Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. |
The formula for WORK is:
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a. |
W= F x D |
c. |
HP= P/550 |
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b. |
P= W/T |
d. |
T = F x R |
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2. |
The formula for Power is:
|
a. |
W= F x D |
c. |
HP= P/550 |
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b. |
P= W/T |
d. |
T = F x R |
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3. |
The formula for Horsepower is:
|
a. |
W= F x D |
c. |
HP= P/550 |
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b. |
P= W/T |
d. |
T = F x R |
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4. |
The formula for Torque is:
|
a. |
W= F x D |
c. |
HP= P/550 |
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b. |
P= W/T |
d. |
T = F x R |
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5. |
A hoist lifting 250 LB 35 feet in 10 seconds must produce _____ horsepower.
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a. |
1.59 |
c. |
8750 |
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b. |
875 |
d. |
15.9 |
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6. |
A hoist lifting 250 LB 35 feet in 10 seconds must do _____ ft-lb of work.
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a. |
1.59 |
c. |
8750 |
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b. |
875 |
d. |
15.9 |
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7. |
A hoist lifting 750 LB 35 feet in 10 seconds must produce _____ horsepower.
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a. |
1.59 |
c. |
8750 |
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b. |
875 |
d. |
4.772 |
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8. |
The synchronous speed of a 4 pole motor operating on 60 hz power is ______ RPM
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a. |
3600 |
c. |
1746 |
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b. |
1800 |
d. |
900 |
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9. |
The synchronous speed of a 4 pole motor operating on 60 hz power with 3% slip is ______ RPM
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a. |
3600 |
c. |
1746 |
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b. |
1800 |
d. |
900 |
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10. |
If a motor has 20 ohms of inductive reactance at 60 hz what will the current be if the frequency is reduced to 30 hz (50% speed) if the voltage is 480 volts, not adjusted with the frequency? (assuming resistance is a negligible factor)
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11. |
Voltages should be within 10% of nameplate and balanced within ____ % at the line terminals of the ASD.
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a. |
5% |
c. |
10% |
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b. |
2% |
d. |
99.9% |
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12. |
A ____ % phase imbalance will cause a 10% reduction in rated horsepower
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13. |
A 3 % phase imbalance will cause a ____ % reduction in rated horsepower
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14. |
A 2 % phase imbalance will cause a ______ % current imbalance.
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15. |
A______ reduces reflective wave currents and harmonic distortion in the motor.
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a. |
line reactor |
c. |
PF correction capacitors |
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b. |
load reactor |
d. |
Internal DC filters |
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16. |
A______ protects the drive from motor winding produced spikes.
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a. |
line reactor |
c. |
PF correction capacitors |
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b. |
load reactor |
d. |
Internal DC filters |
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17. |
A ______ reduces Total Harmonic Distortion on the power lines.
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a. |
line reactor |
c. |
PF correction capacitors |
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b. |
load reactor |
d. |
Internal DC filters |
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18. |
A ______ dampens transients from power factor correction capacitors.
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a. |
line reactor |
c. |
PF correction capacitors |
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b. |
load reactor |
d. |
Internal DC filters |
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19. |
A ______ smooths the ripple voltage provided to the inverter section.
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a. |
line reactor |
c. |
PF correction capacitors |
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b. |
load reactor |
d. |
Internal DC filter |
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20. |
PWM drives will typically produce voltage spikes up to _____ times the DC bus voltage with each switching action.
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a. |
1.25 |
c. |
1.0 |
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b. |
2 |
d. |
10 |
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21. |
Inverter or _____ duty motors are needed for ASD’s because of voltage spikes caused by the drive.
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a. |
hyper |
c. |
continuous |
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b. |
service |
d. |
vector |
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22. |
Vector duty motors are needed with ASD’s because of drive generated voltage spikes of up to ______ times the _____ voltage.
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a. |
1.25, line |
c. |
2, rated |
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b. |
2, line |
d. |
2, DC bus |
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23. |
During an upload information is moved from the _______ to the _______ .
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a. |
panel, drive |
c. |
drive, panel |
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b. |
user, database |
d. |
database, user |
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24. |
During a download information is moved from the _______ to the _______ .
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a. |
panel, drive |
c. |
drive, panel |
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b. |
user, database |
d. |
database, user |
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25. |
If a stop command is recieved, and the drive is programmed to de-energize the output immediately this would be called a(n) _______ stop.
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a. |
ramping |
c. |
jogging |
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b. |
coasting |
d. |
emergency |
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26. |
If a stop command is recieved, and the drive is programmed to de-energize the output after decreasing speed for a predetermined time this would be called a(n) _______ stop.
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a. |
ramping |
c. |
jogging |
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b. |
coasting |
d. |
emergency |
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