1. Why is the modern power distribution system based on AC power as opposed to DC power?
a. AC power uses transformers to step up the voltage in a power transmission line and thereby reduce the current to reduce line voltage drop.
b. DC power systems were operated at too many different voltages.
c. DC power could be provided over one square mile.
d. AC power is safer.
2. When using a digital multimeter to measure the voltage of a single 1.5 volt AA battery, which one of the following choices is the best range?
a. 2V DC
b. 200 mV DC
c. 20 V DC
d. 2V AC.
3. What technology or device works for AC but not for DC?
a. Transformer
b. Resistors
c. Wires
d. Multimeters
4. Which of the following statements about AC power generation is incorrect?
a. A wind turbine can generate 1-2 megawatts by converting 100% of the kinetic energy of the wind into electrical power.
b.The peak electrical power consumption for the State of Texas has been 70,000 megawatts.
c. One nuclear power generating unit at Comanche Peak Nuclear Power Plant produces a peak power of about 1300 megawatts.
d. Hydroelectric power generators can convert up to 90% of the energy of falling water into electrical power.
5. Why is the modern power distribution system based on AC power instead of DC power?
- AC power is safer.
a. AC power uses transformers to step up the voltage in a power transmission line and thereby reduce the current to reduce line voltage drop.
b. AC power is safer.
c. DC power systems were operated at too many different voltages.
d. DC power could be provided over one square mile.
6. A GFCI AC receptacle in a home trips with the difference between the current in hot wire and the current in the neutral wire is:
a. 0.005 A
b. 15 A
c. 100 mA
d .10 mA
7. A 120-volt AC line in a home has a resistance of 2 ohms for the hot wire and two ohms for the return wire. When a light bulb is switched on, a current of 6 amperes flows in this line. What is the voltage across the light bulb? (Hint: Draw a circuit diagram first.)
a. 96 V
b. 108 V
c. 24 V
d. 120 V
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