ATT Test 3 Study Guide (2025/2026 Syllabus)
Disclaimer: This guide is based on public domain knowledge of the ATT Test's common
subject areas. AT&T does not publish an official public study guide. The exact questions
on the actual test will vary. This guide is designed to reinforce the core concepts and
problem-solving skills required to succeed.
Section 1: Mechanical Concepts
1. Question: If Gear A has 20 teeth and rotates clockwise, and it is meshed with Gear B
which has 40 teeth, which direction will Gear B rotate and how will its speed compare?
ANSWER: ✓ Gear B will rotate counter-clockwise and at half the speed of Gear A.
2. Question: In a pulley system, if a fixed pulley is used to lift a load, what is the
mechanical advantage?
ANSWER: ✓ 1 (It changes the direction of the force but does not provide a mechanical
advantage to reduce the force needed).
3. Question: Two springs are connected in series. Spring A has a stiffness of 10 N/m and
Spring B has a stiffness of 20 N/m. What is the total effective stiffness?
ANSWER: ✓ Approximately 6.67 N/m. (Formula for springs in series: 1/k_total = 1/k1 +
1/k2).
4. Question: What happens to the pressure of a fluid in a closed container if the force
applied to it is doubled while the area remains the same?
ANSWER: ✓ The pressure will double. (Pressure = Force / Area).
5. Question: A lever is used to lift a 100 lb rock. The fulcrum is placed 1 foot from the
rock and 3 feet from the applied force. How much force is needed to lift the rock?
ANSWER: ✓ 33.3 lbs. (Mechanical Advantage = Effort Arm / Load Arm = 3ft / 1ft = 3.
So, Force needed = Load / MA = 100 lbs / 3).
6. Question: In a hydraulic system, a force of 50 N is applied to a piston with an area of
0.1 m². The second piston has an area of 0.5 m². What force can the second piston
exert?
, ANSWER: ✓ 250 N. (Pressure is equal: F1/A1 = F2/A2. So, 50/0.1 = F2/0.5 -> F2 = 500 *
0.5).
7. Question: If a weight is suspended by two ropes at 45-degree angles from the
ceiling, how does the tension in each rope compare to the weight itself?
ANSWER: ✓ The tension in each rope is greater than half the weight. (T = W / (2 *
cos(θ)). Since cos(45°) is less than 1, T > W/2).
8. Question: A ball is rolling down an inclined plane. What happens to its speed and
acceleration (ignoring friction)?
ANSWER: ✓ Its speed increases and its acceleration remains constant.
9. Question: What type of simple machine is a screw?
ANSWER: ✓ An inclined plane wrapped around a cylinder.
10. Question: If a seesaw is perfectly balanced, what does this imply about the
moments (torques) on each side?
ANSWER: ✓ The clockwise moment is equal to the counter-clockwise moment.
Section 2: Electrical Concepts
11. Question: In a simple DC series circuit with a 12V battery and two resistors (4Ω and
2Ω), what is the total current flowing in the circuit?
ANSWER: ✓ 2 Amps. (R_total = 4Ω + 2Ω = 6Ω. I = V/R = 12V / 6Ω = 2A).
12. Question: What will a voltmeter measure when connected across a single resistor in
a circuit?
ANSWER: ✓ The voltage drop across that specific resistor.
13. Question: If three identical resistors are connected in parallel, what is the total
resistance compared to a single resistor's value (R)?
ANSWER: ✓ R_total = R / 3.
14. Question: What is the unit of electrical power?
ANSWER: ✓ The Watt (W).
Disclaimer: This guide is based on public domain knowledge of the ATT Test's common
subject areas. AT&T does not publish an official public study guide. The exact questions
on the actual test will vary. This guide is designed to reinforce the core concepts and
problem-solving skills required to succeed.
Section 1: Mechanical Concepts
1. Question: If Gear A has 20 teeth and rotates clockwise, and it is meshed with Gear B
which has 40 teeth, which direction will Gear B rotate and how will its speed compare?
ANSWER: ✓ Gear B will rotate counter-clockwise and at half the speed of Gear A.
2. Question: In a pulley system, if a fixed pulley is used to lift a load, what is the
mechanical advantage?
ANSWER: ✓ 1 (It changes the direction of the force but does not provide a mechanical
advantage to reduce the force needed).
3. Question: Two springs are connected in series. Spring A has a stiffness of 10 N/m and
Spring B has a stiffness of 20 N/m. What is the total effective stiffness?
ANSWER: ✓ Approximately 6.67 N/m. (Formula for springs in series: 1/k_total = 1/k1 +
1/k2).
4. Question: What happens to the pressure of a fluid in a closed container if the force
applied to it is doubled while the area remains the same?
ANSWER: ✓ The pressure will double. (Pressure = Force / Area).
5. Question: A lever is used to lift a 100 lb rock. The fulcrum is placed 1 foot from the
rock and 3 feet from the applied force. How much force is needed to lift the rock?
ANSWER: ✓ 33.3 lbs. (Mechanical Advantage = Effort Arm / Load Arm = 3ft / 1ft = 3.
So, Force needed = Load / MA = 100 lbs / 3).
6. Question: In a hydraulic system, a force of 50 N is applied to a piston with an area of
0.1 m². The second piston has an area of 0.5 m². What force can the second piston
exert?
, ANSWER: ✓ 250 N. (Pressure is equal: F1/A1 = F2/A2. So, 50/0.1 = F2/0.5 -> F2 = 500 *
0.5).
7. Question: If a weight is suspended by two ropes at 45-degree angles from the
ceiling, how does the tension in each rope compare to the weight itself?
ANSWER: ✓ The tension in each rope is greater than half the weight. (T = W / (2 *
cos(θ)). Since cos(45°) is less than 1, T > W/2).
8. Question: A ball is rolling down an inclined plane. What happens to its speed and
acceleration (ignoring friction)?
ANSWER: ✓ Its speed increases and its acceleration remains constant.
9. Question: What type of simple machine is a screw?
ANSWER: ✓ An inclined plane wrapped around a cylinder.
10. Question: If a seesaw is perfectly balanced, what does this imply about the
moments (torques) on each side?
ANSWER: ✓ The clockwise moment is equal to the counter-clockwise moment.
Section 2: Electrical Concepts
11. Question: In a simple DC series circuit with a 12V battery and two resistors (4Ω and
2Ω), what is the total current flowing in the circuit?
ANSWER: ✓ 2 Amps. (R_total = 4Ω + 2Ω = 6Ω. I = V/R = 12V / 6Ω = 2A).
12. Question: What will a voltmeter measure when connected across a single resistor in
a circuit?
ANSWER: ✓ The voltage drop across that specific resistor.
13. Question: If three identical resistors are connected in parallel, what is the total
resistance compared to a single resistor's value (R)?
ANSWER: ✓ R_total = R / 3.
14. Question: What is the unit of electrical power?
ANSWER: ✓ The Watt (W).
