SHS 311 EXAM 1 QUESTIONS WITH CORRECT ANSWERS 2026

SHS 311 EXAM 1 QUESTIONS WITH CORRECT
ANSWERS 2026
1. What does the mass and spring represent in explaining a vibration?-ANSWER- Mass

represents inertia, spring represents elasticity

2. What is the equation for a sinusoidal vibration and what are the three para

meters in the equation?-ANSWER- D(t)=Asin(2pi*f*t + theta)

3. Cycle-ANSWER- A pattern of vibration that repeats itself

4. Period-ANSWER- Time it takes to complete one cycle (pay attention to the units)

5. Frequency-ANSWER- The reciprocal of the period, number of cycles per second

Period in s, frequency in Hz--> frequency=1/period

Period in msec, frequency in Hz-->

frequency=1000/period

6. Peak amplitude-ANSWER- The maximum vibration distance in the positive direction

7. Peak-to-peak amplitude-ANSWER- The difference between the positive and negative peaks

8. Starting Phase-ANSWER- The starting position of a vibration relative to a reference starting
point, 360 degrees

9. RMS amplitude-ANSWER- Since the simple average amplitude (d1) of a waveform is squared
(s), then the mean (m)

of these squared amplitudes is computed and the square root (r) is computed yielding the rms
(root-mean-square)

amplitude

time 0, 0.5, 1, 1,5

amplitude 0,5,0,-5

=0,25,0,25

25+25=50/4=12.5 sqrt12.5