(c) Low temperature applications High temperatures, with evaporators from about 30°F to 60°F. The Cascade Control Block Diagram shows a generic cascade control system with two controllers, two sensors, and one actuator acting on two processes in series. 4. (b) Three stage From my understanding, for cascade control system, the setpoint for level is fixed while the setpoint for flow is floating to ensure level meets the setpoint. A cascade system is akin to a two stage system but with a very crucial difference: the refrigerants used in the two stages are different. A condensing temperature of 35°C is assumed, with the intermediate pressure being the geomet-ric mean of the condensing and evaporating pressures. (Ans: c), In cascade refrigeration, condenser of low temperature refrigeration is coupled with Jacques: November 16, 2016 at 2:17 pm. 7. Always check for measurement and valve-related issues. Second-stage voltage gain in db = 20 log 10 200 = 20 × 2.3 = 46. You should first, a. B) Remote/ Auto Control C) Master/Slave D) Serial Comm. The utility model provides a single-compressor two-stage auto-cascade refrigeration system. What is the refrigerator? c. Pressure ØBy letting-down the pressure of chilled and highly compressed refrigerant, we can obtain a cold temperature of refrigerant. The duplex controller provides the following number of control valve signals: Save my name, email, and website in this browser for the next time I comment. High Pressure . View Answer: Answer: Option A. d. Two or more measured variables must be isolated. c. Not affect them Split-Range, Auto-Selector, Ratio & Cascade Systems X MCQ on Flow Measurement Multiple Choice Questions MCQ ON Flow Measurement 1.A differential pressure transmitter is calibrated 0 to 80 inches of water and transmits a 4 to 20 mA dc signal. (Ans:a), The COP of a single stage vapor compression refrigeration working between the same temperature limits is (a) Cold storage One (Ans: b), Cascading refrigeration is applicable for Vapor Compression refrigeration -2. (Ans: a), For achieving -800C temperature, cascade refrigeration used is c. Isolated from one another Database Management Systems are featured with: a. 3) The system described by y [n] = nx [n] is a) Linear, time varying and stable b) Non-linear, time invariant and unstable. If the time constant of the secondary loop is greater than the time constant of the primary loop, cascade control will: a. (d) None The circuit gives the typical biasing arrangement and use of coupling capacitors C b1 and C b2. https://www.mesubjects.net/wp-admin/post.php?post=4188&action=edit         MCQ Vapor Absorption refrigeration-1, https://www.mesubjects.net/wp-admin/post.php?post=4105&action=edit       Q.A. (c) Condenser of high temperature TWO- AND THREE-STAGE CASCADE REFRIGERATION SYSTEM By: Paul B. Reed INTRODUCTION Mechanical refrigerating systems in most common use fall into three classes as far as the temperatures of the evaporators are concerned: 1. B. frequency response of the first amplifier. R-13, R-503, R-170, and R-1150 in a cylinder at room temperature will have a pressure of 500 to 700 psig and R-14 will be higher still. (b) Three stage Simplified Drawing Showing Piping Arrangement of a Two-Stage Cascade System . (Bottom on mobile) The cascade cycle is often employed for devices such as ULT freezers.. Third-stage voltage gain in db = 20 log 10 400 = 20 × 2.6 = 52 ∴ Total voltage gain = 40 + 46 + 52 = 138 db. Increase them (d) None The auto-selector controller will function only when the measurement inputs are: a. Interdependent Two (c) Mix when in the vapor state (d) None The process has more controlled variables than manipulated variables b. Flow We'll assume you're ok with this, but you can opt-out if you wish. Primary controllers output is fed to secondary controller as a Set point. Where, r = u1, u2, u3 ……….. ur. Huge collection of MCQ questions c. Online MCQ quiz d. Subjective questions and answers 90. Now we are taking n state variables to describe the given system hence n = x1, x2, ……….. xn. Used as if a 1 percent error can be tolerated In a cascade control system, two or more controllers are cascaded to control one or more process variable. Outer Loop Tuning - put slave into Cascade and tune master controller as a normal PID loop. The process has more manipulated variables than controlled variables A. frequency response of each stage depending on the relationships of the critical frequencies. 10. (Ans: b), In Cascade refrigeration, cooling effect is produced by Gas is separated from liquid refrigerant in an intermediate receiver between the pressure limits of 0.8 and 0.14.... 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