Description : What Is The Difference Between A Rotary Screw Compressor And A Reciprocating Compressors?
Last Answer : A rotary screw compressor is one that utilizes two intermeshing helical rotors to trap a volume of air, then compress it to a higher pressure. Rotary screw compressors can be run at lower ... piston compressor (aka reciprocating) uses pistons driven by a crankshaft to deliver air at high pressure.
Description : What is the best refrigeration compressors?
Last Answer : There are many kinds of refrigeration compressors, depending on the needs of the consumer. Regardless of whether you have a standard fridge or a walk-in freezer, it is important to purchase ... is available here: http://oee.nrcan.gc.ca/industrial/equipment/commercial-refrigeration/index.cfm?attr=24
Description : wattage of air compressors?
Last Answer : The average air compressor uses only about 120v. Which is the average house socket. Thus using about 400 Watts of power.
Description : Rotary compressors are used for delivering A. Small quantities of air at high pressure B. Large quantities of air at high pressure C. Small quantities of air at low pressure D. Large quantities of air at low pressure
Last Answer : ANSWER : D
Description : Which one of the following statements is correct? A. Reciprocating compressors are used to supply large quantities of air at a lower pressure ratio B. Centrifugal compressors are used to supply ... . Centrifugal compressors cannot be run at high speed because of impeller, diffuser and casing.
Last Answer : ANSWER : B
Description : Which one of the following types of impeller vanes are most commonly used in centrifugal type compressors? A. Forward curved B. Radial C. Backward curved D. Tangential
Last Answer : ANSWER : C
Description : In reciprocating compressors, one should aim at compressing the air A. Adiabatically B. Isentropically C. Isothermally D. Polytropically
Description : What is the device used in fiber optic communication which consist of a receiver transmitter use to clean up and amplify digital data moving in one direction and another in the opposite direction? A. Optic compressors B. Optic retarders C. Optic isolator D. Optic regenerators
Last Answer : D. Optic regenerators
Description : Which of the following produces maximum pressure difference for transportation of gases? (A) Vacuum pumps (B) Blowers (C) Fans (D) Compressors
Last Answer : (D) Compressors
Description : The maximum delivery pressure of compressors can be upto __________ atmospheres. (A) 10 (B) 100 (C) 250 (D) 1000
Last Answer : (D) 1000
Description : Centrifugal compressors compared to reciprocating compressors (A) Require less space (B) Have quieter operation (C) Have lower operating costs (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Multistage compressors are used in industry, because they (A) Reduce the cost of compressor (B) Reduce the size requirement (C) Resemble closely to isothermal compression (D) Are easy to control
Last Answer : (C) Resemble closely to isothermal compression
Description : High noise levels produced during operation of fans and compressors can be reduced by using (A) Mufflers (silencers) (B) Acoustic absorbent (C) Lagging of noisy duct (D) None of these
Last Answer : (A) Mufflers (silencers)
Description : How Centrifugal compressors work?
Last Answer : Answer: High-speed impellers increase the kinetic energy of the gas, converting this energy into higher pressures in a divergent outlet passage called a diffuser. Large volume of gas at moderate pressure.
Description : What are the types of compressors?
Last Answer : Answer: Positive Displacement, Centrifugal and Axial, rotary screw, rotary vane, rotary lobe, dynamic, liquid ring compressors.
Description : If Carrier develops a new air conditioning compressor that lasts twice as long as existing compressors but only uses half the electricity, it will probably establish its pricing based on: A)cash flow. B)product quality. C)survival. D)return on investment. E)market share.
Last Answer : B)product quality.
Description : What are the methods of capacity control in centrifugal air compressors?
Last Answer : Centrifugal compressors operate best at the design point. They are prone to surging at flow rates less than 50% of the rated capacity. The following types of controls are employed in ... variable speed drives to match compressor output to meet varying load requirements is by speed control
Description : What is the effect of increase in altitude on the performance of single stage reciprocating compressors?
Last Answer : With the increase in altitude, there will be reduction in air pressure, which results in increase in compression ratio, leading to higher discharge temperature and reduced efficiency.
Description : List the advantages of keeping the discharge pressure for reciprocating compressors at minimum.
Last Answer : Lower power consumption Less load on the piston rods and hence reduced maintenance costs Lower leakage losses
Description : List the means of capacity control for reciprocating compressors.
Last Answer : On/off control Load and unload control Multi-step control
Description : What are the likely effects of using very cold water in intercoolers for reciprocating compressors?
Last Answer : Use of very cold water can result in condensation which may result in water entering the cylinder, thereby reducing valve life, accelerating wear and scoring of piston, piston rings and ... and cause rust which will result in abrasion during compressor operation and significantly reduce efficiency.
Description : Why inter-coolers are required for multi-stage reciprocating compressors?
Last Answer : The intercoolers reduce the temperature of air/gas discharged between stages. Ideally, the intake temperature at each stage should be the same as that at the first stage (referred to a perfect cooling), so that the volume of air to be compressed does not increase and hence reduced power consumption.
Description : What is a surge point and how do you prevent surging, in centrifugal compressors?
Last Answer : Surge point is the point on the performance curve where a further decrease inflow (typically in the region of 50-70 % of rated capacity) causes instability, resulting in a pulsating flow, ... to thrust reversals, or excessive vibration. Bypass valves advents are commonly used to prevent surging.
Description : Give major classifications of compressors and the basic principle of its working.
Last Answer : The major classifications of compressors are positive displacement and dynamic type. Positive displacement can be further divided in to (a) Reciprocating (b) Rotary. Dynamic compressors divided into Radial and ... increase the air or gas velocity, which is then converted to increase the pressure.
Description : From base load operation and from achieving best specific energy consumption point of view, which of the following compressors are suitable? a) Single stage reciprocating compressors b) Centrifugal compressors c) Two stage reciprocating compressor d) Multi stage reciprocating compressor
Last Answer : b) Centrifugal compressors
Description : From the point of lower specific energy consumption, which of the following compressors are suitable for part load operation? a) Two stage reciprocating compressors b) Centrifugal compressors c) Two stage screw compressor d) Single stage screw compressor
Last Answer : a) Two stage reciprocating compressors
Description : Identify the correct statement for air compressors. a. For every 5.5oC drop in the inlet air temperature, the increase in energy consumption is by 2%. b. For every 4 oC rise in ... increase in energy consumption is by 1% d. The energy consumption remains same irrespective of inlet air temperature
Last Answer : c. For every 4 oC rise in the inter air temperature, the increase in energy consumption is by 1%
Description : Which of the statement is True for centrifugal compressors? a) The compressor should not be operated at full load b) The compressor should be operated at shut off pressure c) The ... operated with inlet-guide vane control d) The compressor should not be operated close to the surge point
Last Answer : d) The compressor should not be operated close to the surge point
Description : The compression ratios for axial flow compressors are ____. a) Lesser b) Higher c) moderate d) None
Last Answer : b) Higher
Description : Vertical type reciprocating compressors are used in the capacity range of _____ a) 50 – 150 cfm b) 200 – 500 cfm c) Above 10ooo cfm d) 10 – 50 cfm
Last Answer : a) 50 – 150 cfm
Description : Which of the following type does Screw compressor belongs to? a) Positive displacementcompressor b) Dynamic compressors c) Both a & b d) None of the above
Last Answer : a) Positive displacementcompressor
Description : How do screw compressors differ from reciprocating ones?
Last Answer : All air compressors are divided into two types: reciprocating and screw, and many enterprises are faced with the problem of choosing a compressor. This choice affects not only the efficiency of the ... for screw compressor equipment. Based on materials from the site http://compressor.dukon.ru/ .
Description : Where are portable screw compressors used?
Last Answer : Where are portable screw compressors used? The use of a portable screw air compressor in road, construction, mining and installation works indicates that its area of practical use is ... with these important, but fairly simple requirements will significantly lengthen the life of your compressor.
Description : Explain construction and working of two stage reciprocating air compressors.
Last Answer : Figure: Two Stage Reciprocating air compressor Construction and Working : It consists of two cylinders (L.P. and H.P.) with water cooled intercooler and air receiver. First of all fresh air is ... (ie second stage) from 3 to 4 is delivered by the compressor at pressure P3 & Temp T4.
Last Answer : The motor used for the compressors is capacitor-start capacitor-run motor.
Description : How much does it cost to install a vehicle tracking system and where can I get it done in Dallas, Texas?
Last Answer : It costs about $100 or $300 to install a vehicle tracking system. Also, you can get it done at www.dallasmobilec.com or even better, by yourself.
Description : How to Install New Wiper Blades on a Vehicle?
Last Answer : It's important to keep the wiper blades on a vehicle in good condition. Wiper blades can remove debris, improve visibility, and aid with snow removal during the winter. An older set of wiper blades ... to recycle old wiper blades. This can be a great way to help the environment while saving money.
Description : From the following which material handling equipment is used in Robot centered layout of FMS a.Industrial Robot b.Conveyor systems c.Rail guided vehicle system d.None of the above
Last Answer : a.Industrial Robot
Description : ____ is an independent and self-operated vehicle which moves on defined guide ways a.Automated Guarded Vehicles b.Automated Storage and Retrieval System c.Automated Guided Vehicles d.Automated Driving Vehicles
Last Answer : c.Automated Guided Vehicles
Description : A combination of equipment and controls which handles, stores and retrieves materials withprecision,accuracy and speed under a defined degree of automation is known as ____ a.Automated storage and retrieval system (AS/RS) b.Flexible manufacturing system c.Automated guided vehicle d.None of the above
Last Answer : a.Automated storage and retrieval system (AS/RS)
Description : From the following which method is used to guide the AGV. a.Wire guided b.Paint strip c.Self guided vehicle d.All of the above
Last Answer : d.All of the above
Description : From the following which is the types of Automated Guided Vehicle (AGV). a.Driver less train b.Pallet trucks c.Unit load carriers d.All of the above
Description : From the following what is the full form of AGV? a.Automatic Guided Vehicle b.Automated Gas Vehicle c.Automated Guided Vehicle d.None of the above
Last Answer : c.Automated Guided Vehicle
Description : From the following which is the main components of Flexible manufacturing system(FMS). a.Main frame computer b.Automated guided vehicle c.Material handling system d.All of the above
Description : The ideal angle of banking provided on roads a.Depends on (velocity)2 of vehicle b.Depends on the nature of road surface c.Depend on coefficient of friction between the road and the vehicle cantact point d.Depends on weight of the vehicle e.All above
Last Answer : a. Depends on (velocity)2 of vehicle
Description : A man weighing 60 kg jumps on a vehicle of weight 240 kg moving with a velocity of 36 km/hours. The velocity of the vehicle after the man has jumped would be a.Less than 3.6 km/hour b.3.6 km/hour c.More than 3.6 km/hour d.4.5 km/hour e.None of the above
Last Answer : a. Less than 3.6 km/hour
Description : tractor is a vehicle that runs on continuous tracks instead of wheels. In agriculture they are used for land clearing and land leveling works. a. Row crop b. Walking d. None of the above
Last Answer : <!-- [if !supportLists] -->a. <!-- [endif] -->Ans- c. crawler
Description : A tractor is an engineering vehicle specifically designed to deliver a high torque at speeds A. High C. Slow B. Extreme High D. Medium
Last Answer : Slow
Description : If My Work Space Is Dirty, How Can I Take Care To Install A New Bearing Without Messing It Up From The Git-go?
Last Answer : It's understandable, after you've taken the time and care to properly store your bearings, that you would want to be sure to install them in a clean environment. But, that's tricky. Clean ... early failure. And, remember bearings should not be washed, except for oil mist or circulating oil system.
Description : In which process, Purification of raw materials by removing foreign matter (a) Harvesting (c) Primary (b) Secondary (d) Tertiary
Last Answer : Primary