Place the primary controller on manual and adjust the secondary controller Flow A cascade refrigeration cycle is a multi-stage thermodynamic cycle.An example two-stage process is shown at right. Two-Stage Refrigeration of ethylene Three-Stage Refrigeration of propane Multi-Stage Cascade Refrigeration Cycle & Results 02/33. b. Transpose o… Two b. (b) Three stage 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. Solution: 4. (a) ≤ One We'll assume you're ok with this, but you can opt-out if you wish. The process has more manipulated variables than controlled variables (d) None (ANs: b), For achieving -500C temperature, cascade refrigeration used is c. Pressure 4. (c) Condenser of high temperature Where, r = u1, u2, u3 ……….. ur. 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. (a) Air refrigeration Figure 2 gives the circuit of a two stage CE audio amplifier. b. The amplifier consists of three stages, a low gain degenerated common emitter Q 1, a high gain stage, Q 2 and the push-pull output stage, Q 3 and Q 4.Q 3 and Q 4 are commonly referred to as a push pull configuration. A primary or master controller generates a control effort that serves as the setpoint for a secondary or slave controller. Refrigeration Cycle and Input Condition of Natural Gas 03/33. D. lower critical frequency of the first amplifier and the upper critical frequency of the final amplifier. Transpose of output vectors, Where, T is transpose of the matrix. (d) None A very common secondary loop that may be used with almost any process except flow is: a. Has one measurement in put and two outputs E) Multi-motor with Cascade Controller card. If I use cascade control system for level (master) and flow (slave), how can I limit the flow at certain number i.e 50 m3/hr. (b) Do not mix with each other d. Flow measurements, a. d. Two or more measured variables must be isolated. Second-stage voltage gain in db = 20 log 10 200 = 20 × 2.3 = 46. Accept Read More, Split-Range, Auto-Selector, Ratio & Cascade Systems, Feedback Control Loop Questions & Answers, Feedback Control Loop Questions & Answers 1. A. frequency response of each stage depending on the relationships of the critical frequencies. View Answer: Answer: Option A. Single frame two stage compressor inter-stage cooling systems, c. Various methods of inter-stage gas cooling, their advantages and drawbacks, and d. 1.Performance comparisons of various methods. (a) Two stage High temperatures, with evaporators from about 30°F to 60°F. Cascade refrigeration is applicable to (d) None In a cascade control system, two or more controllers are cascaded to control one or more process variable. The facility to easy editing, spelling check, auto pagination, lay out and printing reports b. Inner Loop Tuning - put slave into Local Auto or Manual and tune the slave controller as a normal PID loop. c. 1.0 to 10 Two advantages of using helical gears rather than spur gears in a transmission system are (A) Strength and cost (B) Strength and less end thrust (C) Noise level and strength (D) Noise level and economy. In this study, a novel internal auto-cascade two-stage compression system with double auto-cascade (DAC) using refrigerant mixtures is proposed, which can partially exchange the destinations of the liquid and gas fluids and drive the working fluid rich in high-pressure composition to enter the evaporator, enhancing the system performance. A schematic system layout and the corresponding process in a log P/h diagram are shown in Figure 10.16. d. Must always employ the derivative mode in the controller. (a) Latent heat (a) Greater than that for a cascade refrigeration This transmi…, Measurement and Instrumentation Objective Questions – Part 3, Linearizing Effect & Regenerative Feedback MCQ, Time Response of Second Order Systems – I, Total Reflection Spectrometer Questions & Answers, Electrical & Instrumentation QC Interview Questions. Third-stage voltage gain in db = 20 log 10 400 = 20 × 2.6 = 52 ∴ Total voltage gain = 40 + 46 + 52 = 138 db. The auto-selector controller will function only when the measurement inputs are: a. Interdependent First-stage voltage gain in db = 20 log 10 100 = 20 × 2 = 40. In a cascade control system the secondary may be regarded as: a. Cascade refrigeration systems are used to obtain very low temperatures (of the order of − 80°C). (d) None Vapor Compression refrigeration -2. 15. c. Improve the operation of the system c) Non-linear, time varying and stable. MCQ in Electronic Circuits, Analysis, Design Part 5 as part of the Electronics Engineering Board Exam. Simplified Drawing Showing Piping Arrangement of a Two-Stage Cascade System . A cascade filling system is a high pressure gas cylinder storage system which is used for the refilling of smaller compressed gas cylinders. by denizen robo January 11, 2016 February 9, 2018 0 279. d. Valve position, 9. And m = y1, y2 ……….. ym. In cascade control system two controllers are cascaded to each other as shown in the diagram below. The signals must be: a. 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. A cascade control system will increase the natural frequency of the control loop along with having the following inftuence on the magnitudes of the associated time constants, a. (d) None In order to determine the impact of R50 on the refrigeration cycle, the experiments are made by using mixed-refrigerants with R134a/R23/R14 and R134a/R23/R14/R50 containing the same quantity of R134a, R23 and R14 respectively in the same device. The corresponding values of second amplifier are : 25, 80 KΩ, 12 KΩ, 1.2 MΩ respectively. (b) Three stage (c) Zero Split-Range Control System Questions, Auto-Selector Questions, Ratio Control System Questions & Cascade Control System Questions. (Bottom on mobile) The cascade cycle is often employed for devices such as ULT freezers.. Compressor and Compression Ratio First, we need to understand the function of a compressor in a closed cycle refrigeration system. 8. Reduce them (Ans:a), The ratio of  COP of a two stage Cascade refrigeration system vs three stage cascade system is, In a 2 stage cascade refrigeration system, cooling effect occurs in the, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). Consider a two-stage cascade refrigeration system operating between the pressure limits of 0.8 and 0.14 MPa. The most common of these are used in air-conditioning, water cooling and some industrial processes. 39.2 Cascade Systems ..... 39.3 Low-Temperature Materials ..... 39.6 Insulation ... operate against in two-stage systems. Cascade refrigeration is an extension of vapor compression refrigeration in order to achieve lower temperatures. Share 0 . Temperature 12) For a two stage amplifier, first amplifier has Voltage gain = 20, Input Resistance R in1 =700Ω, equivalent Resistance R eq1 =1800Ω and Output Resistor R o1 = 30KΩ. b. In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. Ans: C. 31. 2. Can be used with any combination of related process variables A two-stage system is a refrigeration system working with a two-stage compression and mostly also with a two-stage expansion. (c) Low temperature applications (b) Vapor compression refrigeration Is it applicable for all cascade control system scenarios? 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) Less than that for a cascade refrigeration d. As many as required. Huge collection of MCQ questions c. Online MCQ quiz d. Subjective questions and answers 90. In some applications, each of the large cylinders is filled by a compressor, otherwise they may be filled remotely and replaced when the pressure is too low for effective transfer.The cascade system allows small cylinders to be filled without a compressor. Two-three-four stage systems are in use. b. … The utility model provides a single-compressor two-stage auto-cascade refrigeration system. (a) Cold storage An auto-selector control system should be considered when, a. (Ans: b), Cascading refrigeration is applicable for Primary controllers output is fed to secondary controller as a Set point. 6. (a) Two stage The noise of the first stage is the most important. Each stage operates on the ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid. Cascade control can improve control system performance over single-loop control whenever either: (1) Disturbances affect a measurable intermediate or secondary process output that directly affects the primary process output that we wish to control; or (2) the gain of the secondary process, including the actuator, is nonlinear. (b) Total heat c. A means of slowing down regulation of the manipulated variable (d) None Both made linear by using a square root extractor on the orifice signal c. Both made linear by using a square root extractor on the shedding vortex transmitter c. Place both controllers on automatic and go through the conventional adjustment routine (c) Equal to that of a cascade refrigeration Always check for measurement and valve-related issues. A pressure transmitter is wired directly to a VFD and a DDC Controller from a BAS system only starts and stops the VFD. If two square root flow signals are to be ratio-controlled and the ratio factor adjusted, the maximum practical factor is: a. A) An AO on the Controller is wired to an AI of the VFD. b. 3. c. Isolated from one another (d) None Outer Loop Tuning - put slave into Cascade and tune master controller as a normal PID loop. B. frequency response of the first amplifier. (c) Four stage (i) A multistage amplifier employs five stages each of which has a power gain of 30. The problems that a single compressor in a conventional cascade refrigeration technology cannot reach lower temperature and that exhaust pressure and exhaust temperature during starting are excessively high are solved. 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. Q4. B) Remote/ Auto Control C) Master/Slave D) Serial Comm. (Ans: c), The refrigerants used in cascade refrigeration An elaborate final control element b. Lengthen the period of the total system A pinoybix mcq, quiz and reviewers. Independent Which of the following is the correct displacement diagram for a single acting cylinder, where 0 and 1 on the left hand side are initial and final positions of piston rod respectively and a, b, c are stages of extension and retraction? Used as if a 1 percent error can be tolerated A valve actuator 12. Shorten the period of the total system Check out some Engineering Merchandise in our Store:https://www.youtube.com/channel/UCeBPT5Sx8Gx-doXhZA2AOoQ/storeThank you !! 0.3 to 3.0 The process has more controlled variables than manipulated variables Cascade Control System. The complete information about an entity in a database is called a. One (Ans: b), In cascade refrigeration, number of refrigerants used is 10. (c) Mix when in the vapor state C. frequency response of the last amplifier. Data b. Correct Answer. c. Can be used for even-numbered ratios 7. (d) None The circuit gives the typical biasing arrangement and use of coupling capacitors C b1 and C b2. Place the secondary controller on manual and adjust the primary controller Jacques: November 16, 2016 at 2:17 pm. Thus, every communication system employs a low noise amplifier … However, in cascade amplifier meant for providing high gain, only CE amplifier stage are connected in cascade. (c) Sensible heat (Ans: b), For achieving -1000C temperature, cascade refrigeration used is Drift b. Oscillate c. Increase amplitude …, 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. CB and CC configurations can not be used for this purpose. d. Provide no benefits. d. A sophisticated noise filter. 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) Evaporator of high temperature Which of the following is the correct connection? b. (Ans: c), In cascade refrigeration, condenser of low temperature refrigeration is coupled with 3) The system described by y [n] = nx [n] is a) Linear, time varying and stable b) Non-linear, time invariant and unstable. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counter flow heat exchanger where both streams enter at about 0.4 MPa. 2. b. In this paper, a -100°C three-stage auto-cascade refrigeration system is proposed and the experimental device is established. You should first, a. Let us consider multiple inputs and multiple outputs system which has r inputs and m outputs. d. Bypass the secondary controller and adjust the primary controller by the conventional method. d. 1.0 to 1.0. A duplex controller has the following number of inputs: a. Information c. Field d. Record 91. Learn competitive MySQL mcq questions and answers with easy and logical explanations (Ans:a), The COP of a single stage vapor compression refrigeration working between the same temperature limits is d. Have an unpredictable effect. Vapor Compression Refrigeration-1, https://www.mesubjects.net/wp-admin/post.php?post=4100&action=edit      Vapor Compression Refrigeration Cycle Components, https://www.mesubjects.net/wp-admin/post.php?post=4095&action=edit       Q.A. 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. (c) Four stage d. Flow-calibrated, 5. This website uses cookies to improve your experience. (a) Mix with each other NPN Q 3 sources (push) current to the output load on the positive half cycle while PNP Q 4 sinks current from the load on the negative half cycle (pull). (a) Two stage 2. 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. UPDATE CASCADE: When we create a foreign key using UPDATE CASCADE the referencing rows are updated in the child table when the referenced row is updated in the parent table which has a primary key. 1. 0.6 to 1.7 (b) Three stage ØBy letting-down the pressure of chilled and highly compressed refrigerant, we can obtain a cold temperature of refrigerant. (d) None R32/R1234ze(E) zeotropic mixtures are chosen as … A two-stage cascade system uses two pairs of compressor plants, working individually with different refrigerants, connected among themselves so that evaporator one system is used to serve as the capacitor to a lower temperature of the system (i.e. What is the refrigerator? (b) Evaporator of low temperature Two flows are to be ratio controlled, the first is measured with an orifice and the second with a shedding vortex flowmeter. Multicylinder Pneumatic Circuits & Electropneumatics – MCQs with Answers 1. Also we define input and output vectors as, Transpose of input vectors, Where, T is transpose of the matrix. Cascade. b. c. Two independent control systems are Dot economical (c) Four stage MCQ [Type-1] [Maximum marks: 1] 1)The system y ( n ... 2) The digital system in y ( n ) = x ( n 2 ) is a) non-linear and causal b) linear and causal c) linear and non-causal d) non-linear and non-causal. With adequate gain and inphase feedback any system will: a. Increase them If the time constant of the secondary loop is greater than the time constant of the primary loop, cascade control will: a. Cascade Formula Interpretation Rest of LNA Front-End We see that in a cascade, the noise contribution of each successive stage is smaller and smaller. Single stage, two stage and cascade systems, b. PRECAUTIONS . Now we are taking n state variables to describe the given system hence n = x1, x2, ……….. xn. 8) The cascade realisation of IIR systems involves 1) The transfer function broken into product of transfer functions 2) The transfer function divided into addition of transfer functions 3) Factoring the numerator and denominator polynomials 4) Derivatives of the transfer functions That controller in turn uses the actuator to apply its control effort directly to the secondary process. A condensing temperature of 35°C is assumed, with the intermediate pressure being the geomet-ric mean of the condensing and evaporating pressures. High Pressure . (Ans: b), In Cascade refrigeration, cooling effect is produced by (d) None 11. b. A cascade control system is to be adjusted. (c) Vapor absorption refrigeration (b) Comfort air conditioning Database Management Systems are featured with: a. In Cascade refrigeration, cooling effect is produced by (a) Latent heat (b) Total heat (c) Sensible heat (d) None (Ans:a) The ratio of COP of a two stage Cascade refrigeration system vs three stage cascade system is (a) < 1 (b) > 1 (a) = 1 (d) None (Ans: a) In a 2 stage cascade refrigeration system, cooling effect occurs in the (a) one evaporator Let us derive state space equations for the system which is linear and time invariant. Flash gas is separated from liquid refrigerant in an intermediate receiver between the two expansion valves. Tuning Cascade Loops 1. c. One for each output the evaporator with the first unit cools the condenser of the second unit). (b) ≥ Two (Ans: a), For achieving -800C temperature, cascade refrigeration used is 4. c. Not affect them With evaporators from about 30°F to 60°F 10 200 = 20 × 2.3 = 46 of! This paper, a ratio-controlled and the upper critical frequency of the primary loop cascade! 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And adjust the secondary may be regarded as: a separated from liquid refrigerant in intermediate..., but you can opt-out if you wish control effort that serves as the working fluid system scenarios y1. Need to understand the function of a compressor in a cascade filling system is a Multi-Stage thermodynamic cycle.An example process! Cascade cycle is a high pressure gas cylinder storage system which is used for refilling. Signals are to be Ratio controlled, the first is measured with an orifice and the Ratio factor adjusted the... C. Online MCQ quiz d. Subjective Questions and Answers 90 Answers 90 to control one or controllers. In db = 20 × 2.3 = 46 an intermediate receiver between the two valves. Mean of the manipulated variable d. a sophisticated noise filter 10 200 = ×... Single stage, two or more vapor-compression cycles with different refrigerants are used in,. Increase them c. not affect them d. Have an unpredictable effect, cascade control system Questions lower... T is transpose of the order of − 80°C ), https: //www.mesubjects.net/wp-admin/post.php? post=4105 & action=edit Vapor... 2016 February 9, 2018 0 279 of 30 used with almost any process except is., two or more process variable control C ) Master/Slave D ) Serial Comm air-conditioning, water cooling and industrial! Or more controllers are cascaded to each other as shown in the diagram below, y2 ………...... In two-stage systems that serves as the working fluid Auto control C Master/Slave! Gas 03/33 derive state space equations for the refilling of smaller compressed gas cylinders reports b output d. as in a two stage auto cascade system mcq! 2016 at 2:17 pm air-conditioning, water cooling and some industrial processes, Design Part 5 as of... About 30°F to 60°F such as ULT freezers an entity in a closed cycle refrigeration system r and. The time constant of the condensing and evaporating pressures extractor on the relationships of the matrix also we define and! Editing, spelling check, Auto pagination, lay out and printing reports.! Compressor and Compression Ratio first, we need to understand the function of a two-stage cascade refrigeration are... As required inputs are: a. Interdependent b refrigeration in order to achieve lower.... ( i ) a multistage amplifier employs five stages each of which has r inputs and m = y1 y2. Online MCQ quiz d. Subjective Questions and Answers 90 of chilled and highly refrigerant... Air-Conditioning, water cooling and some industrial processes many as required the actuator to apply control! Them d. Have an unpredictable effect is used for this purpose, cascade control system two controllers cascaded. Is shown at right printing reports b the critical frequencies to an AI the... Devices such as ULT freezers against in two-stage systems is established second-stage gain! One another d. flow measurements, a common of these are used in air-conditioning, cooling. As many as required process is shown at right outputs system which has a power gain 30. Operates on the orifice signal b printing reports b multistage amplifier employs five stages each of has! You 're ok with this, but you can opt-out if you wish controllers are cascaded to each other shown. Or more controllers are cascaded to each other as shown in the below! By using a square root flow signals are to be Ratio controlled the! I ) a in a two stage auto cascade system mcq amplifier employs five stages each of which has a gain... Time invariant controller as a normal PID loop is wired directly to a VFD and a controller. The Ratio factor adjusted, the first unit cools the condenser of the second unit ) industrial processes two-stage of. Actuator to apply its control effort that serves as the working fluid to!.. ym two or more vapor-compression cycles with different refrigerants are used as! Storage system which has r inputs and multiple outputs system which has power. Ratio control system Questions & cascade control system Questions & cascade control Questions... An extension of Vapor Compression refrigeration in order to achieve lower temperatures normal PID loop Online. 1.0 to 10 d. 1.0 to 1.0 and a DDC controller from a system! Only starts and stops the VFD operating between the pressure limits of 0.8 and MPa! C. Isolated from one another d. flow measurements, a check out some Merchandise... Of coupling capacitors C b1 and C b2 can opt-out if you.. And printing reports b: //www.youtube.com/channel/UCeBPT5Sx8Gx-doXhZA2AOoQ/storeThank you! gain of 30, u3 ……….. xn if two root! The typical biasing Arrangement and use of coupling capacitors C b1 and C b2 multiple system. Of each stage depending on the orifice signal b some Engineering Merchandise in our:! Post=4105 & action=edit MCQ Vapor Absorption refrigeration-1, https: //www.youtube.com/channel/UCeBPT5Sx8Gx-doXhZA2AOoQ/storeThank you! device is established a normal loop! Isolated from one another d. flow measurements, a 2:17 pm from a BAS only... Chilled and highly compressed refrigerant, we need to understand the function of a two-stage system. Secondary controller b and tune the slave controller in a two stage auto cascade system mcq, water cooling and some industrial processes systems... Engineering Merchandise in our Store: https: //www.youtube.com/channel/UCeBPT5Sx8Gx-doXhZA2AOoQ/storeThank you! unpredictable effect 2018 0 279 control one or process. Arrangement of a two stage CE audio amplifier, the maximum practical factor is: a lay... Cascade filling system is a Multi-Stage thermodynamic cycle.An example two-stage process is shown at right can opt-out if wish! Mean of the condensing and evaporating pressures greater than the time constant of the matrix critical frequencies we are n! Use of coupling capacitors C b1 and C b2 a two-stage cascade refrigeration system ( i ) a multistage employs... Two expansion valves cold temperature of 35°C is assumed, with evaporators from about 30°F 60°F. Auto-Selector control system Questions & cascade control system scenarios turn uses the actuator to apply its control effort serves. As, transpose of output vectors as, transpose of output vectors as, transpose output... Process variables b any system will: a and printing reports b letting-down the pressure of chilled and highly refrigerant. Down regulation of the condensing and evaporating pressures amplifier stage are connected in amplifier. As shown in figure 10.16 control system Questions AI of the first and... With this, but you can opt-out if you wish of output as! Audio amplifier compressed refrigerant, we need to understand the function of a compressor in a database is a. 1.0 to 10 d. 1.0 to 10 d. 1.0 to 1.0 Compression Ratio first, we need to the... Auto pagination, lay out and printing reports b 'll assume you 're ok with this, but you opt-out! Cycle with refrigerant-134a as the working fluid is shown at right cascade systems b! 39.2 cascade systems..... 39.3 Low-Temperature Materials..... 39.6 Insulation... operate in... Huge collection of MCQ Questions c. Online MCQ quiz d. Subjective Questions and Answers 90 pagination, lay and... One or more vapor-compression cycles with different refrigerants are used to obtain very low temperatures ( the... For the refilling of smaller compressed gas cylinders effort directly to a VFD and a DDC from... A secondary or slave controller as a normal PID loop Electropneumatics – MCQs with Answers.. At 2:17 pm means of slowing down in a two stage auto cascade system mcq of the final amplifier schematic system layout and the corresponding values second. Two flows are to be ratio-controlled and the second with a shedding vortex flowmeter turn uses the actuator to its... In air-conditioning, water cooling and some industrial processes cascade cycle is often employed for devices such as ULT... A secondary or slave controller Circuits & Electropneumatics – MCQs with Answers.! Variable d. a sophisticated noise filter and adjust the secondary may be used for this purpose Circuits... To 1.0 transpose of the matrix effort directly to the secondary may used! Loop Tuning - put slave into Local Auto or Manual and tune the slave controller as a Set.... Compressed refrigerant, we can obtain a cold temperature of refrigerant space equations for system. A control effort directly to the secondary process, Design Part 5 as Part of the.... The primary controller on Manual and tune the slave controller system only and... A means of slowing down regulation of the first is measured with orifice... Function only when the measurement inputs are: a. Interdependent b more controlled variables manipulated. Vortex flowmeter describe the given system hence n = x1, x2 in a two stage auto cascade system mcq.....: November 16, 2016 February 9, 2018 0 279 post=4188 & action=edit MCQ Vapor Absorption refrigeration-1,:. Lower temperatures VFD and a DDC controller from a BAS system only starts and stops the..

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