【Daily Question 20090228】Provide several questions related to cascade proportional control
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1. In a cascade control system, the primary variable is ( ). (A) Process control parameters (B) Process follow-up parameters (C) Primary disturbance sources (D) Secondary disturbance sources 2. A ratio control system is generally a ratio control of (). (A) Temperature (B) Pressure (C) Liquid level (D) Flow rate. 3. Split-range control belongs to ( ) control systems. (A) Single-loop setpoint (B) Dual-loop setpoint (C) Follow-up (D) Output selectivity 4. Pure feedforward control is a control system that can compensate for ( ). (A) Deviation (B) Change in the parameter being regulated (C) Change in the disturbance amount (D) Change in the set value. 5. The essence of three-element control for boiler drum level, steam flow (or pressure), and feedwater flow is ( ). (A) Cascade control (B) Selective control (C) Feedforward control (D) Feedforward-cascade control Answer key: A D A C D
1A\2D\3D\4C\5D
1. In a cascade control system, the primary variable is (A). (A) Process control parameters (B) Process follow-up parameters (C) Primary disturbance sources (D) Secondary disturbance sources. 2. A ratio control system is generally a ratio control of (D). (A) Temperature (B) Pressure (C) Liquid level (D) Flow rate. 3. Split-range control belongs to (C) control system. (A) Single-loop setpoint (B) Dual-loop setpoint (C) Follow-up (D) Output selectivity 4. Simple feedforward control is a control system that can compensate for (B). (A) Deviation (B) Change in the parameter being regulated (C) Change in the disturbance amount (D) Change in the set value. 5. The essence of three-element control for boiler drum level, steam flow (or pressure), and feedwater flow is (C). (A) Cascade control (B) Selective control (C) Feedforward control (D) Feedforward-cascade control
Answer: 1, A； 2，D ； 3，D ； 4，B ； 5，D
1. In a cascade control system, the primary variable is (A). (A) Process control parameters (B) Process follow-up parameters (C) Primary disturbance sources (D) Secondary disturbance sources. 2. A ratio control system is generally a ratio control of (D). (A) Temperature (B) Pressure (C) Liquid level (D) Flow rate. 3. Split-range control belongs to (D) control system. (A) Single-loop setpoint (B) Dual-loop setpoint (C) Follow-up (D) Output selectivity 4. Simple feedforward control is a control system that can compensate for (B). (A) Deviation (B) Change in the parameter being regulated (C) Change in the disturbance amount (D) Change in the set value. 5. The essence of three-element control for boiler drum level, steam flow (or pressure), and feedwater flow is (C). (A) Cascade control (B) Selective control (C) Feedforward control (D) Feedforward-cascade control
1. In a cascade control system, the primary variable is (A). (A) Process control parameters (B) Process follow-up parameters (C) Primary disturbance sources (D) Secondary disturbance sources. 2. A ratio control system is generally a ratio control of (D). (A) Temperature (B) Pressure (C) Liquid level (D) Flow rate. 3. Split-range control belongs to (D) control system. (A) Single-loop setpoint (B) Dual-loop setpoint (C) Follow-up (D) Output selectivity 4. Simple feedforward control is a control system that can compensate for (B). (A) Deviation (B) Change in the parameter being regulated (C) Change in the disturbance amount (D) Change in the set value. 5. The essence of three-element control for boiler drum level, steam flow (or pressure), and feedwater flow is (C). (A) Cascade control (B) Selective control (C) Feedforward control (D) Feedforward-cascade control
(A) (D) (D) (C) (D)
1. In a cascade control system, the primary variable is (A). (A) Process control parameters (B) Process follow-up parameters (C) Primary disturbance sources (D) Secondary disturbance sources. 2. A ratio control system is generally a ratio control of (D). (A) Temperature (B) Pressure (C) Liquid level (D) Flow rate. 3. Split-range control belongs to (D) control system. (A) Single-loop setpoint (B) Dual-loop setpoint (C) Follow-up (D) Output selectivity 4. Pure feedforward control is a control system that can compensate for (C). (A) Deviation (B) Change in the parameter being regulated (C) Change in disturbance signals (D) Change in the set value. 5. The essence of three-element control for boiler drum level, steam flow (or pressure), and feedwater flow is (D). (A) Cascade control (B) Selective control (C) Feedforward control (D) Feedforward-cascade control
1，A； 2，D ； 3，D ； 4，B ； 5，D
1.A 2.D 3.D 4.C 5.D
1、A； 2、D ； 3、D ； 4、C ； 5、D
1、A 2、D 3、D 4、C 5、D
I think the answers are A, D, D, C, D. A simple feedforward control system is one that can compensate for disturbances.
Answer: 1, A2, B.D； 3，D ； 4，C ； 5，D
1. In a cascade control system, the primary variable is (A). (A) Process control parameters (B) Process follow-up parameters (C) Primary disturbance sources (D) Secondary disturbance sources. 2. A ratio control system is generally a ratio control of (D). (A) Temperature (B) Pressure (C) Liquid level (D) Flow rate. 3. Split-range control belongs to (D) control system. (A) Single-loop setpoint (B) Dual-loop setpoint (C) Follow-up (D) Output selectivity 4. Pure feedforward control is a control system that can compensate for (C). (A) Deviation (B) Change in the parameter being regulated (C) Change in disturbance signals (D) Change in the set value. 5. The essence of three-element control for boiler drum level, steam flow (or pressure), and feedwater flow is (D). (A) Cascade control (B) Selective control (C) Feedforward control (D) Feedforward-cascade control
1、A； 2、D ； 3、D ； 4、B ； 5、D
1、A； 2、D ； 3、D ； 4、B ； 5、D
1，A； 2，D ； 3，D ； 4，B ； 5，D
1, A, 2, D, 3, D, 4, B, 5, D
1、A； 2、D ； 3、D ； 4、C ； 5、D