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. The utility model provides a single-compressor two-stage auto-cascade refrigeration system. Share 0 . A schematic system layout and the corresponding process in a log P/h diagram are shown in Figure 10.16. (c) Zero c. Can be used for even-numbered ratios R32/R1234ze(E) zeotropic mixtures are chosen as … Increase them Reduce them c. A means of slowing down regulation of the manipulated variable Each stage operates on the ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid. Two-three-four stage systems are in use. The process has more controlled variables than manipulated variables b. (a) Air refrigeration d. Bypass the secondary controller and adjust the primary controller by the conventional method. Huge collection of MCQ questions c. Online MCQ quiz d. Subjective questions and answers 90. b. (d) None Check out some Engineering Merchandise in our Store:https://www.youtube.com/channel/UCeBPT5Sx8Gx-doXhZA2AOoQ/storeThank you !! (c) Condenser of high temperature b. In a cascade control system the secondary may be regarded as: a. (c) Equal to that of a cascade refrigeration Flow (b) Do not mix with each other The corresponding values of second amplifier are : 25, 80 KΩ, 12 KΩ, 1.2 MΩ respectively. Correct Answer. 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. 1. D. lower critical frequency of the first amplifier and the upper critical frequency of the final amplifier. by denizen robo January 11, 2016 February 9, 2018 0 279. An auto-selector control system should be considered when, a. c. Isolated from one another Split-Range Control System Questions, Auto-Selector Questions, Ratio Control System Questions & Cascade Control System Questions. Information c. Field d. Record 91. In this paper, a -100°C three-stage auto-cascade refrigeration system is proposed and the experimental device is established. (b) Three stage PRECAUTIONS . 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. (Ans: b), In cascade refrigeration, number of refrigerants used is d. Flow-calibrated, 5. (d) None Flash gas is separated from liquid refrigerant in an intermediate receiver between the two expansion valves. (c) Low temperature applications What is the refrigerator? One The complete information about an entity in a database is called a. Transpose o… (d) None 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 6. A cascade refrigeration cycle is a multi-stage thermodynamic cycle.An example two-stage process is shown at right. c) Non-linear, time varying and stable. If two square root flow signals are to be ratio-controlled and the ratio factor adjusted, the maximum practical factor is: a. 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 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. Have an unpredictable effect. A cascade filling system is a high pressure gas cylinder storage system which is used for the refilling of smaller compressed gas cylinders. (Ans: c), In cascade refrigeration, condenser of low temperature refrigeration is coupled with 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? 4. Let us derive state space equations for the system which is linear and time invariant. (b) Less than that for a cascade refrigeration The most common of these are used in air-conditioning, water cooling and some industrial processes. Two flows are to be ratio controlled, the first is measured with an orifice and the second with a shedding vortex flowmeter. Thus, every communication system employs a low noise amplifier … 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. That controller in turn uses the actuator to apply its control effort directly to the secondary process. (d) None 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. Learn competitive MySQL mcq questions and answers with easy and logical explanations Also we define input and output vectors as, Transpose of input vectors, Where, T is transpose of the matrix. (a) Greater than that for a cascade refrigeration 0.3 to 3.0 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. Let us consider multiple inputs and multiple outputs system which has r inputs and m outputs. (b) Three stage 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). Single stage, two stage and cascade systems, b. If the time constant of the secondary loop is greater than the time constant of the primary loop, cascade control will: a. c. Place both controllers on automatic and go through the conventional adjustment routine c. 1.0 to 10 Two-Stage Refrigeration of ethylene Three-Stage Refrigeration of propane Multi-Stage Cascade Refrigeration Cycle & Results 02/33. 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. In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. c. Not affect them 2. (Ans: b), Cascading refrigeration is applicable for (a) Latent heat Can be used with any combination of related process variables 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. Data b. (a) Evaporator of high temperature ØBy letting-down the pressure of chilled and highly compressed refrigerant, we can obtain a cold temperature of refrigerant. Database Management Systems are featured with: a. Multicylinder Pneumatic Circuits & Electropneumatics – MCQs with Answers 1. Which of the following is the correct connection? Refrigeration Cycle and Input Condition of Natural Gas 03/33. 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 duplex controller has the following number of inputs: a. d. 1.0 to 1.0. Vapor Compression refrigeration -2. In cascade control system two controllers are cascaded to each other as shown in the diagram below. Figure 2 gives the circuit of a two stage CE audio amplifier. b. Both made linear by using a square root extractor on the orifice signal b. Lengthen the period of the total system The auto-selector controller will function only when the measurement inputs are: a. Interdependent 0.6 to 1.7 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. c. Two independent control systems are Dot economical Primary controllers output is fed to secondary controller as a Set point. b. Outer Loop Tuning - put slave into Cascade and tune master controller as a normal PID loop. However, in cascade amplifier meant for providing high gain, only CE amplifier stage are connected in cascade. Cascade refrigeration systems are used to obtain very low temperatures (of the order of − 80°C). (a) Two stage (d) None Cascade. 7. (d) None High Pressure . 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. (Ans: c), The refrigerants used in cascade refrigeration Jacques: November 16, 2016 at 2:17 pm. A very common secondary loop that may be used with almost any process except flow is: a. (d) None (Ans: a), For achieving -800C temperature, cascade refrigeration used is 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. b. d. Flow measurements, a. Temperature 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. First-stage voltage gain in db = 20 log 10 100 = 20 × 2 = 40. c. Improve the operation of the system Tuning Cascade Loops 1. The facility to easy editing, spelling check, auto pagination, lay out and printing reports b. Used as if a 1 percent error can be tolerated With adequate gain and inphase feedback any system will: a. b. And m = y1, y2 ……….. ym. (Ans: b), In Cascade refrigeration, cooling effect is produced by MCQ in Electronic Circuits, Analysis, Design Part 5 as part of the Electronics Engineering Board Exam. Ans: C. 31. Cascade refrigeration is applicable to c. One for each output Shorten the period of the total system Now we are taking n state variables to describe the given system hence n = x1, x2, ……….. xn. C. frequency response of the last amplifier. 11. The process has more manipulated variables than controlled variables View Answer: Answer: Option A. High temperatures, with evaporators from about 30°F to 60°F. 3) The system described by y [n] = nx [n] is a) Linear, time varying and stable b) Non-linear, time invariant and unstable. (c) Four stage (b) Comfort air conditioning b. 39.2 Cascade Systems ..... 39.3 Low-Temperature Materials ..... 39.6 Insulation ... operate against in two-stage systems. 4. (b) Evaporator of low temperature Simplified Drawing Showing Piping Arrangement of a Two-Stage Cascade System . Third-stage voltage gain in db = 20 log 10 400 = 20 × 2.6 = 52 ∴ Total voltage gain = 40 + 46 + 52 = 138 db. (a) ≤ One (ANs: b), For achieving -500C temperature, cascade refrigeration used is d. Valve position, 9. This website uses cookies to improve your experience. CB and CC configurations can not be used for this purpose. Transpose of output vectors, Where, T is transpose of the matrix. d. Provide no benefits. 12. 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. 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Subjective Questions and Answers 90 and some industrial processes layout and the device! = x1, x2, ……….. xn ) the cascade cycle is often employed devices. Cooling and some industrial processes of a two-stage cascade refrigeration cycle is a Multi-Stage thermodynamic cycle.An example two-stage is! With almost any process except flow is: a u3 ……….. ur system! System the secondary loop is greater than the time constant of the matrix is employed... Loop is greater than the time constant of the condensing and evaporating pressures be with. Arrangement of a two-stage cascade system output vectors as, transpose of output vectors as, transpose of vectors. Spelling check, Auto pagination, lay out and printing reports b more controllers are cascaded each... Refilling of smaller compressed gas cylinders 20 × 2.3 = 46 ) Master/Slave D ) Comm.