A - Air Brake System Fundamentals Flashcards

1
Q

Friction:

A

Refers to the resistance between two moving bodies.

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2
Q

In order to stop a moving vehicle, the braking system must convert moving vehicle energy into:

A

Heat energy.

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3
Q

A vehicle requires 200 hp (149 kW) to accelerate from 0 to 100 km/h in 60 seconds, the braking system must develop:

A

2000 hp (1.49 MW).

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4
Q

If the weight of a vehicle is doubled, the power required to stop the vehicle will:

A

Be doubled.

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5
Q

If the speed of a moving vehicle is doubled, the power required to stop the vehicle will:

A

Be increased four times.

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6
Q

If both speed and weight of a moving vehicle are doubled, the power required to stop the vehicle will:

A

Be increased eight times.

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7
Q

One advantage that air brake systems have is that:

A

The system does not have to be bled when connecting or disconnecting trailers like hydraulic braking systems do.

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8
Q

One disadvantage air brake systems have is that:

A

There is always some brake lag.

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9
Q

When a given volume of air is compressed to 1/2 its original volume, its pressure will:

A

Double.

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10
Q

When a given volume of air is compressed to 1/2 its original volume, theoretically its temperature will:

A

Double

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11
Q

A driver makes a 40 psi (275.88 kPa) air brake application. If the vehicle is equipped with brake chambers that are 30 in squared (0.019 m squared) in area, each brake chamber will generate:

A

1200 lb (5.34 kN) of force.

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12
Q

If the brake chamber in question #11 was acting on a 6 in (0.152 m) slack adjuster, the brake shaft would feel:

A

7200 in-lb (813.60 N . m) of torque.

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13
Q

The term Lag Time refers to the time required:

A

For the air system to apply the brakes.

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14
Q

The component of the basic air brake system that connects the air system to the foundation brakes is the:

A

Brake chamber.

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15
Q

The component of the basic air brake system that allows the operator to regulate brake application pressure is the:

A

Brake valve.

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16
Q

The function of the governor is to:

A

Limit maximum air system pressure.

17
Q

The slack adjusters:

A

Convert linear motion to rotary motion, multiply the braking force from the brake chamber, and provide a place for brake adjustment.

18
Q

Connecting lines and fittings are important to air brake system operation because they affect:

A

The speed of air flow through the system.