When preparing a 90-V AC equipment for a routine maintenance IR test, at what voltage should...
When preparing a 90-V AC equipment for a routine maintenance IR test, at what voltage should it be tested?
A.
Between 500 V and 1000 V (AC)
B.
Between 500 V and 1000 V (DC)
C.
Between 1 kV and 2.5 kV (AC)
D.
Between 1 kV and 2.5 kV (DC)
E.
Between 100 V and 250 V (DC)
F.
Between 100 V and 250 V (AC)
whats solution to this?
Homework Answers
IR test means the insulation resistance test. The recommended test voltage is tabulated below:
| Equipment AC rating | Test Voltage |
| Up to 100V | 100 V(DC) and 250V(DC) |
| 440V to 550V | 500 V(DC) and 1000V(DC) |
| 2400V | 1000 V(DC) to 2000V(DC) and higer |
| 4160V and above | 100 V(DC) and 5000V(DC) and higher |
So from the above table we can conclude that for 90V AC rated equipment, IR test should be done with test voltage of 100V and 250 V DC. So correct oprion is (E).
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8-1a. 140, 220 Hz
8-1b. 40:0, 62:0 mA
8-2a. 70:0, 99:0 V
8-2b. 140:0, 160:0 V
8-2c. 60:0, 99:0 V
8-2d. 60:0, 90:0 V
8-3a. 40:0; 99:0 pF
8-3b. 100; 400 mV
8-3c. 1:00; 3:00 mV
8-4a. 100; 150 V...
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OPERATIONAL AMPLIFIER AND BJTs.
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Accuracy is important. Do not round intermediates and check the
answer range to make sure you are correct.
Values:
[01] 2.08 [02]
68.47 [03] 0.239 [04] 1173.7 [05] 1403. [06] 53.8
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8-1a. 140, 220 Hz
8-1b. 40:0, 62:0 mA
8-2a. 70:0, 99:0 V
8-2b. 140:0, 160:0 V
8-2c. 60:0, 99:0 V
8-2d. 60:0, 90:0 V
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8-3c. 1:00; 3:00 mV
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