A propulsion engine, using the speed control...

Question 1 / 2066636eef28f7522a1c520156

Question 1 of 2066636eef28f7522a1c520156

A propulsion engine, using the speed control circuit shown in the illustration, fails to function at speeds lower than the low end of the critical speed range. Which of the following statements describes what should be done to correct this malfunction? Illustration MO-0114

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🔍 Key Concepts

• Understand how the critical speed jump control valve (22A) bypasses the speed range between the setpoints of 17A and 17B • Role of the low‑end speed set point regulator (17A) versus the high‑end speed set point regulator (17B) in defining the limits of the critical speed range • What happens to engine operation if the low‑end setpoint is misadjusted or the device fails

💭 Think About

• Look at the illustration and trace the speed control signal path when the engine is commanded to run below the low end of the critical speed range. Which component first responds? • If the engine cannot operate at speeds lower than the low end of the critical range, does this indicate a problem with the low‑end limit, the high‑end limit, or the circuit outside the jump range? Why? • Which of the choices actually changes the width or location of the critical speed range, and which focuses on restoring the correct low‑end limit so normal low‑speed operation is possible?

✅ Before You Answer

• Verify which device number in the diagram is labeled "Low End Speed Set Point Regulator" and match it to the answer choices • Check whether adjusting 17A and 17B both together would widen, narrow, or shift the critical speed range as shown by the control logic • Confirm that the malfunction described is loss of operation only below the low‑end critical speed, not a change in the entire critical range or its width

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Question 1 of 20

The critical speed range will be varied as the setpoints of 17A or 17B are reset, therefore, another segment of the speed control circuit must be repaired.

Device 17A needs to be replaced, repaired, or reset to the setpoint coinciding with the RPM value for the low end of the critical speed range.

To increase the critical speed range of the engine, reduce the setpoint of 17A and 17B respectively, to 0.80 bar and 1.0 bar.

Question 1 / 2066636eef28f7522a1c520156

Question 1 of 2066636eef28f7522a1c520156

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Question 1 of 20

66636eef28f7522a1c520156

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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