Theory of Machine A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is 9,360 r.p.m. 6,000 r.p.m. 12,000 r.p.m. 5,367 r.p.m. 9,360 r.p.m. 6,000 r.p.m. 12,000 r.p.m. 5,367 r.p.m. ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The axis of precession is __________ to the plane in which the axis of spin is going to rotate. Parallel None of these Perpendicular Both A and B Parallel None of these Perpendicular Both A and B ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The periodic time is given by (where ω = Angular velocity of the particle in rad/s) π/ω 2π/ω ω/2π ω × 2π π/ω 2π/ω ω/2π ω × 2π ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will Become equal to R/4 Become equal to R/2 Remain same as before Become equal to 2R Become equal to R/4 Become equal to R/2 Remain same as before Become equal to 2R ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient. Equal to Independent of Directly proportional to Inversely proportional to Equal to Independent of Directly proportional to Inversely proportional to ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine Which of the below are inversions of slider crank mechanism?1. Oscillating cylinder engine mechanism2. Toggle mechanism3. Radial cylinder engine mechanism4. Quick return mechanism 1, 2 and 4 2, 3 and 4 1, 2 and 3 1, 3 and 4 1, 2 and 4 2, 3 and 4 1, 2 and 3 1, 3 and 4 ANSWER DOWNLOAD EXAMIANS APP
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