Airframe Electrical Power Unit #2 (Kahoot)

1. Electrical relays have coil voltage and coil duty cycle specifications.

• True

• False

True

2. Zero center ammeters are connected between the aircraft primary DC busbar and the

• Battery

• Starter Relay

• Alternator/ Generator

Battery

3. Aircraft fuse and circuit breaker capacity is rated in

• Volts

• Amperes

• Ohms

Amperes

4. A fuse is installed in an aircraft electrical system primarily to protect the

• wire and should be located as close to the source as possible.

• wire and should be located as close to the unit as possible.

• electrical load and should be as close to the source as possible.

wire and should be located as close to the source as possible.

5. Which switch can control two circuits at the same time and does not need to be held on

• SPDT (on-off-on)

• SPST (momentary)

• DPST (off-on)

DPST (off-on)

6. What is the advantage of a circuit breaker when compared to a fuse?

• Resettable and reusable.

• Always eliminates the need of a switch.

• Never needs replacing.

Resettable and reusable.

7. When a relay coil has enough current flow through it the relay contacts will change electrical condition

• True

• False

True

8. A relay is used to

• Control high current with low current

• Convert kinetic to electric energy

• Receives electrical energy and passes it on with low resistance

Control high current with low current

9. A DPST switch will have ____________ electrical terminals on the switch housing

• Two

• Three

• Four

Four

10. The voltage rating of a diode is based upon a Forward biased condition.

• True

• False

False

11. A 12vdc lead-acid battery will have

• 6 cells

• 12 cells

• 3 cells

6 cells

12. A 24vdc lead-acid battery will have

• 6 Cells

• 12 Cells

• 3 Cells

12 Cells

13. A 24vdc Ni-Cad battery will have

• 10 Cells

• 12 Cells

• 20 Cells

20 Cells

14. Larger aircraft will typically use __________ batteries

• Lead-Acid

• Ni-Cad

• Lithium Ion

Ni-Cad

15. The C1 rate is a _____ discharge rate that a tests a battery's capability to deliver current, while maintaining voltage

• 2 Hour

• 1/2 Hour

• 1 Hour

1 Hour

16. End Point Voltage (EPV) of lead-acid battery cell is 1.67 during a measured discharge of a capacity check.

• True

• False

True

17. The electric current in a circuit will decrease as circuit resistance increases, with the same applied voltage.

• True

• False

True

18. Lead Acid batteries are more likely to freeze when in a low charge state

• True

• False

True

19. When removing a battery, disconnect the _____ cable first.

• Positive

• Negative

• Either

Negative

20. A diode that measures OL across it when tested with DMM is

• electrically open when forward biased.

• electrically shorted when reverse biased.

• operating normally when forward biased

electrically open when forward biased.

21. Continuous duty cycle relays require less current across the coil than intermittent duty cycle relays to be operated.

• True

• False

True

22. A diode in parallel to a batter relay is used for

• Arc suppression

• Polarity protection

• Control the relay

Arc suppression

23. A diode in series to a battery relay is used for

• Arc suppression

• Polarity protection

• Control the relay

Polarity protection

24. What switch should you install in a single wire circuit that required the switch to be manually held in the ON position?

• (SPST), two-position normally open

• (SPST), single-position

• (SPDT), single-position normally open (NO).

(SPST), two-position normally open

25. An electrical switch must be derated based upon the type of load current it controls.

• True

• False

True

26. Alternator/Generator output is controlled by adjusting the input/field voltage

• True

• False

True