Course 1-1: Pre-Test
Course 1-1: Pre-Quiz
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Categories
- Convert to Cycles with Different References 0%
- Convert to Seconds with Generated Frequency 0%
- Convert to Seconds with Nominal Freq 0%
- Counting Cycles 0%
- Counting Cycles with Different Images 0%
- Determine Phase Rotation 0%
- Determine Relay Frequency Reference 0%
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Question 1 of 14
1. Question
How many cycles are shown in the following diagram?
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Question 2 of 14
2. Question
How many cycles are shown in the following diagram?
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Question 3 of 14
3. Question
Click on the the image that has 9 cycles and click the “Check” button.
CorrectIncorrectHint
Count the peaks in each image and then select the correct answer.
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Question 4 of 14
4. Question
Click on the the image that has 10 cycles and click the “Check” button.
CorrectIncorrectHint
Count the peaks in each image and then select the correct answer.
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Question 5 of 14
5. Question
Is this an A-B-C or A-C-B 3-phase system?
CorrectIncorrectHint
Pretend the waveforms are scrolling from right to left. In what order will the phases cross the y-axis?
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Question 6 of 14
6. Question
Is this an A-B-C or A-C-B 3-phase system?
CorrectIncorrectHint
Pretend the waveforms are scrolling from right to left. In what order will the phases cross the y-axis?
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Question 7 of 14
7. Question
You have performed two timing tests to to find out what reference the test-set’s cycle timer uses.
- Test #1: The relay operates in 3.96 seconds and the test-set timer displays 225.72 cycles at 57 Hz.
- Test #2: The relay operates in 3.94 seconds and the test set displays 220.8 cycles at 56 Hz.
Use the following formulas and your calculator to figure out what reference the test-set uses to count cycles?
CorrectIncorrect -
Question 8 of 14
8. Question
You want to find out what reference the relay’s cycle timer uses and perform two timing tests.
- Test #1: The relay operates in 2.01 seconds at 57 Hz.
- Test #2: The relay operates in 2.01 seconds at 56 Hz.
Use the following formulas and your calculator to figure out what reference the relay uses to count cycles?
CorrectIncorrect -
Question 9 of 14
9. Question
Use the following formulas and your calculator to figure out the expected time-to-trip in seconds if the relay uses the Nominal System Frequency as a reference? (Enter 3 decimal places, for example 1.234)
Nominal System Frequency [NSF] = 50 Hz
Relay Setting (Cycles) = 10 cycles
Relay Reference = NSF
Test-Set Reference = NSF
Generated Frequency (Hz) [GF] = 56.3 Hz
CorrectIncorrectHint
Use the correct formula and the Nominal System Frequency to calculate the answer.
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Question 10 of 14
10. Question
Use the following formulas and your calculator to figure out the expected time-to-trip in cycles if the relay uses the Generated Frequency as its reference and your test-set uses the Nominal System Frequency as its reference? (Enter 3 decimal places, for example 1.234)
Nominal System Frequency [NSF] = 50 Hz
Relay Setting (Cycles) = 45 cycles
Relay Reference = GF
Test-Set Reference = NSF
Generated Frequency (Hz) [GF] = 47.3 Hz
CorrectIncorrectHint
Use the correct formula and the Generated Frequency to calculate the answer in seconds. Then use the correct formula and Nominal System Frequency to convert seconds to cycles.
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Question 11 of 14
11. Question
Use the following formulas and your calculator to figure out the expected time-to-trip in seconds if the relay uses the Generated Frequency as its reference? (Enter 3 decimal places, for example 1.234)
Nominal System Frequency [NSF] = 60 Hz
Relay Setting (Cycles) = 1800 cycles
Relay Reference = GF
Test-Set Reference = GF
Generated Frequency (Hz) [GF] = 61.6 Hz
CorrectIncorrectHint
Use the correct formula and the Generated Frequency to calculate the answer. Submit your answer with 3 decimal places.
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Question 12 of 14
12. Question
Use the following formulas and your calculator to figure out the expected time-to-trip in seconds if the relay uses the Generated Frequency as its reference? (Enter 3 decimal places, for example 1.234)
Nominal System Frequency [NSF] = 50 Hz
Relay Setting (Cycles) = 1800 cycles
Relay Reference = GF
Test-Set Reference = GF
Generated Frequency (Hz) [GF] = 51.6 Hz
CorrectIncorrectHint
Use the correct formula and the Generated Frequency to calculate the answer. Submit your answer with 3 decimal places.
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Question 13 of 14
13. Question
Use the following formulas and your calculator to figure out the expected time-to-trip in seconds if the relay uses the Nominal System Frequency as a reference? (Enter 3 decimal places, for example 1.234)
Nominal System Frequency [NSF] = 60 Hz
Relay Setting (Cycles) = 45 cycles
Relay Reference = NSF
Test-Set Reference = NSF
Generated Frequency (Hz) [GF] = 57.3 Hz
CorrectIncorrectHint
Use the correct formula and the Nominal System Frequency to calculate the answer.
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Question 14 of 14
14. Question
Use the following formulas and your calculator to figure out the expected time-to-trip in cycles if the relay uses the Nominal System Frequency as its reference and your test-set uses the Generated Frequency as its reference? (Enter 3 decimal places, for example 1.234)
Nominal System Frequency [NSF] = 60 Hz
Relay Setting (Cycles) = 600 cycles
Relay Reference = NSF
Test-Set Reference = GF
Generated Frequency (Hz) [GF] = 61.7 Hz
CorrectIncorrectHint
Use the correct formula and the Nominal System Frequency to calculate the answer in seconds. Then use the correct formula and Generated Frequency to convert seconds to cycles. Submit your answer with 3 decimal places.