While troubleshooting a circuit the voltage seems to be zero; ...

[Hungry!]

While troubleshooting a circuit the voltage seems to be zero; what if any adjustment should be checked on the oscilloscope?
 
  A) focus setting B) AC/GND/DC switch
  C) time division setting D) trigger level

Question 2

Superimposing an AC voltage of 3.54 Vrms with a DC source of 10 V results in a waveform that:
 
  A) peaks at 20 V. B) peaks at 13.54 V. C) peaks at 15 V. D) both B and C

[brittiany.barnes]

Answer to Question 1

B

Answer to Question 2

C