ATT Comp Study Guide– 2026/2027 Edition
– 93 Questions with 100% Verified Correct
Answers
93 Questions with Step-by-Step Answers | 100% Verified | A+ Graded Review
INTRODUCTION:
ATT comp study guide provides a structured review of essential electrical and electronic
principles required for safe and competent performance. It begins with safety fundamentals
including electric shock severity, current thresholds, protection devices, fire classifications and
emergency response procedures. The guide then builds mathematical fluency through scientific
notation, powers of ten conversions and metric prefix applications vital for circuit analysis.
Subsequent sections cover practical troubleshooting of opens, shorts and changed values, fuse
and breaker operation and fault isolation. Finally it examines AC concepts including frequency,
period, wavelength, oscilloscope measurements, transformers, power supply stages, relay
maintenance, IC failures and cooling systems.
Answers are in bold Green, with rationales after.
1. What is NOT a primary factor in severity of an electric shock?
A. Amount of current
B. General health of the victim
C. Path of current through body
D. Duration of shock
Rationale: Primary factors are current magnitude, voltage, resistance, path, and time.
General health affects outcome but is not considered a primary electrical factor.
2. What is the minimum AC current normally required to cause severe muscular
contractions?
A. 1 milliamp
B. 5 milliamps
C. 12 milliamps
, D. 100 milliamps
Rationale: 1mA is perception, 5mA is pain, 10-20mA range is let-go threshold where
severe muscular contraction / can't let go occurs. 12mA is standard reference.
3. Are capacitors circuit protection devices?
A. Yes, they always protect against shorts
B. Yes, they are fuses
C. No
D. Yes, they are primary protection
Rationale: Capacitors store energy and filter, they are not designed to open a circuit on
overcurrent like fuses, breakers, or fusible links.
4. What should you do FIRST if someone has been shocked?
A. Start CPR immediately
B. Call 911
C. Remove the victim from the source
D. Cover burns
Rationale: You must de-energize or isolate the victim from the live source first to
prevent yourself from becoming a second victim.
5. What category includes electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Rationale: Class C is for energized electrical equipment. Class A = ordinary
combustibles, B = flammable liquids, D = combustible metals.
6. What type of protection is worn when use of a tool produces sparks and
debris?
A. Ear plugs
B. Gloves only
C. Safety goggles
D. Dust mask
Rationale: Impact hazard to eyes from flying particles/sparks requires ANSI-approved
eye protection - safety goggles/glasses.
7. What is the exponent for 1,000,000?
A. 10 to the 5th power
B. 10 to the 6th power
C. 10 to the 7th power
D. 10 to the 3rd power
Rationale: 1,000,000 = 1 followed by 6 zeros = 10^6.
8. What is 770,000 in powers of 10?
A. 7.7 x 10 to the 4th
B. 77 x 10 to the 5th
C. 7.7 x 10 to the 5th
D. 7.7 x 10 to the 6th
Rationale: Move decimal 5 places left: 770,000 = 7.7 x 100,000 = 7.7 x 10^5.
9. Convert 27000 to the power of 10
A. 27 x 10 to the 3rd
– 93 Questions with 100% Verified Correct
Answers
93 Questions with Step-by-Step Answers | 100% Verified | A+ Graded Review
INTRODUCTION:
ATT comp study guide provides a structured review of essential electrical and electronic
principles required for safe and competent performance. It begins with safety fundamentals
including electric shock severity, current thresholds, protection devices, fire classifications and
emergency response procedures. The guide then builds mathematical fluency through scientific
notation, powers of ten conversions and metric prefix applications vital for circuit analysis.
Subsequent sections cover practical troubleshooting of opens, shorts and changed values, fuse
and breaker operation and fault isolation. Finally it examines AC concepts including frequency,
period, wavelength, oscilloscope measurements, transformers, power supply stages, relay
maintenance, IC failures and cooling systems.
Answers are in bold Green, with rationales after.
1. What is NOT a primary factor in severity of an electric shock?
A. Amount of current
B. General health of the victim
C. Path of current through body
D. Duration of shock
Rationale: Primary factors are current magnitude, voltage, resistance, path, and time.
General health affects outcome but is not considered a primary electrical factor.
2. What is the minimum AC current normally required to cause severe muscular
contractions?
A. 1 milliamp
B. 5 milliamps
C. 12 milliamps
, D. 100 milliamps
Rationale: 1mA is perception, 5mA is pain, 10-20mA range is let-go threshold where
severe muscular contraction / can't let go occurs. 12mA is standard reference.
3. Are capacitors circuit protection devices?
A. Yes, they always protect against shorts
B. Yes, they are fuses
C. No
D. Yes, they are primary protection
Rationale: Capacitors store energy and filter, they are not designed to open a circuit on
overcurrent like fuses, breakers, or fusible links.
4. What should you do FIRST if someone has been shocked?
A. Start CPR immediately
B. Call 911
C. Remove the victim from the source
D. Cover burns
Rationale: You must de-energize or isolate the victim from the live source first to
prevent yourself from becoming a second victim.
5. What category includes electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Rationale: Class C is for energized electrical equipment. Class A = ordinary
combustibles, B = flammable liquids, D = combustible metals.
6. What type of protection is worn when use of a tool produces sparks and
debris?
A. Ear plugs
B. Gloves only
C. Safety goggles
D. Dust mask
Rationale: Impact hazard to eyes from flying particles/sparks requires ANSI-approved
eye protection - safety goggles/glasses.
7. What is the exponent for 1,000,000?
A. 10 to the 5th power
B. 10 to the 6th power
C. 10 to the 7th power
D. 10 to the 3rd power
Rationale: 1,000,000 = 1 followed by 6 zeros = 10^6.
8. What is 770,000 in powers of 10?
A. 7.7 x 10 to the 4th
B. 77 x 10 to the 5th
C. 7.7 x 10 to the 5th
D. 7.7 x 10 to the 6th
Rationale: Move decimal 5 places left: 770,000 = 7.7 x 100,000 = 7.7 x 10^5.
9. Convert 27000 to the power of 10
A. 27 x 10 to the 3rd
