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 12,000 r.p.m. 9,360 r.p.m. 5,367 r.p.m. 6,000 r.p.m. 12,000 r.p.m. 9,360 r.p.m. 5,367 r.p.m. 6,000 r.p.m. ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine Coriolis component acts Along sliding surfaces None of these Perpendicular to sliding surfaces Somewhere in between above two Along sliding surfaces None of these Perpendicular to sliding surfaces Somewhere in between above two ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system) Less than unity Greater than unity Zero Equal to unity Less than unity Greater than unity Zero Equal to unity ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on A. A triangle A straight line Two lines A point A triangle A straight line Two lines A point A triangle ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position) ω √(x² - r²) ω² √(r² - x²) ω √(r² - x²) ω² √(x² - r²) ω √(x² - r²) ω² √(r² - x²) ω √(r² - x²) ω² √(x² - r²) ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine A spring controlled governor is found unstable. It can be made stable by Decreasing the spring stiffness Increasing the spring stiffness Decreasing the ball mass Increasing the ball mass Decreasing the spring stiffness Increasing the spring stiffness Decreasing the ball mass Increasing the ball mass ANSWER DOWNLOAD EXAMIANS APP
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