Block 8 Phase III - Electrical

Question 1

What effects can electrical shock have on the human body?

Answer 1

Disrupt bodies electrical function
stop heart
stop lungs
death

Question 2

State the types of voltages

Answer 2

A/C
D/C

Question 3

Name the sources of AC power for the aircraft

Answer 3

IDG’s
APU Generator
External Power
Static Inverter

Question 4

Name the sources of D/C power for the aircraft

Answer 4

Batteries
Transformer Rectifier Units

Question 5

What is the unit of measurement for the electrical current?

Answer 5

Amperes (Amps)

Question 6

Resistance

Answer 6

Causes opposition to flow of electricity

Question 7

Ohm’s Law

Answer 7

Current through conductor is directly proportional to voltage across 2 points.

Question 8

Frequency

Answer 8

Number of complete alternations per second of an a/c circuit

Question 9

Electrical Bus

Answer 9

Central point of distribution (A/C or D/C) for multiple systems.

Question 10

Circuit Breakers

Answer 10

Overcurrent protection, push/pull type. RESETABLE

Question 11

Fuse

Answer 11

Overcurrent protection device, single use only**

Question 12

Relay

Answer 12

Electrically activated switch used to control distribution of electricity in a circuit

Question 13

State the output of the Integrated Drive Generator (IDG)

Answer 13

115 VAC, 400Hz rated up to 180kva or 522 amps

Question 14

State the two batteries used on the aircraft

Answer 14

Main
Aux

Question 15

State the purpose of the Transformer Rectifier Units (TRU’s)

Answer 15

Convert electrical power and provide a nominal 28vdc to plane systems that require power

Question 16

How long will the main and aux batteries provide power after a loss of all A/C power?

Answer 16

30 minutes minimum