

swaying couple

variation in tractive force along the line of stroke

Question 9: The pair is known as a higher pair, when the relative motion between the elements of a pair is

partly turning and partly sliding

Question 10:The Whitworth quick return motion mechanism is formed in a slider crank chain when the

coupler link is fixed

Question 11:The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

0° and 180°

Question 12: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 clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

( ω1 - ω2)r

Question 13:A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m2 attached in the same plane of rotation as that of m1, such that (where r1 and r2 are the radii of rotation of m1 and m2 respectively)

m1r1 = m2r2

Question 14:In railway axle boxes, the bearing used is

double row spherical roller bearing

Question 15: When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

lower pair




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