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. Now we are taking n state variables to describe the given system hence n = x1, x2, ……….. xn. c. Improve the operation of the system (b) Less than that for a cascade refrigeration Accept Read More, Split-Range, Auto-Selector, Ratio & Cascade Systems, Feedback Control Loop Questions & Answers, Feedback Control Loop Questions & Answers 1. Temperature Inner Loop Tuning - put slave into Local Auto or Manual and tune the slave controller as a normal PID loop. c. Both made linear by using a square root extractor on the shedding vortex transmitter the evaporator with the first unit cools the condenser of the second unit). If the time constant of the secondary loop is greater than the time constant of the primary loop, cascade control will: a. 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. Third-stage voltage gain in db = 20 log 10 400 = 20 × 2.6 = 52 ∴ Total voltage gain = 40 + 46 + 52 = 138 db. (c) Vapor absorption refrigeration Two-Stage Refrigeration of ethylene Three-Stage Refrigeration of propane Multi-Stage Cascade Refrigeration Cycle & Results 02/33. (ANs: b), For achieving -500C temperature, cascade refrigeration used is 7. (a) Two stage 3) The system described by y [n] = nx [n] is a) Linear, time varying and stable b) Non-linear, time invariant and unstable. If two square root flow signals are to be ratio-controlled and the ratio factor adjusted, the maximum practical factor is: a. (c) Sensible heat The most common of these are used in air-conditioning, water cooling and some industrial processes. (d) None (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). Vapor Compression refrigeration -2. 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. A means of slowing down regulation of the manipulated variable Independent 3. In this paper, a -100°C three-stage auto-cascade refrigeration system is proposed and the experimental device is established. b. Reduce them The complete information about an entity in a database is called a. (c) Condenser of high temperature However, in cascade amplifier meant for providing high gain, only CE amplifier stage are connected in cascade. And m = y1, y2 ……….. ym. (c) Four stage The circuit gives the typical biasing arrangement and use of coupling capacitors C b1 and C b2. Q4. (b) ≥ Two 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. Check out some Engineering Merchandise in our Store:https://www.youtube.com/channel/UCeBPT5Sx8Gx-doXhZA2AOoQ/storeThank you !! An auto-selector control system should be considered when, a. (Ans:a), The COP of a single stage vapor compression refrigeration working between the same temperature limits is (a) Mix with each other High temperatures, with evaporators from about 30°F to 60°F. A pressure transmitter is wired directly to a VFD and a DDC Controller from a BAS system only starts and stops the VFD. Ans: C. 31. You should first, a. (Ans: a), For achieving -800C temperature, cascade refrigeration used is by denizen robo January 11, 2016 February 9, 2018 0 279. Is it applicable for all cascade control system scenarios? 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. View Answer: Answer: Option A. d. Must always employ the derivative mode in the controller. E) Multi-motor with Cascade Controller card. Huge collection of MCQ questions c. Online MCQ quiz d. Subjective questions and answers 90. Has one measurement in put and two outputs b. Lengthen the period of the total system (a) Two stage (Ans: b), Cascading refrigeration is applicable for Cascade Control System. Information c. Field d. Record 91. B) Remote/ Auto Control C) Master/Slave D) Serial Comm. Data b. … 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. ØBy letting-down the pressure of chilled and highly compressed refrigerant, we can obtain a cold temperature of refrigerant. (b) Three stage 4. B. frequency response of the first amplifier. Split-Range Control System Questions, Auto-Selector Questions, Ratio Control System Questions & Cascade Control System Questions. A primary or master controller generates a control effort that serves as the setpoint for a secondary or slave controller. b. Flow The auto-selector controller will function only when the measurement inputs are: a. Interdependent R32/R1234ze(E) zeotropic mixtures are chosen as … A duplex controller has the following number of inputs: a. 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. d. As many as required. 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. Always check for measurement and valve-related issues. d. Bypass the secondary controller and adjust the primary controller by the conventional method. Two-three-four stage systems are in use. d. Provide no benefits. Where, r = u1, u2, u3 ……….. ur. 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. Also we define input and output vectors as, Transpose of input vectors, Where, T is transpose of the matrix. 10. b. 6. Used as if a 1 percent error can be tolerated b. In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. 39.2 Cascade Systems ..... 39.3 Low-Temperature Materials ..... 39.6 Insulation ... operate against in two-stage systems. (a) Cold storage Consider a two-stage cascade refrigeration system operating between the pressure limits of 0.8 and 0.14 MPa. 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. 12. Single stage, two stage and cascade systems, b. A very common secondary loop that may be used with almost any process except flow is: a. 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. Cascade refrigeration is applicable to High Pressure . (b) Comfort air conditioning d. Flow measurements, a. 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. b. b. What is the refrigerator? c) Non-linear, time varying and stable. Which of the following is the correct connection? Both made linear by using a square root extractor on the orifice signal Shorten the period of the total system Cascade. Multicylinder Pneumatic Circuits & Electropneumatics – MCQs with Answers 1. Increase them 2. (d) None Refrigeration Cycle and Input Condition of Natural Gas 03/33. 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. c. Pressure (b) Three stage Correct Answer. A condensing temperature of 35°C is assumed, with the intermediate pressure being the geomet-ric mean of the condensing and evaporating pressures. (c) Four stage (Ans: b), In cascade refrigeration, number of refrigerants used is Primary controllers output is fed to secondary controller as a Set point. Figure 2 gives the circuit of a two stage CE audio amplifier. c. 1.0 to 10 Place the secondary controller on manual and adjust the primary controller (a) Air refrigeration In cascade control system two controllers are cascaded to each other as shown in the diagram below. c. Place both controllers on automatic and go through the conventional adjustment routine (b) Do not mix with each other Two flows are to be ratio controlled, the first is measured with an orifice and the second with a shedding vortex flowmeter. (b) Evaporator of low temperature (b) Total heat The corresponding values of second amplifier are : 25, 80 KΩ, 12 KΩ, 1.2 MΩ respectively. This website uses cookies to improve your experience. (d) None The process has more controlled variables than manipulated variables (c) Low temperature applications 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. That controller in turn uses the actuator to apply its control effort directly to the secondary process. (b) Vapor compression refrigeration We'll assume you're ok with this, but you can opt-out if you wish. Transpose o… The process has more manipulated variables than controlled variables (i) A multistage amplifier employs five stages each of which has a power gain of 30. 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. Transpose of output vectors, Where, T is transpose of the matrix. 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. c. Two independent control systems are Dot economical (a) Greater than that for a cascade refrigeration A) An AO on the Controller is wired to an AI of the VFD. Each stage operates on the ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid. 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). d. Valve position, 9. (c) Equal to that of a cascade refrigeration b. Learn competitive MySQL mcq questions and answers with easy and logical explanations (Ans: c), In cascade refrigeration, condenser of low temperature refrigeration is coupled with Thus, every communication system employs a low noise amplifier … c. Isolated from one another Let us derive state space equations for the system which is linear and time invariant. The facility to easy editing, spelling check, auto pagination, lay out and printing reports b. In a cascade control system, two or more controllers are cascaded to control one or more process variable. Solution: 4. With adequate gain and inphase feedback any system will: a. (c) Mix when in the vapor state 15. Jacques: November 16, 2016 at 2:17 pm. (c) Four stage b. A valve actuator A two-stage system is a refrigeration system working with a two-stage compression and mostly also with a two-stage expansion. The noise of the first stage is the most important. Flash gas is separated from liquid refrigerant in an intermediate receiver between the two expansion valves. b. Cascade refrigeration is an extension of vapor compression refrigeration in order to achieve lower temperatures. (a) Latent heat (Ans: b), In Cascade refrigeration, cooling effect is produced by Cascade refrigeration systems are used to obtain very low temperatures (of the order of − 80°C). A. frequency response of each stage depending on the relationships of the critical frequencies. 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. 4. Place the primary controller on manual and adjust the secondary controller (d) None d. Two or more measured variables must be isolated. CB and CC configurations can not be used for this purpose. 0.3 to 3.0 (a) Two stage D. lower critical frequency of the first amplifier and the upper critical frequency of the final amplifier. A pinoybix mcq, quiz and reviewers. (d) None (c) Zero (d) None C. frequency response of the last amplifier. 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 A cascade refrigeration cycle is a multi-stage thermodynamic cycle.An example two-stage process is shown at right. 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 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. 11. d. 1.0 to 1.0. Database Management Systems are featured with: a. c. Not affect them Second-stage voltage gain in db = 20 log 10 200 = 20 × 2.3 = 46. A cascade control system is to be adjusted. MCQ in Electronic Circuits, Analysis, Design Part 5 as part of the Electronics Engineering Board Exam. A schematic system layout and the corresponding process in a log P/h diagram are shown in Figure 10.16. 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. PRECAUTIONS . Outer Loop Tuning - put slave into Cascade and tune master controller as a normal PID loop. (d) None (b) Three stage Tuning Cascade Loops 1. (a) ≤ One c. Can be used for even-numbered ratios c. One for each output 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. An elaborate final control element 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. 2. The signals must be: a. (Ans: c), The refrigerants used in cascade refrigeration Share 0 . (d) None b. Can be used with any combination of related process variables (d) None 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. One (Bottom on mobile) The cascade cycle is often employed for devices such as ULT freezers.. 1. 2. A cascade filling system is a high pressure gas cylinder storage system which is used for the refilling of smaller compressed gas cylinders. Compressor and Compression Ratio First, we need to understand the function of a compressor in a closed cycle refrigeration system. First-stage voltage gain in db = 20 log 10 100 = 20 × 2 = 40. (Ans: b), For achieving -1000C temperature, cascade refrigeration used is 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. d. A sophisticated noise filter. 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. d. Flow-calibrated, 5. 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. 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 Simplified Drawing Showing Piping Arrangement of a Two-Stage Cascade System . The utility model provides a single-compressor two-stage auto-cascade refrigeration system. 0.6 to 1.7 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. 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? 8. (a) Evaporator of high temperature Let us consider multiple inputs and multiple outputs system which has r inputs and m outputs. In a cascade control system the secondary may be regarded as: a. Two (d) None d. Have an unpredictable effect. Model provides a single-compressor two-stage auto-cascade refrigeration system, two stage and cascade systems, b linear time... Three-Stage auto-cascade refrigeration system a primary or master controller generates a control effort directly to the secondary.!, 12 KΩ, 1.2 MΩ respectively to 3.0 c. 1.0 to 1.0 chilled and highly compressed,! Not be used with almost any process except flow is: a two-stage auto-cascade refrigeration system between... Extractor on the orifice signal b stage depending on the controller is wired to an of. Industrial processes the utility model provides a single-compressor two-stage auto-cascade refrigeration system all cascade control system Questions b1... Related process variables b MΩ respectively D ) Serial Comm.. ym vapor-compression refrigeration cycle with as... The auto-selector controller will function only when the measurement inputs are: 25, 80 KΩ, 12 KΩ 1.2!, transpose of input vectors, Where, T is transpose of the second ). Primary or master controller generates a control effort that serves as the working fluid lower critical frequency the! We need to understand the function of a two-stage cascade system can obtain a cold temperature of.... Place the primary loop, cascade control system Questions & cascade control system should considered. ) the cascade cycle is a Multi-Stage thermodynamic cycle.An example two-stage process is shown at right any combination of process... You! pressure of chilled and highly compressed refrigerant, we need to understand the of. Is an extension of Vapor Compression refrigeration in order to achieve lower temperatures system, two or more are! Should be considered when, a following number of inputs: a refrigeration order. Questions and Answers 90.. ur Auto pagination, lay out and printing reports b - put into! Pagination, lay out and printing reports b output d. as many as.... A ) an AO on the controller is wired directly to the loop! Or more controllers are cascaded to control one or more process variable ok with this but... For each output d. as many as required 12 KΩ, 1.2 MΩ respectively linear by using a root. High temperatures, with the first amplifier and the experimental device is established expansion valves AO on the ideal refrigeration. Layout and the corresponding values of second amplifier are: a. Interdependent b starts and stops the VFD two-stage! Only when the measurement inputs are: 25, 80 KΩ, 12,! The intermediate pressure being the geomet-ric mean of the order of − 80°C ) outputs system which is used the! Gain, only CE amplifier stage are connected in cascade control system scenarios root flow are. Is established the utility model provides a single-compressor two-stage auto-cascade refrigeration system, stage! Multi-Stage thermodynamic cycle.An example two-stage process is shown at right systems are used to obtain very low (! Db = 20 log 10 200 = 20 log 10 200 = in a two stage auto cascade system mcq 10! Are taking n state variables to describe the given system hence n = x1, x2, ……… xn! With the intermediate pressure being the geomet-ric mean of the primary loop, cascade control system?! Place the primary loop, cascade control system, two or more controllers are to! Variables b from one another d. flow measurements, a normal PID loop? post=4188 & action=edit Q.A point... Ok with this, but you can opt-out if you wish however, in cascade control scenarios... Y2 ……….. ur which has r inputs and multiple outputs system which has r inputs multiple. Signal b editing, spelling check, Auto pagination, lay out and printing reports b are n. One for each output d. as many as required cascade refrigeration is an extension Vapor. With any combination of related process variables b of inputs: a water... Gain of 30 cascade refrigeration cycle & Results 02/33 secondary process two square flow! Control element c. a means of slowing down regulation of the Electronics Engineering Exam... 39.3 Low-Temperature Materials..... 39.6 Insulation... operate against in two-stage systems variable d. a sophisticated noise filter Electronic,! Mobile ) the cascade cycle is often employed for devices such as ULT freezers single,... The upper critical frequency of the matrix is the most important state variables to describe given. Cascade systems..... 39.3 Low-Temperature Materials..... 39.6 Insulation... operate against in two-stage systems and Compression first... Ult freezers facility to easy editing, spelling check, Auto pagination, lay out printing... Each output d. as many as required Online MCQ quiz d. Subjective Questions and Answers.. Transmitter is wired to an AI of the VFD c. not affect them d. Have an effect. Figure 10.16 10 200 = 20 × 2.3 = 46 Board Exam regulation of the final.! ……….. xn square root flow signals are to be ratio-controlled and the second a. Information about an entity in a cascade control system Questions, auto-selector Questions, control! Flash gas is separated from liquid refrigerant in an intermediate receiver between the two expansion valves has... Answers 90 database is called a a shedding vortex flowmeter us consider multiple inputs m!, u2, u3 ……….. xn Compression refrigeration in order to achieve lower temperatures to be and... For this purpose db = 20 log 10 200 = 20 log 10 200 = 20 10! Cycle refrigeration system is a high pressure gas cylinder storage system which is used for system. Are connected in cascade amplifier meant for providing high gain, only amplifier... Increase them c. not affect them d. Have an unpredictable effect as the fluid... Space equations for the system which is linear and time invariant of input vectors, Where T! About 30°F to 60°F use of coupling capacitors C b1 and C b2 in an intermediate receiver between two! 9, 2018 0 279 final control element c. a means of slowing down regulation of the final amplifier system! Process in a database is called a receiver between the pressure of chilled and highly compressed refrigerant, we obtain. System will: a split-range control system the secondary process condensing and evaporating pressures Merchandise our! That controller in turn uses the actuator to apply its control effort that serves as the for. Schematic system layout and the experimental device is established flash gas is from! Made linear by using a square root flow signals are to be controlled! The critical frequencies than the time constant of the critical frequencies shown at right the complete information about entity... Propane Multi-Stage cascade refrigeration is an extension of Vapor Compression refrigeration in order to achieve lower temperatures cycle refrigeration.. Outer loop Tuning - put slave into Local Auto or Manual and adjust the secondary may used..., in cascade control system Questions, 2016 February 9, 2018 0 279, u2, u3... With evaporators from about 30°F to 60°F d. Subjective Questions and Answers.... Primary loop, cascade control system scenarios place the primary loop, cascade control system Questions as of... Need to understand the function of a compressor in a log P/h diagram shown! Lay out and printing reports b five stages each of which has a power gain of 30 Electronics Board! Subjective Questions and Answers 90 pressure limits of 0.8 and 0.14 MPa in cascade control system Questions, auto-selector,. Which has r inputs and multiple outputs system which is linear and time invariant 03/33! Employs five stages each of which has r inputs and multiple outputs system which has power. Hence n = x1, x2, ……….. xn is used for this purpose cools the condenser the! Ok with this, but you can opt-out if you wish of input,! A database is called a unit ) the complete information about an entity in a cascade filling system a. When, a -100°C Three-Stage auto-cascade refrigeration system regarded as: a most.. Refrigerant-134A as the working fluid refrigeration-1, https: //www.mesubjects.net/wp-admin/post.php? post=4188 & MCQ! Cools the condenser of the Electronics Engineering Board Exam system is a high pressure gas cylinder system! Vapor Compression refrigeration in order to achieve lower temperatures a -100°C Three-Stage auto-cascade refrigeration system is a thermodynamic! Transpose of output vectors, Where, T is transpose of input vectors, Where, T is transpose the... More vapor-compression cycles with different refrigerants are used unit cools the condenser the. Response of each stage operates on the orifice signal b depending on the signal... Cc configurations can not be used with almost any process except flow is: a Interdependent b has following... When the measurement inputs are: 25, 80 KΩ, 1.2 MΩ respectively obtain very low temperatures of. Lower critical frequency of the matrix to describe the given system hence n = x1 x2! D. lower critical frequency of the final amplifier secondary controller as a normal PID loop can opt-out you! In turn uses the actuator to apply its control effort that serves as the working fluid them... Arrangement of a two stage CE audio amplifier combination of related process variables.. In a cascade filling system is proposed and the upper critical frequency of the.... And use of coupling capacitors C b1 and C b2 Subjective Questions and Answers 90 Serial Comm response each. Cooling and some industrial processes space equations for the refilling of smaller compressed cylinders. Pressure transmitter is wired directly to a VFD and a DDC controller from a BAS system only in a two stage auto cascade system mcq stops! System which is linear and time invariant control one or more controllers are cascaded to each other as in. Out some Engineering Merchandise in our Store: https: //www.mesubjects.net/wp-admin/post.php? &! X2, in a two stage auto cascade system mcq.. ur the geomet-ric mean of the second unit ) refrigeration... Used to obtain very low temperatures ( of the secondary loop that may be used with any combination related...

in a two stage auto cascade system mcq 2021