Key Topic 37: Display System Power Supplies

Question 1

8-37D1: The display power supply provides the following:

A. +18 volts DC for the pulse forming network.
B. 5 volts DC for logic circuits and ±12 volts DC for analog and sweep circuits.
C. 80 volts AC for the antenna resolver circuits.
D. All of the above.

Answer 1

B. 5 volts DC for logic circuits and ±12 volts DC for analog and sweep circuits.

Question 2

8-37D2: The display power supply provides the following:

A. 5 volts DC for logic circuits.
B. ±12 volts DC for analog and sweep circuits.
C. 17kV DC for the CRT HV anode.
D. All of the above.

Answer 2

D. All of the above.

Question 3

8-37D3: In a display system power supply what is the purpose of the chopper?

A. It acts as an electronic switch between the raw DC output and the inverter.
B. It interrupts the AC supply line at a varying rate depending on the load demands.
C. It regulates the 5 volt DC output.
D. It pre-regulates the AC input.

Answer 3

A. It acts as an electronic switch between the raw DC output and the inverter.

Question 4

8-37D4: In a display system power supply, what is the purpose of the inverter?

A. Inverts the polarity of the DC voltage applied to the voltage regulators.
B. Provides the dual polarity 12 volt DC supply.
C. Acts as the voltage regulator for the 5 volt DC supply.
D. Produces the pulsed DC input voltage to the power transformer.

Answer 4

D. Produces the pulsed DC input voltage to the power transformer.

Question 5

8-37D5: What would be a common switching frequency for a display system power supply?

A. 18 kHz
B. 120 Hz
C. 60 kHz
D. 120 kHz

Answer 5

A. 18 kHz

Question 6

8-37D6: What display system power supply output would use a tripler circuit?

A. The logic circuit supply.
B. The sweep circuit supply.
C. The HV supply for the CRT anode.
D. The resolver drive.

Answer 6

C. The HV supply for the CRT anode.