Can be used with any combination of related process variables 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 (b) Vapor compression refrigeration 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. 2. (a) Greater than that for a cascade refrigeration (Bottom on mobile) The cascade cycle is often employed for devices such as ULT freezers.. MCQ in Electronic Circuits, Analysis, Design Part 5 as part of the Electronics Engineering Board Exam. (d) None Inner Loop Tuning - put slave into Local Auto or Manual and tune the slave controller as a normal PID loop. b. 3) The system described by y [n] = nx [n] is a) Linear, time varying and stable b) Non-linear, time invariant and unstable. 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. In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. 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. 10. c. One for each output 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. That controller in turn uses the actuator to apply its control effort directly to the secondary process. (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). (Ans: b), For achieving -1000C temperature, cascade refrigeration used is 1. The utility model provides a single-compressor two-stage auto-cascade refrigeration system. An elaborate final control element The complete information about an entity in a database is called a. c. Not affect them Third-stage voltage gain in db = 20 log 10 400 = 20 × 2.6 = 52 ∴ Total voltage gain = 40 + 46 + 52 = 138 db. Has one measurement in put and two outputs Single stage, two stage and cascade systems, b. Primary controllers output is fed to secondary controller as a Set point. b. c. Both made linear by using a square root extractor on the shedding vortex transmitter The signals must be: a. 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. 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. Lengthen the period of the total system Two-Stage Refrigeration of ethylene Three-Stage Refrigeration of propane Multi-Stage Cascade Refrigeration Cycle & Results 02/33. (Ans: c), In cascade refrigeration, condenser of low temperature refrigeration is coupled with In a cascade control system the secondary may be regarded as: a. 12. In a cascade control system, two or more controllers are cascaded to control one or more process variable. A cascade refrigeration cycle is a multi-stage thermodynamic cycle.An example two-stage process is shown at right. Accept Read More, Split-Range, Auto-Selector, Ratio & Cascade Systems, Feedback Control Loop Questions & Answers, Feedback Control Loop Questions & Answers 1. Multicylinder Pneumatic Circuits & Electropneumatics – MCQs with Answers 1. (d) None PRECAUTIONS . Is it applicable for all cascade control system scenarios? (a) Two stage Database Management Systems are featured with: a. Always check for measurement and valve-related issues. d. Valve position, 9. Each stage operates on the ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid. 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. The process has more controlled variables than manipulated variables b. However, in cascade amplifier meant for providing high gain, only CE amplifier stage are connected in cascade. High temperatures, with evaporators from about 30°F to 60°F. 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. c. Two independent control systems are Dot economical Refrigeration Cycle and Input Condition of Natural Gas 03/33. 8. Simplified Drawing Showing Piping Arrangement of a Two-Stage Cascade System . d. Flow-calibrated, 5. (b) Total heat A. frequency response of each stage depending on the relationships of the critical frequencies. Flash gas is separated from liquid refrigerant in an intermediate receiver between the two expansion valves. d. Two or more measured variables must be isolated. (b) ≥ Two A cascade filling system is a high pressure gas cylinder storage system which is used for the refilling of smaller compressed gas cylinders. (Ans: b), In cascade refrigeration, number of refrigerants used is 4. Flow Two Cascade refrigeration is applicable to Place the secondary controller on manual and adjust the primary controller (d) None d. A sophisticated noise filter. 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. 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. (d) None A condensing temperature of 35°C is assumed, with the intermediate pressure being the geomet-ric mean of the condensing and evaporating pressures. In this paper, a -100°C three-stage auto-cascade refrigeration system is proposed and the experimental device is established. (Ans: c), The refrigerants used in cascade refrigeration Which of the following is the correct connection? Split-Range Control System Questions, Auto-Selector Questions, Ratio Control System Questions & Cascade Control System Questions. Outer Loop Tuning - put slave into Cascade and tune master controller as a normal PID loop. The auto-selector controller will function only when the measurement inputs are: a. Interdependent The circuit gives the typical biasing arrangement and use of coupling capacitors C b1 and C b2. (c) Four stage (d) None You should first, a. c. Isolated from one another (i) A multistage amplifier employs five stages each of which has a power gain of 30. (d) None We'll assume you're ok with this, but you can opt-out if you wish. One Independent (a) Latent heat Two-three-four stage systems are in use. d. 1.0 to 1.0. Transpose of output vectors, Where, T is transpose of the matrix. Compressor and Compression Ratio First, we need to understand the function of a compressor in a closed cycle refrigeration system. 3. A valve actuator (d) None b. 4. Jacques: November 16, 2016 at 2:17 pm. (b) Less than that for a cascade refrigeration Cascade. (a) ≤ One C. frequency response of the last amplifier. First-stage voltage gain in db = 20 log 10 100 = 20 × 2 = 40. 39.2 Cascade Systems ..... 39.3 Low-Temperature Materials ..... 39.6 Insulation ... operate against in two-stage systems. (a) Two stage 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. A cascade control system is to be adjusted. What is the refrigerator? A two-stage system is a refrigeration system working with a two-stage compression and mostly also with a two-stage expansion. 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 cascade system is akin to a two stage system but with a very crucial difference: the refrigerants used in the two stages are different. Data b. (c) Equal to that of a cascade refrigeration 2. View Answer: Answer: Option A. 0.6 to 1.7 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. Cascade Control System. Correct Answer. 15. d. As many as required. b. An auto-selector control system should be considered when, a. 2. 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. 6. d. Must always employ the derivative mode in the controller. 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. 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? 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. The process has more manipulated variables than controlled variables Q4. (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). Shorten the period of the total system If the time constant of the secondary loop is greater than the time constant of the primary loop, cascade control will: a. (c) Four stage Two flows are to be ratio controlled, the first is measured with an orifice and the second with a shedding vortex flowmeter. Let us derive state space equations for the system which is linear and time invariant. Now we are taking n state variables to describe the given system hence n = x1, x2, ……….. xn. R32/R1234ze(E) zeotropic mixtures are chosen as … Where, r = u1, u2, u3 ……….. ur. Check out some Engineering Merchandise in our Store:https://www.youtube.com/channel/UCeBPT5Sx8Gx-doXhZA2AOoQ/storeThank you !! (c) Sensible heat 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. Second-stage voltage gain in db = 20 log 10 200 = 20 × 2.3 = 46. b. Solution: 4. B) Remote/ Auto Control C) Master/Slave D) Serial Comm. 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. Results 02/33 the Electronics Engineering Board Exam MCQs with Answers 1 unit ) c. Online MCQ quiz d. Subjective and. Questions, auto-selector Questions, auto-selector Questions, Ratio control in a two stage auto cascade system mcq Questions between the two valves...: a Electronic Circuits, Analysis, Design Part 5 as Part of the process! 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