What are the different types of pressure regulators available for air compressor system?

What are the different types of pressure regulators available for air compressor system? 
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1 Answer

Answer :

Pilot operated type

 Direct acting type

 Self – relieving type 
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Explain about the air compressor modulation by optimal pressure settings.

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The percentage increase in power consumption of a compressor with suction side air filter and with the pressure drop across the filter of 200 mmWc is ____ a) 1.0% b) 3% c) 2.4% d) 1.6%

Description : The percentage increase in power consumption of a compressor with suction side air filter and with the pressure drop across the filter of 200 mmWc is ____ a) 1.0% b) 3% c) 2.4% d) 1.6% 

Last Answer : d) 1.6%

Can you explain how temperature of inlet air affects the energy consumption of an air compressor?

Description : Can you explain how temperature of inlet air affects the energy consumption of an air compressor?

Last Answer : As a thumb rule “for every 4 °C rise in inlet air temperature results in a higher energy consumption by 1% to achieve equivalent output”. Hence cool air intake leads to a more efficient compression.

If the compressor of 200 cfm loads in 10 seconds and unloads in 20 seconds, the air leakage would be_____ a) 67 cfm b) 100 cfm c) 10 cfm d) 133 cfm

Description : If the compressor of 200 cfm loads in 10 seconds and unloads in 20 seconds, the air leakage would be_____ a) 67 cfm b) 100 cfm c) 10 cfm d) 133 cfm 

Last Answer : a) 67 cfm

For every 4°C raise in air inlet temperature of an air compressor, the power consumption will increases by_____ a) 2% b) 1% c) 3% d) 4%

Description : For every 4°C raise in air inlet temperature of an air compressor, the power consumption will increases by_____ a) 2% b) 1% c) 3% d) 4%

Last Answer : b) 1%

The basic function of air dryer in a compressor is: a. prevent dust from entering compressor b. storage and smoothening pulsating air output c. reduce the temperature of the air before it enters the next state to increase efficiency d. to remove remaining traces of moisture after after-cooler

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Reduction in the delivery pressure of a Compressor working at 7 bar, by 1 bar would reduce the power consumption by a) 6 to 10 % b) 2 to 3 % c) 12 to 14 % d) None of the above

Description : Reduction in the delivery pressure of a Compressor working at 7 bar, by 1 bar would reduce the power consumption by a) 6 to 10 % b) 2 to 3 % c) 12 to 14 % d) None of the above

Last Answer : a) 6 to 10 %

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 compressor should not be operated with inlet-guide vane control d) The compressor should not be operated close to the surge point

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Briefly describe about ‘rotary compressor’?

Description : Briefly describe about ‘rotary compressor’?  

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Which of the following parameters are not required for evaluating volumetric efficiency of the compressor? a) Power b) Cylinder bore diameter c) Stroke length d) FAD

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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

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

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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

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The ratio of isothermal power to actual measured input power of a compressor is known as: a) Isothermal efficiency b) Volumetric Efficiency c) Barometric efficiency d) None

Description : The ratio of isothermal power to actual measured input power of a compressor is known as: a) Isothermal efficiency b) Volumetric Efficiency c) Barometric efficiency d) None 

Last Answer : a) Isothermal efficiency

The volumetric efficiency of the compressor ______ with the increase in altitude of place a) increases b) decreases c) does not change d) None

Description : The volumetric efficiency of the compressor ______ with the increase in altitude of place a) increases b) decreases c) does not change d) None

Last Answer : b) decreases

The discharge temperature of two stage compressor compared to single stage one is ____ a) Lesser b) Same c) Higher d) None

Description : The discharge temperature of two stage compressor compared to single stage one is ____ a) Lesser b) Same c) Higher d) None  

Last Answer : a) Lesser

The specific power consumption of non lubricated compressor compared to lubricated type is ____ a) Lesser b) Same c) Higher d) None

Description : The specific power consumption of non lubricated compressor compared to lubricated type is ____ a) Lesser b) Same c) Higher d) None 

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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

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 

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Explain about the importance of optimal Pressure settings of a compressed air network

Description : Explain about the importance of optimal Pressure settings of a compressed air network 

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The acceptable pressure drop at the farthest point in mains header of an industrial compressed air network is: a)0.3 bar b) 0.5 bar c) 1.0 bar d) 2 bar

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What are the most common types of compressed air dryers used?

Description : What are the most common types of compressed air dryers used? 

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List the components of a compressed air system.

Description : List the components of a compressed air system. 

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The likely estimate on equivalent power wastage for a leakage from 7 bar compressed air system through 1.6 mm orifice size is ____ a) 0.2 kW b) 3.0 kW c) 0.8 kW d) 12 kW

Description : The likely estimate on equivalent power wastage for a leakage from 7 bar compressed air system through 1.6 mm orifice size is ____ a) 0.2 kW b) 3.0 kW c) 0.8 kW d) 12 kW

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Air Conditioning/ Electrical

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Last Answer : C

Electricity or Air Conditioning

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What are the methods of capacity control in centrifugal air compressors?

Description : What are the methods of capacity control in centrifugal air compressors?  

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What is the function of an air receiver?

Description : What is the function of an air receiver?

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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 the inlet air temperature, the decrease in energy consumption is by 1% c. For every 4 oC rise in the inter air temperature, the increase in energy consumption is by 1% d. The energy consumption remains same irrespective of inlet air temperature

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 

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List the advantages of keeping the discharge pressure for reciprocating compressors at minimum.

Description : List the advantages of keeping the discharge pressure for reciprocating compressors at minimum. 

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What is the effect of increase in altitude on the performance of single stage reciprocating compressors?

Description : What is the effect of increase in altitude on the performance of single stage reciprocating compressors? 

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List the means of capacity control for reciprocating compressors.

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What are the likely effects of using very cold water in intercoolers for reciprocating compressors?

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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. 

Why inter-coolers are required for multi-stage reciprocating compressors?

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.

What is a surge point and how do you prevent surging, in centrifugal compressors?

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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. 

Give major classifications of compressors and the basic principle of its working.

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. 

The compression ratios for axial flow compressors are ____. a) Lesser b) Higher c) moderate d) None

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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

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

What are the different types of regulators used in LPG Stove?

Description : What are the different types of regulators used in LPG Stove?

Last Answer : Low pressure regulator is standard type and regulate up to 28mbar, the high pressure regulator handles up to 500mbar and it is adjustable. The choice of regulator will depend on the type ... and application, home use cylinder will definitely require the low pressure regulator for safety reasons.

Mention the types of growth regulators and give example.

Description : Mention the types of growth regulators and give example.

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The two basic types of voltage regulators are ___ and ___

Description : The two basic types of voltage regulators are ___ and ___

Last Answer : Series and shunt.

The two basic types of voltage regulators are _______ and _______.

Description : The two basic types of voltage regulators are _______ and _______.

Last Answer : Series and shunt.

In many types of cancer, proteins that are crucial regulators of the cell cycle are often mutated and cannot function correctly. This leads to the evasion of apoptosis and to the loss of control of cell proliferation? For example, many cancer cells carry two mutant copies of the gene that codes for a tumor suppressor protein named p53. What is the normal function of p53 that is lost when it is mutated?

Description : In many types of cancer, proteins that are crucial regulators of the cell cycle are often mutated and cannot function correctly. This leads to the evasion of apoptosis and to the loss of control of cell ... protein named p53. What is the normal function of p53 that is lost when it is mutated?

Last Answer : Normally, p53 senses DNA damage and acts as a transcription factor for checkpoint control genes.

A reciprocating compressor is not suitable for use as a supercharger because: A. it runs at lower rpm B. the pressure ratio is high C. volumetric efficiency is high D. it is bulky and can handle small quantity of air

Description : A reciprocating compressor is not suitable for use as a supercharger because: A. it runs at lower rpm B. the pressure ratio is high C. volumetric efficiency is high D. it is bulky and can handle small quantity of air

Last Answer : ANSWER : D

The volume of air delivered by the compressor is called A. Free air delivery B. Compressor capacity C. Swept volume D. Mean effective pressure

Description : The volume of air delivered by the compressor is called A. Free air delivery B. Compressor capacity C. Swept volume D. Mean effective pressure

Last Answer : ANSWER : B

The maximum delivery pressure in a rotary air compressor is A. 10 bar B. 20 bar C. 30 bar D. 50 bar

Description : The maximum delivery pressure in a rotary air compressor is A. 10 bar B. 20 bar C. 30 bar D. 50 bar

Last Answer : ANSWER : A

In a two stage reciprocating air compressor with a suction pressure of 2 bar and delivery pressure of 8 bar the ideal intercooler pressure will be A. 10 bar B. 6 bar C. 4 bar D. 3 bar

Description : In a two stage reciprocating air compressor with a suction pressure of 2 bar and delivery pressure of 8 bar the ideal intercooler pressure will be A. 10 bar B. 6 bar C. 4 bar D. 3 bar

Last Answer : ANSWER : C

In a single stage reciprocating air compressor, the work done on air to compressor is from suction pressure to delivery pressure will be minimum when the compression is A. Isothermal process B. Adiabatic process C. Polytropic process D. Constant pressure process.

Description : In a single stage reciprocating air compressor, the work done on air to compressor is from suction pressure to delivery pressure will be minimum when the compression is A. Isothermal process B. Adiabatic process C. Polytropic process D. Constant pressure process.

Last Answer : ANSWER : A

Which one of the following statement is not correct for the volumetric efficiency of a reciprocating air compressor? A. It decreases with increase in ambient temperature B. It increases with decrease in pressure ratio C. It increases with decrease in clearance ratio D. It decreases with increases in delivery pressure

Description : Which one of the following statement is not correct for the volumetric efficiency of a reciprocating air compressor? A. It decreases with increase in ambient temperature B. It increases with ... It increases with decrease in clearance ratio D. It decreases with increases in delivery pressure

Last Answer : ANSWER : A