Description : In under damped vibrating system, if x 1 and x 2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to A x 1 /x 2 B log (x 1 /x 2 ) C loge (x 1 /x 2 ) D log (x 1 .x 2 )
Last Answer : C loge (x 1 /x 2 )
Description : Calculate logarithmic decrement if the amplitude of the vibrating body reduces to half in two cycles A 0.346 B 0.693 C 0.301 D 0.150
Last Answer : A 0.346
Description : In under damped vibrating system, if x 1 and x 2 are the successive values of the C amplitude on the same side of the mean position, then the logarithmic decrement is equal to ( A ) x 1 /x 2 ( B ) log (x 1 /x 2 ) ( C ) loge (x 1 /x 2 ) ( D ) log (x 1 .x 2 )
Last Answer : ( C ) loge (x 1 /x 2 )
Description : Determine logarithmic decrement, if the amplitude of a vibrating body reduces to 1/6 th in tw cycles. a. 0.223 b. 0.8958 c. 0.3890 d. None of the above
Last Answer : b. 0.8958
Description : In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to a) x1/x2 b) log (x1/x2) c) ln (x1/x2) d) log (x1.x2)
Last Answer : c) ln (x1/x2)
Description : In under damped vibrating system, if x 1 and x 2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to a) x 1 /x 2 b) log (x 1 /x 2 )c) loge (x 1 /x 2 ) d) log (x 1 .x 2 )
Last Answer : b) log (x 1 /x 2 )
Description : find the value of logarithmic decrement of a vibratory system if its natural frequency is 10rad/sec, its mass is 10kg and its damping constant is 100N.s/m a) 36.27 b)362.7 c)0.3627 d)3.627
Last Answer : d)3.627
Description : The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as A Damping factor B Damping coefficient C Logarithmic decrement D Magnification factor
Last Answer : D Magnification factor
Description : Calculate logarithmic decrement if damping factor is 0.33. A 1.36 B 3.23 C 5.16D 2.19
Last Answer : D 2.19
Description : Calculate logarithmic decrement if damping factor is 0.086 A 0.245 B 0.425 C 0.542 D 0.252
Last Answer : C 0.542
Description : The ratio of the maximum displacement of the forced vibration to the deflection due to the static force is known as A Logarithmic decrement B Magnification factor C Damping factor D None of the mentioned
Last Answer : B Magnification factor
Description : Calculate logarithmic decrement if damping factor is 0.33. D ( A ) 1.36 ( B ) 3.23 ( C ) 5.16 ( D ) 2.19
Last Answer : D ) 2.19
Description : The ratio of maximum displacement of the forced vibration to the deflection due to the static force, is known as A. Damping FactorB. Damping Coefficient C. Logarithmic Decrement D. Magnification Factor
Last Answer : D. Magnification Factor
Description : Calculate logarithmic decrement if damping factor is 0.33. a. 1.36 b. 3.23 c. 5.16 d. 2.19
Last Answer : d. 2.19
Description : The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as a) Damping factor b) Damping coefficient c) Logarithmic decrement d) Magnification factor
Last Answer : d) Magnification factor
Description : The ratio of the maximum displacement of the forced vibration to the deflection due to the static force is known as (A) damping factor (B) damping coefficient (C) logarithmic decrement (D) magnification factor
Last Answer : (D) magnification factor
Description : The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as a) damping factor b) damping coefficient c) logarithmic decrement d) magnification factor
Last Answer : d) magnification factor
Description : Which of the following statements are TRUE for damped vibrations? (P) . For a system having critical damping, the value of the damping ratio is unity and system does not undergo a vibratory motion. (Q) . Logarithmic decrement method ... Q only (B) P and S only (C) P, Q and R only (D) Q and S only
Last Answer : (C) P, Q and R only
Description : When the torsional pendulum vibrating the observed amplitudes on the same side of neutral axis for successive cycles are found to decay 50% of the initial value determine logarithmic decrement. A 0.065 B 0.006 C 0.693 D 0.5
Last Answer : C 0.693
Description : When the torsional pendulum vibrating, the observed amplitudes on the same side of the neutral axis for successive cycles are found to decay 50% of the initial value determine logarithmic decrement. A 0.065 B 0.006 C 0.693 D 0.5
Description : The rate of decay of oscillations is known as....... A. critical damping B. damping coefficient C. transmissibility D. logarithmic decrement
Last Answer : D. logarithmic decrement
Description : Transmissibility in a support excitation system is defined by A) Ratio of absolute amplitude of the mass to the excitation amplitude of the support B) Reciprocal of (a) C) Ratio of the ... the foundation, to the equivalent force corresponding to maximum displacement excitation D) None of the above
Last Answer : B) Reciprocal of (a)
Description : The ratio of actual damping coefficient to the critical damping coefficient is known as A Magnification Factor B Damping Factor C Logarithmic decrementD None of the mentioned
Last Answer : B Damping Factor
Description : When there is a reduction in amplitude over every cycle of vibration, then the body is said to have A Free vibration B Forced vibration C Damped vibration D None of the mentioned
Last Answer : C Damped vibration
Description : According to the untuned dry fraction damper amplitude reduction will be A) Lesser if lesser amount of energy dissipated B) Greater if greater amount of energy dissipated C) Greater if lesser amount of energy dissipated D) Lesser if greater amount of energy dissipated
Last Answer : B) Greater if greater amount of energy dissipated
Description : When there is a reduction in amplitude over every cycle of vibration, then the body is said to have ( A ) Free vibration ( B ) Forced vibration ( C ) Damped vibration ( D ) None of the mentioned
Last Answer : ( C ) Damped vibration
Description : When there is a reduction in amplitude over every cycle of vibration, then the body is said to have a) free vibration b) forced vibration c) damped vibrationd) under damped vibration
Last Answer : c) damped vibration
Description : Reduction in vibration amplitude after one complete cycle of single degree free vibration with dry friction damping is_____, if where F"= frictional force between mass and surface and k =stiffness of the system. a)4F/k a b) 2f/K C) 3F/k D)8F/k
Last Answer : a)4F/k
Description : When there is a reduction in amplitude over every cycle of vibration, then the body is said to have a) free vibration b) forced vibration c) damped vibration d) under damped vibration
Description : When there is a reduction in amplitude over every cycle of vibration, then the body is said to have a) free vibration b) forced vibration c) damped vibration d) none of the mentioned
Description : In damped free vibrations, which parameters indicate vibrations? A) Natural frequency B) Rate of decay of amplitude C) Both a. and b. D) None of the above
Last Answer : C) Both a. and b.
Description : If frequency of excitation of a forced vibration system with negligible damping is very close to natural frequency of the system, then the system will A) Execute harmonic motion of large amplitude B) Beat with a very high peak amplitude C) Perform aperiodic motion D) None of the above
Last Answer : A) Execute harmonic motion of large amplitude
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 damped free vibrations, which parameters indicate vibrations? a. Natural frequency b. Rate of decay of amplitude c. Both a. and b. d. None of the above
Last Answer : c. Both a. and b.
Description : A vibrating system having mass 1kg, a spring of stiffness 1000N/m and damping factor of 0.632 and it is put to harmonic excitation of 10N. Find the amplitude at resonance. A 0.079 B 7.9C 0.056 D 0.00791
Last Answer : D 0.00791
Description : The frame consists of a steel beam welded rigidly to two vertical channels. An eccentric exciter weighing 250 N is attached to the beam, which weighs 10 KN and is used to excite the frame. The unbalance weight of ... ends, magnification factor at resonance is A. 307.5 B. 3.075 C. 30.75 D. 0.3075
Last Answer : C. 30.75
Description : Pick up the incorrect statement from the following: (A) The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water (B) Higher value of pH ... value of pH means higher hydrogen ion contraction (D) Lower value of pH gives alkaline solution
Last Answer : (D) Lower value of pH gives alkaline solution
Description : The reciprocal of the interval of time by a vibrating body to complete a cycle is called A Period B Frequency C Resonance D None of the mentioned
Last Answer : B Frequency
Description : The ratio of the force transmitted to the force applied is known as the ____________ of the spring support. A. isolation factor B. transmissibility ratio C. both A and B D. none of the above
Last Answer : C. both A and B
Description : The ratio of the force transmitted to the force applied is known as the ____________ of the spring support. (A) isolation factor (B) transmissibility ratio (C) both A and B (D) none of the above
Last Answer : (C) both A and B
Description : In damped vibrations, the amplitude of the resulting vibration gradually reduces. This is due to the reason that an amount of energy is always dissipated to overcome the ________ * 1 point (A) Frictional resistance (B) Work done(C) Fluid pressure (D) Air pressure
Last Answer : (A) Frictional resistance
Description : When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as * 1 point (A) simple pendulum (B) torsional pendulum (C) compound pendulum (D) second’s pendulum
Last Answer : (C) compound pendulum
Description : Which of the following instruments measure the amplitude of a vibrating body? (A) Vibrometers (B) Seismometer (C) Both (a) and (b) (D) None of these
Last Answer : (C) Both (a) and (b)
Description : In steady state forced vibrations, the amplitude of vibrations at resonance is _____________ damping coefficient. A equal to B directly proportional to C inversely proportional to D independent of
Last Answer : C inversely proportional to
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 : In above numerical what will be the frequency corresponding to the peak amplitude A 14.18rad/sec B 24.13rad/sec C 20.22rad/sec D 22.32rad/sec
Last Answer : A 14.18rad/sec
Description : During resonance A the Vibrations remains unaffected B no vibration occurs C low amplitude of vibration occurs D high amplitude of vibration occurs
Last Answer : D high amplitude of vibration occurs
Description : In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient. A. Equal to B. Directly proportional to C. Inversely proportional toD. Independent of
Last Answer : C. Inversely proportional to
Description : A single degree of freedom spring-mass system is subjected to a harmonic force of constant amplitude. For an excitation frequency of √3k/m , the ratio of the amplitude of steady state response to the static deflection of the spring is __________ A. 0.2 B. 0.5 C. 0.8 D. None of the above
Last Answer : B. 0.5