Description : The number of natural frequencies in a two rotor system is A. Infinite B. Zero C. Two D. Four
Last Answer : C. Two
Description : In semi-definite system one of the natural frequencies is A Zero B One C Two D Infinite
Last Answer : A Zero
Description : In semidefinite system one of the natural frequencies is A. Zero B. Non-zero C. Infinite one D. One
Last Answer : A. Zero
Description : If two discs are attached to one shaft at its both end, then it has_____ number of natural frequencies. A Infinite B One C Two D None of the mentioned
Last Answer : B One
Description : The number of natural frequency in two rotor system is A Zero B Infinite C Two D One
Last Answer : C Two
Description : A cantilever shaft having 50 mm diameter and length of 300 mm has a disc of mass 100 kg at its free enD. The Young’s modulus for the shaft material is 200 GN/m 2 . Calculate the natural longitudinal frequency in Hz. A. 575B. 625 C. 525 D. 550
Last Answer : A. 575
Description : A cantilever shaft having 50 mm diameter and length of 300 mm has a disc of mass 100 kg at its free end. The Young’s modulus for the shaft material is 200 GN/m 2 . Calculate the natural longitudinal frequency in Hz. a) 575 b) 625 c) 525 d) 550
Last Answer : a) 575
Description : The number of distinct natural frequencies for an n-degree-of-freedom system can be a. 1 b. ∞ c. n
Last Answer : c. n
Description : The speed at which the shaft runs so that the additional deflection of the shaft from the axis of rotation becomes ___________, is known as critical or whirling speed. (A) zero (B) minimum (C) maximum (D) infinite
Last Answer : (D) infinite
Description : In a 2-mass 3 spring vibrating system the two masses each are of 9.8 kg coupling spring is having a stiffness of 3430 N/m whereas the other two springs have each a stiffness of 8820 N/m. The two natural frequencies in rad /sec are A) 10 & 20 B) 20 & 30 C) 30 & 40D) 40 & 50
Last Answer : C) 30 & 40
Description : In semi definite system, one of the natural frequencies is found to 15 Hz. The other natural frequency will be A. 15 Hz B. 0 Hz C. 30 Hz D. None of these
Last Answer : B. 0 Hz
Description : The vibrations can be controlled by A. Controlling the natural frequencies B. Using proper damping devices C. Introducing vibration absorbers and vibration isolators D. All the above
Last Answer : D. All the above
Description : When the speed of rotation of a shaft equals one of the natural frequencies of the shaft, it is called____________speed.
Last Answer : Ans- Critical
Description : FFT analyzer can be used to find the ___________. (A) natural frequencies (B) mode shapes(C) both natural frequencies and mode shapes (D) none of the above
Last Answer : (C) both natural frequencies and mode shapes
Description : A cantilever shaft having 50 mm diameter and a length of 300mm has a disc of mass 100 kg at its free end. The Young’s modulus for the shaft material is 200 GN/m^2. Determine the static deflection of shaft in mm. A 0.144 B 0.244 C 0.344 D 0.444
Last Answer : A 0.144
Description : A cantilever shaft having 50 mm diameter and a length of 300 mm has a disc of mass 100 kg at its free end. The Young’s modulus for the shaft material is 200 GN/m 3 . Determine the static deflection of the shaft in mm. a) 0.147 b) 0.213 c) 0.132 d) 0.112
Last Answer : a) 0.147
Description : A cantilever shaft having 50 mm diameter and a length of 300 mm has a disc of mass 100 kg at its free end. The Young’s modulus for the shaft material is 200 GN/m 2 . Determine the frequency of transverse vibrations of the shaft. a) 31 b) 35 c) 37 d) 41
Last Answer : d) 41
Description : A cantilever shaft has a diameter of 6 cm and the length is 40cm, it has a disc of mass 125 kg at its free end. The Young’s modulus for the shaft material is 250 GN/m2. Calculate the static deflection in nm. a) 0.001 b) 0.083c) 1.022 d) 0.065
Last Answer : a) 0.001
Description : What are discrete parameter systems? *1 point (A) Systems which have infinite number of degree of freedom (B) Systems which have finite number of degree of freedom (C) Systems which have no degree of freedom (D) None of the above
Last Answer : (B) Systems which have finite number of degree of freedom
Description : What are discrete parameter systems? A. Systems which have infinite number of degree of freedom B. Systems which have finite number of degree of freedom C. Systems which have no degree of freedom D. None of the above
Last Answer : B. Systems which have finite number of degree of freedom
Description : What are discrete parameter systems?a. Systems which have infinite number of degree of freedom b. Systems which have finite number of degree of freedom c. Systems which have no degree of freedom d. None of the above
Last Answer : b. Systems which have finite number of degree of freedom
Description : Beats phenomenon occurs when a vibrating system is subjected to two different frequencies which are A) Quite different B) Equal C) Slightly different D) Integral multiple of each other
Last Answer : C) Slightly different
Description : During free vibration, different degrees of freedom oscillate at different frequencies.
Last Answer : False
Description : The speed at which the shaft runs so that the additional deflection from the axis of rotation of the shaft becomes infinite, is known as _________ * 1 point (A) Whirling speed (B) Rotational speed (C) Stabilizing speed (D) Reciprocating speed
Last Answer : (A) Whirling speed
Description : The speed at which the shaft runs so that the additional deflection from the axis of rotation of the shaft becomes infinite, is known as _________ A. Whirling speed B. Rotational speed C. Stabilizing speed D. Reciprocating speed
Last Answer : A. Whirling speed
Description : If the damper is not provided and the system is in resonance, which of the following is the correct isolation factor? A. 0 B. 0.5 C. 0.25 D. Infinite
Last Answer : D. Infinite
Description : In measuring critical speed of shaft experiment, it was found that the frequency ratio is 0.707 when the eccentricity is 0.05 m. what will be the displacement of the system. A. 0.05 m B. 0.005 m C. 0.5 m D. Infinite
Last Answer : A. 0.05 m
Description : If the damper is not provided and the system is in resonance, which of the following is the correct isolation factor?(A) 0 (B) 0.5 (C) 0.25 (D) Infinite
Last Answer : (D) Infinite
Description : If the mass of the constraint is negligible then what is the kinetic energy of the system? a) 0 b) Half the value c) Double the value d) Infinite
Last Answer : a) 0
Description : Semi definite system having one of their natural frequency equal to A) Four B) Three C) Two D) Zero
Last Answer : D) Zero
Description : If ωmax is the frequency at which the peak amplitude occurs and ωn is the natural frequency of the system then In a forced vibration system with damping, the higher the damping, A) More will be ... and ωmax is independent of damping in this system D) The difference between ωn and ωmax will be zero
Last Answer : A) More will be the difference between ωn and ωmax
Description : When the frequency of external exciting force is equal to the natural frequency of the vibration of the system A. The amplitude of vibration is zero B. The amplitude of vibration is significantly small C. The amplitude of vibration is very large D. The amplitude does not change
Last Answer : C. The amplitude of vibration is very large
Description : In case of a cantilever beam, shear force at the fixed end will be (a) Maximum (b) Minimum (c) Zero (d) None
Last Answer : (a) Maximum
Description : In case of a cantilever beam, bending moment at the fixed end will be (a) Maximum (b) Minimum (c) Zero (d) None
Description : In case of a cantilever beam, bending moment at the free end will be (a) Maximum (b) Minimum (c) Zero (d) None
Last Answer : c) Zero
Description : The number of degrees of freedom in simple spring mass system is A. Zero B. One C. Two D. Three
Last Answer : B. One
Description : The resultant motion of two Simple Harmonic Motions will be A. Simple Harmonic MotionB. Periodic Motion C. Projectile Motion D. Zero
Last Answer : A. Simple Harmonic Motion
Description : What is meant by critical damping coefficient? * 1 point (A) Frequency of damped free vibrations is less than zero (B). The motion is a periodic in nature (C). Both a. and b. (D). None of the above
Last Answer : (C). Both a. and b.
Description : In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be A less than unity B equal to unity C greater than unity D zero
Last Answer : C greater than unity
Description : What is meant by critical damping coefficient? A Frequency of damped free vibrations is less than zero B The motion is aperiodic in nature C Both a. and b. D None of the above
Last Answer : B The motion is aperiodic in nature
Description : Which of the following statements is/are true? A. Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction B. Shaft vibrates with maximum frequency when rotors ... C. Zero node behavior is observed in rotors rotating in opposite direction D. All of the above
Last Answer : A. Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction
Description : What is meant by node point? A. The point at which amplitude of vibration is maximum B. The point at which amplitude of vibration is minimum C. The point at which amplitude of vibration is zero D. None of the above
Last Answer : C. The point at which amplitude of vibration is zero
Description : Dynamic vibration absorber is suitable for A varying speed machines B constant speed machines C Zero speed range machines D None of the mentioned
Last Answer : B constant speed machines
Description : A system is said to be over damped if the damping factor for the system is A More than one B Less than one C Equal to one D Equal to zero
Last Answer : A More than one
Description : A system is said to be under damped if the damping factor for the system is A More than one B Less than one C Equal to one D Equal to zero
Last Answer : B Less than one
Description : A system is said to be critically damped if the damping factor for a vibrating system is A Zero B Less than one C One D More than one
Last Answer : C One
Description : In energy method for finding frequency of the system A The sum of kinetic and potential energy is constant B The sum of kinetic and potential energy is zero C Frequency cannot be determined by energy method D None of the mentioned
Last Answer : A The sum of kinetic and potential energy is constant
Description : When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to A. Zero B. One C. π/2 D. 2π
Description : At which frequency ratio, phase angle increases as damping factor increases? A. When frequency ratio is less than unity B. When frequency ratio is more than unity C. When frequency ratio is zero D. All of the above
Last Answer : A. When frequency ratio is less than unity
Description : As per Energy Method, the summation of kinetic energy and potential energy must be ________ which is same at all the times. A. zero B. minimum C. maximum D. constant
Last Answer : D. constant