1|Page
MEP SYSTEMS I (COSC 325) ELECTRICAL EXAM –
HOUSTON NEWEST ACTUAL EXAM COMPLETE 150
QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A+||NEWEST EXAM!!!
What is a symmetric waveform that contains 360 electrical
degrees? (21-456) - ANSWER-AC Sine Wave
What is one complete positive and negative alteration of a
wave form? (21-456) - ANSWER-Cycle
What is half a Cycle? (21-456) - ANSWER-Alternation
How many Alternations does a Sine Wave have? (21-456)
- ANSWER-2
1 Positive and 1 Negative
______-phase AC Voltage only contains one alternating
voltage waveform. (21-457) - ANSWER-One
______-phase AC Voltage is a combination of three
alternating voltage waveforms, each displaced by 120
electrical degrees (1/3 Cycle) apart. (21-457) - ANSWER-
Three
,2|Page
True or False? Almost any level of AC Voltage is available.
(21-457) - ANSWER-True
What is the value measured from the maximum positive
alternation to the maximum negative alternation? (21-458)
- ANSWER-Peak-to-Peak Value (P p-p)
What is the mathematical mean of all instantaneous
voltage values in the sine wave? (21-458) - ANSWER-
Average Value (V avg) of a Sine Weve
What is the value that produces the same amount of heat
in a pure resistive circuit as a DC current of the same
value? (21-458) - ANSWER-Root-Mean-Square (Effective)
Value (V rms) of a Sine Wave
What is the amount of electrons flowing through an
electrical circuit? (21-459) - ANSWER-Current (I)
What is Current measured in?
It represents the number of electrons passing a given
point in one second. (21-459) - ANSWER-Amperes (A)
, 3|Page
The more power a load requires, the (larger / smaller) the
amount of current flow. (21-459) - ANSWER-Larger
What is a current that flows in only one direction called?
(21-459) - ANSWER-Direct (DC) Current
What is a current that reverses its direction of flow at
regular intervals? (21-459) - ANSWER-Alternating (AC)
Current
What is current flow from positive to negative called? (21-
459) - ANSWER-Conventional Current Flow
What is current flow from negative to positive called? (21-
459) - ANSWER-Electron Current Flow
What is the rate of doing work or using energy? (21-459) -
ANSWER-Power (P)
What is the actual power used in the electrical circuit
called? (21-459) - ANSWER-True Power (P t)
What is the unit of measure for True Power? (21-459) -
ANSWER-Watts (W)
MEP SYSTEMS I (COSC 325) ELECTRICAL EXAM –
HOUSTON NEWEST ACTUAL EXAM COMPLETE 150
QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A+||NEWEST EXAM!!!
What is a symmetric waveform that contains 360 electrical
degrees? (21-456) - ANSWER-AC Sine Wave
What is one complete positive and negative alteration of a
wave form? (21-456) - ANSWER-Cycle
What is half a Cycle? (21-456) - ANSWER-Alternation
How many Alternations does a Sine Wave have? (21-456)
- ANSWER-2
1 Positive and 1 Negative
______-phase AC Voltage only contains one alternating
voltage waveform. (21-457) - ANSWER-One
______-phase AC Voltage is a combination of three
alternating voltage waveforms, each displaced by 120
electrical degrees (1/3 Cycle) apart. (21-457) - ANSWER-
Three
,2|Page
True or False? Almost any level of AC Voltage is available.
(21-457) - ANSWER-True
What is the value measured from the maximum positive
alternation to the maximum negative alternation? (21-458)
- ANSWER-Peak-to-Peak Value (P p-p)
What is the mathematical mean of all instantaneous
voltage values in the sine wave? (21-458) - ANSWER-
Average Value (V avg) of a Sine Weve
What is the value that produces the same amount of heat
in a pure resistive circuit as a DC current of the same
value? (21-458) - ANSWER-Root-Mean-Square (Effective)
Value (V rms) of a Sine Wave
What is the amount of electrons flowing through an
electrical circuit? (21-459) - ANSWER-Current (I)
What is Current measured in?
It represents the number of electrons passing a given
point in one second. (21-459) - ANSWER-Amperes (A)
, 3|Page
The more power a load requires, the (larger / smaller) the
amount of current flow. (21-459) - ANSWER-Larger
What is a current that flows in only one direction called?
(21-459) - ANSWER-Direct (DC) Current
What is a current that reverses its direction of flow at
regular intervals? (21-459) - ANSWER-Alternating (AC)
Current
What is current flow from positive to negative called? (21-
459) - ANSWER-Conventional Current Flow
What is current flow from negative to positive called? (21-
459) - ANSWER-Electron Current Flow
What is the rate of doing work or using energy? (21-459) -
ANSWER-Power (P)
What is the actual power used in the electrical circuit
called? (21-459) - ANSWER-True Power (P t)
What is the unit of measure for True Power? (21-459) -
ANSWER-Watts (W)
