Question

9. If an electrical system operates at a potential higher than 600 volts, the nonmetallic conduit must be encased in at least of concrete. a. 1 inch b. 2 inches c. 4 inches d. 6 inches 10. Which of the following is the correct equation for calculating the rated current for a single-phase transformer? a. $I = \frac{VA}{E}$ b. $I = \frac{E}{SC}$ c. $I = \frac{A}{E}$ d. $I = \frac{E \times Z}{E}$ 11. For a transformer rated 1000 volts or less, if the primary current is less than 2 amperes the short-circuit protective device can be set at not more than of this value. a. 167% b. 225% c. 265% d. 300% 12. When will the var-hour meter disk rotate in one direction for a lagging current and in the opposite direction for a leading current? a. always b. never c. if the power factor is unity d. if the power factor falls below unity 13. In a typical telephone service installation, a dry well is constructed beneath the a. weep hole b. pole cap c. pole d. junction box 7

          9.
If an electrical system operates at a potential higher than 600 volts, the nonmetallic
conduit must be encased in at least ____ of concrete.
a. 1 inch
b. 2 inches
c. 4 inches
d. 6 inches
10. Which of the following is the correct equation for calculating the rated current for
a single-phase transformer?
a. $I = \frac{VA}{E}$
b. $I = \frac{E}{SC}$
c. $I = \frac{A}{E}$
d. $I = \frac{E \times Z}{E}$
11. For a transformer rated 1000 volts or less, if the primary current is less than 2
amperes the short-circuit protective device can be set at not more than ____
of this value.
a. 167%
b. 225%
c. 265%
d. 300%
12. When will the var-hour meter disk rotate in one direction for a lagging current and
in the opposite direction for a leading current?
a. always
b. never
c. if the power factor is unity
d. if the power factor falls below unity
13. In a typical telephone service installation, a dry well is constructed beneath the ____
a. weep hole
b. pole cap
c. pole
d. junction box
7

9.
If an electrical system operates at a potential higher than 600 volts, the nonmetallic
conduit must be encased in at least of concrete.
a. 1 inch
b. 2 inches
c. 4 inches
d. 6 inches
10. Which of the following is the correct equation for calculating the rated current for
a single-phase transformer?
a. I = (VA)/(E)
b. I = (E)/(SC)
c. I = (A)/(E)
d. I = (E × Z)/(E)
11. For a transformer rated 1000 volts or less, if the primary current is less than 2
amperes the short-circuit protective device can be set at not more than
of this value.
a. 167%
b. 225%
c. 265%
d. 300%
12. When will the var-hour meter disk rotate in one direction for a lagging current and
in the opposite direction for a leading current?
a. always
b. never
c. if the power factor is unity
d. if the power factor falls below unity
13. In a typical telephone service installation, a dry well is constructed beneath the
a. weep hole
b. pole cap
c. pole
d. junction box
7

Added by Kevin V.

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