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Apperatus Tech Test > VDOT > Flashcards

VDOT Flashcards

1
Q

How much play in a steering wheel is allowed

A

No more than 10° approximately 2 inches in a 20 inch steering wheel

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2
Q

For airbrakes air pressure should build from 50 psi to 90 psi how fast

A

3 minutes

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3
Q

Oil pressure at idle should read what

A

5-20 psi

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4
Q

Oil pressure while operating should read what

A

35-75 psi

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5
Q

drivers should look at least how many seconds ahead

A

12-15 seconds

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6
Q

If stopped on or near one way or divided highways you should place 2 warning devices how far from the vehicle

A

10’
100’

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7
Q

If you stop on a two-lane Road caring traffic in both directions or Undivided-highways You should place warning devices where

A

Within 10 feet of the front or rear corners of the vehicle and 100 feet behind in ahead of the vehicle

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8
Q

total Stopping distance is the sum of what?

A

perception distance
reaction distance
braking distance

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9
Q

Define perception distance

A

Distance vehicle travels under ideal conditions from Time eyes see a hazard until brain recognizes it

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10
Q

Define reaction distance

A

Distance travel under ideal conditions before physically touching breaks in response to hazard seen

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11
Q

Define braking distance

A

Distance vehicle travels and ideal conditions while breaking

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12
Q

If you double your speed from 20 to 40 miles per an hour the impact power increases how many times greater

A

4x

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13
Q

True or false empty trucks require greater stopping distances

A

True
less weight means less traction for the tires and brakes

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14
Q

When driving on a slippery surfaces reduce speed by how much of a fraction

A

1/3

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15
Q

When driving on icy surfaces produce speeds by how much of a fraction

A

1/2

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16
Q

In regards to managing space, you need at least one second for each how many feet at speeds below 40 miles an hour

A

10’

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17
Q

When using low beams, you can see ahead about how many feet

A

250

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18
Q

When using high beams you can see ahead about how many feet

A

350-500’

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19
Q

True or false air pressure increases when temperature increases

A

true

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20
Q

At train crossings vehicles must stop no closer than how many feet

A

15’

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21
Q

what are four Causes for Skidding

A

Over breaking
over steering
over acceleration
driving too fast

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22
Q

When does the low air pressure warning signal come on

A

when air pressure in tank falls below 60 PSI

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23
Q

When do emergency breaks come fully on

A

When air pressure drops to arrange of 20 to 40 psi

24
Q

Before driving a vehicle with dual air systems front and rear allow time for air compressor to build up a minimum of how much psi

A

100

25
Q

At what psi should air compressor kick on

A

100 psi

26
Q

At what psi should air compressor kick off

A

125 psi

27
Q

To test for air leakage while the engine is off an air system charged release the parking brake a loss rate how many psi in one minute should occur

A

Less than 3 psi per minute for single vehicles

less than 4 psi per minute for combination vehicles

28
Q

When the engine is operating at RPM the pressure should bill from 85 to 100 PSI within how many seconds

A

45

29
Q

what factors contribute to total stopping distance for airbrake vehicles

A

Perception distance
reaction distance
brake lag distance
braking distance

30
Q

While inspecting engine compartment belts how much play should be at the center of the belt

A

1/2” to 3/4”

31
Q

what are 3 types of vehicle inspections

A

vehicle inspection
during trip
after trip

32
Q

when do you do a after trip inspection

A

At the end of the trip day or tour of duty

33
Q

How much of a leaf spring must be missing before vehicle will be placed out of service

A

1/4

34
Q

Air pressure governor should cut out around what range

A

120-140 psi

35
Q

Oil pressure at idle should read what range

A

5-20 psi

36
Q

Oil pressure while operating should read between what ranges

A

35-75

37
Q

How to test parking brakes

A

Set parking brake
place vehicle in low gear
gently pull forward against brake

38
Q

How to test service brakes

A

Accelerate to 5 miles an hour
press break
notice pulling or unusual feel

39
Q

Safe operation of a vehicle requires skills and what four categories

A

Accelerating
steering
stopping
packing

40
Q

When driving an automatic transmission downhill is important to use which range of gear to prevent the transmission from shifting up

A

low range

41
Q

define a hazard

A

any road conditions or users that is a possible danger

42
Q

with only —- hours of sleep, triples risk of an accident

A

6 hours

43
Q

Working more than 60 hours a week increases your risk of an accident by how much of a percent

A

40%

44
Q

What is an indication that you have lost your anti-lock braking system

A

Lamp light stays on dashboard after the bulb check

45
Q

Define over breaking

A

Breaking too hard and locking up the wheels causing a skid

46
Q

Define oversteering

A

Turning the wheels more sharply in the vehicle concern resulting in a skid

47
Q

Define over acceleration

A

Supplying too much power to the drive wheels causing them to spend

48
Q

What is the most common type of skid

A

Driving too fast rear wheels lose traction

49
Q

What are the steps and correcting a drive wheel braking skid

A

Stop breaking countersteer by turning the vehicle back on course

50
Q

What are the steps when in a front wheel skid

A

Let the vehicle slow down

51
Q

What is the purpose of the alcohol evaporator in the air brake system

A

alcohol may be added to the air system to reduce risk of ice buildup in the valves

52
Q

Define dual air brake system

A

Two separate air brake systems using a single set of brake controls each system has its own air tank hoses and lines one system typically operates rear axle the other the front

53
Q

Do you still have to check automatic slack adjusters for movement of more than 1 inch from where the pushrod attaches

A

Yes if there is more they need to be adjusted by certified mechanic

54
Q

Brake drums must not have a crack longer than ??? of the width of the friction area

A

1/2

55
Q

When testing air leak first turn off engine release the brake in time pressure drop for one minute how much 2 psi is permitted for single vehicles and 3 for a combination vehicles

then apply foot to break and hold for one minute see if air pressure drops more than three psi for single and four psi for combination

then continuously pump service brake until low pressure warning signal turns on around 60 psi

continue fanning off the air pressure by stepping on an offbreak pedal to reduce tank pressure parking brake valve should pop out at 20 to 45 psi

start engine pressure should build from 85 to 100 psi within 45 seconds on dual air systems

to test parking break stop the vehicle put the break on and gently pull against it and a low gear to see if parking break holds

To test service brakes wait for the normal air pressure release the parking brake and I move the vehicle forward slowly at 5 miles/ an hour apply service brakes and know any pulling or unusual feel delayed stopping action

A

Apperatus Tech Test (44 decks)

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