Practice Test Geeks(CCT) Certified Casper Technician Practice Test
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System Operation & Monitoring Flashcards

7 cards from real CCT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 System Operation & Monitoring flashcards as text

  1. During a Casper preventive maintenance cycle, a technician notices that the dry pump exhaust pressure is 15% higher than the baseline recorded three months ago. This MOST likely indicates:

    Answer: Partial blockage in the exhaust line or scrubber

    Rising exhaust backpressure is a common sign of particulate buildup or condensate accumulation in the exhaust line or abatement system.

  2. When performing a Casper system leak check using a helium mass spectrometer, which method provides the most reliable results?

    Answer: Spray helium on external joints while monitoring the leak rate

    Spraying helium externally on joints while monitoring the spectrometer response allows precise localization of leak points.

  3. A Casper system's chiller setpoint is 20°C but the chiller outlet temperature reads 23°C during process. What is the MOST likely cause?

    Answer: Insufficient coolant flow or chiller heat load exceeded

    When the outlet temperature exceeds setpoint, the chiller is typically unable to reject enough heat, often due to low flow or an excessive thermal load.

  4. In a Casper system, the electrostatic chuck (ESC) clamp voltage is applied but wafer lift-off after process shows the wafer is 'stuck.' What parameter should the technician check in the process log?

    Answer: ESC de-chuck voltage ramp and dwell time

    Insufficient de-chuck voltage duration or ramp profile is a common reason wafers remain adhered to the ESC after process completion.

  5. A Casper technician reviews the SPC (Statistical Process Control) chart for etch rate and finds the last 8 consecutive points are all below the center line. This pattern indicates:

    Answer: A systematic process shift requiring investigation

    Eight consecutive points on one side of the center line is a classic SPC run rule indicating a non-random systematic shift in the process.

  6. Which Casper system sensor would be MOST useful for detecting a plasma strike failure during process initiation?

    Answer: RF delivered power and reflected power monitor

    A sudden spike in reflected power without a corresponding drop during ignition phase indicates the plasma failed to strike and ignite.

  7. A Casper system alarm log shows 'interlock violated: door open during pump sequence.' The SAFEST immediate response is:

    Answer: Stop the pump sequence and verify the door is fully secured before resuming

    Interlocks protect both equipment and personnel; the correct response is always to clear the unsafe condition before resuming any automated sequence.