190303I

Question 1

True or false: Final drives provide a final overdrive?

Answer 1

False, the provide a final reduction

Question 2

What are the three gearing configurations a final drive can have?

Answer 2

Pinion & Bull gear set
Planetary gear sets
Chain drives
**Can be a combination of all three

Question 3

What is the number one advantage of a chain final drive?

Answer 3

Inexpensive to make compared to the other options

Question 4

Is ground clearance able to be increase or is it decreased with a chain drive?

Answer 4

Ground clearance is increase

Question 5

Can planetary final drives be mounted on a steering axle?

Answer 5

Yes

Question 6

What are the advantages of electric drive?

Answer 6

Direct drive can be achieved
There is no wait for power
Fewer mechanical components
Can retard equipment well
Consume less oil

Question 7

What are some major disadvantages of electric drive?

Answer 7

Cost
Heavier than mechanical
Control of torque

Question 8

Is electric drive AC or DC?

Answer 8

AC, DC gets converted to AC

Question 9

The main control group can also be called?

Answer 9

Brain and Nerve center

Question 10

How many phases does the AC drive generator typically have?

Answer 10

3 Phase

Question 11

Why can a electric drive system be considered dangerous even after shut down?

Answer 11

DC bus voltage can reach over 2000 V DC

Question 12

What is a VFD?

Answer 12

Variable Frequency Drives

Question 13

What does PWM stand for?

Answer 13

Pulse Width Modulation

Question 14

Why do we need to use air to cool off electric drive components?

Answer 14

With that much electricity being produced it will create a lot of heat

Question 15

Can electric dynamic brake systems be the only brake system on a piece of equipment?

Answer 15

No, there must be service brakes

Question 16

What is the purpose of a capacitors in relation to an electric drive?

Answer 16

Capacitors filter and store DC bus voltage as well as absorb transient DC voltage spikes

Question 17

What types of gloves need to be worn when removing compartment covers for high-voltage sections of the power inverter cabinets?

Answer 17

Rubber gloves (that meet rating) and a leather glove over top to protect rubber gloves

Question 18

What drives the main blower fan?

Answer 18

Driven by the 3 phase AC motor

Question 19

If wearing PPE how far away must you be from a conductive component until voltage is confirmed to be at a safe level?

Answer 19

30.2 cm or 12 inches

Question 20

If you are not wearing any PPE how far away do you need to be from conductive components?

Answer 20

0.8 m or 2.5 ft

Question 21

Describe Bull gear

Answer 21

Bull gear is the largest output gear

Question 22

How many types of reduction are available in the final drive?

Answer 22

single, double, triple reduction

Question 23

Final drive brakes are usual what style?

Answer 23

Wet, multi disc styled brakes