Key Topic 89: NMEA Data

Question 1

3-89N1: What data language is bi-directional, multi-transmitter, multi-receiver network?

A. NMEA 2000.
B. NMEA 0181.
C. NMEA 0182
D. NMEA 0183.

Answer 1

A. NMEA 2000.

Question 2

3-89N2: How should shielding be grounded on an NMEA data line?

A. Unterminated at both ends.
B. Terminated to ground at the talker and unterminated at the listener.
C. Unterminated at the talker and terminated at the listener.
D. Terminated at both the talker and listener.

Answer 2

B. Terminated to ground at the talker and unterminated at the listener.

Question 3

3-89N3: What might occur in NMEA 2000 network topology if one device in line should fail?

A. The system shuts down until the device is removed.
B. Other electronics after the failed device will be inoperable.
C. The main fuse on the backbone may open.
D. There will be no interruption to all other devices.

Answer 3

D. There will be no interruption to all other devices.

Question 4

3-89N4: In an NMEA 2000 device, a load equivalence number (LEN) of 1 is equivalent to how much current consumption?

A. 50 mA.
B. 10 mA.
C. 25 mA.
D. 5 mA.

Answer 4

A. 50 mA.

Question 5

3-89N5: An NMEA 2000 system with devices in a single location may be powered using this method:

A. Dual mid-powered network.
B. End-powered network.
C. Individual devices individually powered.
D. No 12 volts needed for NMEA 2000 devices.

Answer 5

B. End-powered network.

Question 6

3-89N6: What voltage drop at the end of the last segment will satisfy NMEA 2000 network cabling plans?

A. 0.5 volts.
B. 2.0 volts.
C. 1.5 volts.
D. 3.0 volts.

Answer 6

C. 1.5 volts.