HVAC ELECTRICAL ESCO QUESTIONS
AND CORRECT ANSWERS
Any material that will readily release electron called:
a. An insulator.
b. conductor.
c. A resistance.
d. A neutron. ANSW✅✅b. conductor.
Which of the following materials would be best suited for use as a semi-conductor?
a. Copper.
b. Bakelite.
C. Aluminum.
d. Silicon. ANSW✅✅d. Silicon.
Which of the following is generally considered to be within the maximum allowable (plus or minus)
supply voltage variation?
a. 5%.
b. 15%.
C. 20%.
d. 30%. ANSW✅✅a. 5%.
In electrical wiring, a black colored wire in an alternating current circuit usually indicates:
a. The hot conductor.
b. The neutral conductor.
C. The ground conductor.
d. The safety conductor. ANSW✅✅a. The hot conductor.
,Fuses are sized by:
a. Amps & watts.
b. Volts & watts.
C. Watts & ohms.
d. Volts & amps. ANSW✅✅d. Volts & amps.
What would be the result, if a 24 volt, 20 - ohm low voltage contactor coil were wired in series with a
24 volt, 200-ohm control relay coil?
a. Neither the contactor nor control relay would operate.
b. Only the control relay would operate.
c. Only the contactor would operate.
d. Both the contactor and control relay would operate. ANSW✅✅c. Only the contactor would
operate.
What is the term used to describe the output side of a transformer?
a. Low inductive side.
b. High inductive side.
c. Primary side.
d. Secondary side. ANSW✅✅d. Secondary side.
One horsepower is equal to
a. 3415.
b. 746.
c. 1200.
d. 208. ANSW✅✅b. 746.
, The total resistance of a parallel circuit will be:
a. The sum of all resistance.
b. Equal to the largest resistance.
c. Equal to the smallest resistance.
d. Less than the smallest resistance. ANSW✅✅d. Less than the smallest resistance.
Which of the following statements about current is true?
a. Current flow is the same as voltage.
b. Current flow will increase when voltage increases.
c. Current flow will increase when resistance increases.
d. Current flow will decrease when voltage increases. ANSW✅✅b. Current flow will increase when
voltage increases.
When resistors are wired in parallel:
a. The current through any one resistor will be the same as the total circuit current.
b. The voltage drop across each resistor will be the same as the applied source voltage.
C. The voltage drop across each resistor will depend on the value of each resistor.
d. The total resistance is determined by adding the values of each resistor ANSW✅✅b. The
voltage drop across each resistor will be the same as the applied source voltage.
A capacitor analyzer is designed to read:
a. The percentage of leakage.
b. The capacitor voltage.
c. The capacitive resistance of a capacitor.
d. The capacitance of a capacitor. ANSW✅✅d. The capacitance of a capacitor.
On an electronic oil safety switch what changes the pressure signal to electrical signal.
AND CORRECT ANSWERS
Any material that will readily release electron called:
a. An insulator.
b. conductor.
c. A resistance.
d. A neutron. ANSW✅✅b. conductor.
Which of the following materials would be best suited for use as a semi-conductor?
a. Copper.
b. Bakelite.
C. Aluminum.
d. Silicon. ANSW✅✅d. Silicon.
Which of the following is generally considered to be within the maximum allowable (plus or minus)
supply voltage variation?
a. 5%.
b. 15%.
C. 20%.
d. 30%. ANSW✅✅a. 5%.
In electrical wiring, a black colored wire in an alternating current circuit usually indicates:
a. The hot conductor.
b. The neutral conductor.
C. The ground conductor.
d. The safety conductor. ANSW✅✅a. The hot conductor.
,Fuses are sized by:
a. Amps & watts.
b. Volts & watts.
C. Watts & ohms.
d. Volts & amps. ANSW✅✅d. Volts & amps.
What would be the result, if a 24 volt, 20 - ohm low voltage contactor coil were wired in series with a
24 volt, 200-ohm control relay coil?
a. Neither the contactor nor control relay would operate.
b. Only the control relay would operate.
c. Only the contactor would operate.
d. Both the contactor and control relay would operate. ANSW✅✅c. Only the contactor would
operate.
What is the term used to describe the output side of a transformer?
a. Low inductive side.
b. High inductive side.
c. Primary side.
d. Secondary side. ANSW✅✅d. Secondary side.
One horsepower is equal to
a. 3415.
b. 746.
c. 1200.
d. 208. ANSW✅✅b. 746.
, The total resistance of a parallel circuit will be:
a. The sum of all resistance.
b. Equal to the largest resistance.
c. Equal to the smallest resistance.
d. Less than the smallest resistance. ANSW✅✅d. Less than the smallest resistance.
Which of the following statements about current is true?
a. Current flow is the same as voltage.
b. Current flow will increase when voltage increases.
c. Current flow will increase when resistance increases.
d. Current flow will decrease when voltage increases. ANSW✅✅b. Current flow will increase when
voltage increases.
When resistors are wired in parallel:
a. The current through any one resistor will be the same as the total circuit current.
b. The voltage drop across each resistor will be the same as the applied source voltage.
C. The voltage drop across each resistor will depend on the value of each resistor.
d. The total resistance is determined by adding the values of each resistor ANSW✅✅b. The
voltage drop across each resistor will be the same as the applied source voltage.
A capacitor analyzer is designed to read:
a. The percentage of leakage.
b. The capacitor voltage.
c. The capacitive resistance of a capacitor.
d. The capacitance of a capacitor. ANSW✅✅d. The capacitance of a capacitor.
On an electronic oil safety switch what changes the pressure signal to electrical signal.
