NACE CP2 CORRECT EXAMS ANSWERS AND
QUESTIONS SURE A+
✔✔Which of the following DC power supplies are commonly used to charge batteries
that in turn provide cathodic protection current?
I. thermoelectric genorators
II. solar
III. wind-driven generator
IV. saturable reactor - ✔✔II and III only
✔✔A transformer will
A. change AC to DC
B. increase the DC voltage only
C. decrease the ac voltage only
D. increase or decrease the AC supply voltage - ✔✔D. increase or decrease the AC
supply voltage
✔✔If the primary AC voltage is 100 Volts AC, and there are 100 primary windings with
200 secondary windings, what is the the secondary voltage?
A. 25 volts AC
B. 50 Volts AC
c. 100 volts AC
d. 200 Volts AC - ✔✔d. 200 Volts AC
(100 x 200) / 100 = 200 volts AC
✔✔With a single diode installed in series with an AC voltage source the results will be
a. half wave AC voltage
b. halfwave DC voltage
c. full wave AC voltage
d. full wave DC voltage - ✔✔b. halfwave DC voltage
, ✔✔full wave rectification can be achieved with
I. a four diode bridge circuit.
II. a center tap configuration.
III. one silicon-controlled rectifier
IV. two silicon-controlled rectifiers and two diodes in a bridge - ✔✔I, II, and IV only
✔✔what is the purpose of a "free wheeling" diode?
a. to prevent latching of the SCR
b. to improve efficiency of the rectifier
c. to convert AC to DC
d. to increase or decrease the AC voltage - ✔✔a. to prevent latching of the SCR ???
✔✔the advantage of three phase rectifiers over single phase rectifiers is that they
a. are more efficient
b. have lower initial cost
c. are easier to troubleshoot
d. are easier to adjust - ✔✔a. are more efficient
✔✔which DC power supply converts heat energy directly to electrical energy?
a. transformer-rectifier
b.solar
c. thermoelectric generator
d.wind-driven generator - ✔✔c. thermoelectric generator
✔✔a constant potential rectifier provides a constant
a. voltage output
b. voltages between taps
c. structure-to-electrolyte potential
d. potential to the SCR - ✔✔c. structure-to-electrolyte potential
✔✔a structure-to-electrolyte potential measures the potential difference between
a. two different structures acting as electrodes
b. the structure and a standard reference electrode
c. the structure and the anode
d. two different points on the structure - ✔✔b. the structure and a standard reference
electrode
QUESTIONS SURE A+
✔✔Which of the following DC power supplies are commonly used to charge batteries
that in turn provide cathodic protection current?
I. thermoelectric genorators
II. solar
III. wind-driven generator
IV. saturable reactor - ✔✔II and III only
✔✔A transformer will
A. change AC to DC
B. increase the DC voltage only
C. decrease the ac voltage only
D. increase or decrease the AC supply voltage - ✔✔D. increase or decrease the AC
supply voltage
✔✔If the primary AC voltage is 100 Volts AC, and there are 100 primary windings with
200 secondary windings, what is the the secondary voltage?
A. 25 volts AC
B. 50 Volts AC
c. 100 volts AC
d. 200 Volts AC - ✔✔d. 200 Volts AC
(100 x 200) / 100 = 200 volts AC
✔✔With a single diode installed in series with an AC voltage source the results will be
a. half wave AC voltage
b. halfwave DC voltage
c. full wave AC voltage
d. full wave DC voltage - ✔✔b. halfwave DC voltage
, ✔✔full wave rectification can be achieved with
I. a four diode bridge circuit.
II. a center tap configuration.
III. one silicon-controlled rectifier
IV. two silicon-controlled rectifiers and two diodes in a bridge - ✔✔I, II, and IV only
✔✔what is the purpose of a "free wheeling" diode?
a. to prevent latching of the SCR
b. to improve efficiency of the rectifier
c. to convert AC to DC
d. to increase or decrease the AC voltage - ✔✔a. to prevent latching of the SCR ???
✔✔the advantage of three phase rectifiers over single phase rectifiers is that they
a. are more efficient
b. have lower initial cost
c. are easier to troubleshoot
d. are easier to adjust - ✔✔a. are more efficient
✔✔which DC power supply converts heat energy directly to electrical energy?
a. transformer-rectifier
b.solar
c. thermoelectric generator
d.wind-driven generator - ✔✔c. thermoelectric generator
✔✔a constant potential rectifier provides a constant
a. voltage output
b. voltages between taps
c. structure-to-electrolyte potential
d. potential to the SCR - ✔✔c. structure-to-electrolyte potential
✔✔a structure-to-electrolyte potential measures the potential difference between
a. two different structures acting as electrodes
b. the structure and a standard reference electrode
c. the structure and the anode
d. two different points on the structure - ✔✔b. the structure and a standard reference
electrode
