For obtaining high COP, the pressure range of compressor should be q. a) High. c) Optimum b) Low. d) Any value

For obtaining high COP, the pressure range of compressor should be q. a) High. c) Optimum b) Low. d) Any value
by

1 Answer

Answer :

LOW
by

Related questions

For obtaining high COP, the pressure range of compressor should be (a) high (b) low (c) optimum (d) any value

Description : For obtaining high COP, the pressure range of compressor should be (a) high (b) low (c) optimum (d) any value

Last Answer : Ans: b

For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be (a) small (b) high (c) equal (d) anything

Description : For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be (a) small (b) high (c) equal (d) anything

Last Answer : Ans: a

Full form of COP is A. Coefficient of Pressure B. Coefficient of performance C. Coefficient of program D. None of the above

Description : Full form of COP is A. Coefficient of Pressure B. Coefficient of performance C. Coefficient of program D. None of the above

Last Answer : Coefficient of performance

The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet. (A) P, Q and R (B) P and R (C) R and S (D) P, Rand S

Description : The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet. (A) P, Q and R (B) P and R (C) R and S (D) P, Rand S

Last Answer : (A) P, Q and R

What is the use of flash chamber in a vapour compression refrigeration cycle to improve the COP of refrigeration cycle ?

Description : What is the use of flash chamber in a vapour compression refrigeration cycle to improve the COP of refrigeration cycle ?

Last Answer : When liquid refrigerant as obtained from condenser is throttled, there are some vapours. These vapours if carried through the evaporator will not contribute to refrigerating effect. Using a flash ... out in stages. Similarly compression process is also done in two separate compressor stages.

What is the relationship between COP of heating and cooling ?

Description : What is the relationship between COP of heating and cooling ?

Last Answer : COP of heating is one(unity) more than COP of cooling.

The coefficient of performance (COP) is the ratio between the:  A. Power consumption in watts and heat absorbed per hour  B. Heat absorbed per hour and the power consumption in watts  C. Work required and the absorbed heat  D. Absorbed heat and work required

Description : The coefficient of performance (COP) is the ratio between the:  A. Power consumption in watts and heat absorbed per hour  B. Heat absorbed per hour and the power consumption in watts  C. Work required and the absorbed heat  D. Absorbed heat and work required

Last Answer : Absorbed heat and work required

Which one is the correct relation between energy efficiency ratio (EER) and coefficient of performance (COP)?  A. EER = 2.34 COP  B. EER = 3.24 COP  C. EER = 3.42 COP  D. EER = 4.23 COP

Description : Which one is the correct relation between energy efficiency ratio (EER) and coefficient of performance (COP)?  A. EER = 2.34 COP  B. EER = 3.24 COP  C. EER = 3.42 COP  D. EER = 4.23 COP

Last Answer : EER = 3.42 COP

Why the work per kg of air flow in axial flow compressor is less compared to centrifugal compressor for same pressure ratio ?

Description : Why the work per kg of air flow in axial flow compressor is less compared to centrifugal compressor for same pressure ratio ?

Last Answer : Isentropic efficiency of axial flow compressor is higher.

Is It Possible To Use An Adjustable Pressure Switch With My Compressor?

Description : Is It Possible To Use An Adjustable Pressure Switch With My Compressor?

Last Answer : May not use adjustable pressure switches with any VIAIR compressor. If you use an adjustable pressure switch, you can set the pressure switch higher than the maximum pressure that is rated for your ... supply tank. Doing so will immediately void your warranty, not to mention, it is dangerous.

Is It Possible To Hook Up More Than One Compressor To A Single Pressure Switch?

Description : Is It Possible To Hook Up More Than One Compressor To A Single Pressure Switch?

Last Answer : Yes, it is possible to use one pressure switch on more than one compressor. You should always run a relay if you want to hook up multiple compressors to a single switch. You should check the amp draw on the switch first, and then you’ll know how many compressors you can hook up to one switch.

Minimum work in compressor is possible when the value of adiabatic index n is equal to  (a) 0.75  (b) 1  (c) 1.27  (d) 1.35  (e) 2.

Description : Minimum work in compressor is possible when the value of adiabatic index n is equal to  (a) 0.75  (b) 1  (c) 1.27  (d) 1.35  (e) 2.

Last Answer : Answer : b

Pick up the correct statement from the following: (A) A maximum value of dry density is obtained at optimum water content (B) At low value of water content most soils tend to be stiff (C) At high water content, the dry density decreases with an increase of water content (D) All the above

Description : Pick up the correct statement from the following: (A) A maximum value of dry density is obtained at optimum water content (B) At low value of water content most soils tend to be stiff (C) At high water content, the dry density decreases with an increase of water content (D) All the above

Last Answer : Answer: Option D

Engineering news formula for obtaining safe bearing capacity of pile for drop hammer, is, (A) Q = Wh/6 (S + 2.5) (B) Q = Wh/2.5 (S + 6) (C) Q = (W × 6)/h (S + 2.5) (D) Q = (W × 2.5)/6 (S + h)

Description : Engineering news formula for obtaining safe bearing capacity of pile for drop hammer, is, (A) Q = Wh/6 (S + 2.5) (B) Q = Wh/2.5 (S + 6) (C) Q = (W × 6)/h (S + 2.5) (D) Q = (W × 2.5)/6 (S + h)

Last Answer : Answer: Option A

In vapour compression cycle using NH3 as refrigerant, initial charge is filled at (a) suction of compressor (b) delivery of compressor (c) high pressure side close to receiver (d) low pressure side near receiver

Description : In vapour compression cycle using NH3 as refrigerant, initial charge is filled at (a) suction of compressor (b) delivery of compressor (c) high pressure side close to receiver (d) low pressure side near receiver

Last Answer : Ans: c

For a two stage compressor, the ratio of diameter of low pressure cylinder to high pressure cylinder is equal to A. Square of the ratio of final pressure to initial pressure B. The ratio of final pressure to initial pressure C. The square root of the ratio of final pressure to initial pressure D. Cube root of the ratio of final pressure to initial pressure

Description : For a two stage compressor, the ratio of diameter of low pressure cylinder to high pressure cylinder is equal to A. Square of the ratio of final pressure to initial pressure B. The ratio of ... final pressure to initial pressure D. Cube root of the ratio of final pressure to initial pressure

Last Answer : ANSWER : C

For very low pressure and high discharge rate, the compressor used is a/an __________ compressor. (A) Axial (B) Reciprocating (C) Rotary (D) None of these

Description : For very low pressure and high discharge rate, the compressor used is a/an __________ compressor. (A) Axial (B) Reciprocating (C) Rotary (D) None of these

Last Answer : (C) Rotary

In part programming, interpolation is used for obtaining trajectory. a.helicoidal b.pentagonal c.triangular d.zig-zag

Description : In part programming, interpolation is used for obtaining trajectory. a.helicoidal b.pentagonal c.triangular d.zig-zag

Last Answer : a.helicoidal

The applications of S&L scheme are _____. a) Procedure for obtaining a label b) Financial obligations involved c) Frost free refrigerator d) Model registration

Description : The applications of S&L scheme are _____. a) Procedure for obtaining a label b) Financial obligations involved c) Frost free refrigerator d) Model registration

Last Answer : Model registration

A perfect gas has a value of R= 319.2 J/ kf.K and k= 1.26. If 120 kJ are added to 2.27 kf\g of this gas at constant pressure when the initial temp is 32.2°C? Find T2.  a. 339.4 K  b. 449.4 K  c. 559.4K  d. 669.4K formula: cp = kR/ k-1 Q= mcp(T2-T1)

Description : A perfect gas has a value of R= 319.2 J/ kf.K and k= 1.26. If 120 kJ are added to 2.27 kf\g of this gas at constant pressure when the initial temp is 32.2°C? Find T2.  a. 339.4 K  b. 449.4 K  c. 559.4K  d. 669.4K formula: cp = kR/ k-1 Q= mcp(T2-T1)

Last Answer : 339.4 K

Why Compressor Shuts Down On High-temperature?

Description : Why Compressor Shuts Down On High-temperature?

Last Answer : If your compressor trips on over temeprature, it could be any of the following:  Ambient temperature too high or not enough ventilation.  Too low oil level.  Wrong type of oil.  Dirty oil cooler.  Thermostatic valve not working.  Dirt / obstruction in oil lines.

Which of the following statements is true with regard to the relationship among audit risk, audit evidence, and materiality? a. The lower the inherent risk and control risk, the lower the aggregate materiality threshold. b. Under conditions of high inherent and control risk, the auditor should place more emphasis on obtaining external evidence and should reduce reliance on internal evidence. c. Where inherent risk is high and control risk is low, the auditor may safely ignore inherent risk. d. Aggregate materiality thresholds should not change under conditions of changing risk levels

Description : Which of the following statements is true with regard to the relationship among audit risk, audit evidence, and materiality? a. The lower the inherent risk and control risk, the lower ... inherent risk. d. Aggregate materiality thresholds should not change under conditions of changing risk levels

Last Answer : Under conditions of high inherent and control risk, the auditor should place more emphasis on obtaining external evidence and should reduce reliance on internal evidence

Optimum engine temp is about how many degree 1. 60 2. 82 3. 100 4. 120

Description : Optimum engine temp is about how many degree 1. 60 2. 82 3. 100 4. 120

Last Answer : ans 2

Post harvest Technology optimum in (a) Losses in handling (c) Cost reduction (b) Losses in packaging (d) All

Description : Post harvest Technology optimum in (a) Losses in handling (c) Cost reduction (b) Losses in packaging (d) All

Last Answer : All

In disc harrow, the penetration of disc improves by: a) Increasing disc angle c) Lowering hitch point b) Regulating optimum speed d) All are correct

Description : In disc harrow, the penetration of disc improves by: a) Increasing disc angle c) Lowering hitch point b) Regulating optimum speed d) All are correct

Last Answer : Increasing disc angle 

is the Objective of the energy management from the following :- a) To give each product a label b) To evolve minimum energy consumption c) To minimize environmental effects d) To achieve optimum energy procurement

Description : is the Objective of the energy management from the following :- a) To give each product a label b) To evolve minimum energy consumption c) To minimize environmental effects d) To achieve optimum energy procurement

Last Answer :  To evolve minimum energy consumption 

The objective of energy management is ____ A. To achieve and maintain optimum energy procurement and utilization throughout the organization B. To minimize the energy cost without affecting production and quality C. To minimize the environmental effects D. All of the above

Description : The objective of energy management is ____ A. To achieve and maintain optimum energy procurement and utilization throughout the organization B. To minimize the energy cost without affecting production and quality C. To minimize the environmental effects D. All of the above

Last Answer : All of the above

The optimum temperature range for sowing of wheat crop

Description : The optimum temperature range for sowing of wheat crop

Last Answer : Ans.20 to 25°C

The optimum range of available soil moisture for convenient and effective ploughing

Description : The optimum range of available soil moisture for convenient and effective ploughing

Last Answer : Ans.50-75%

When the circuit shown in the illustration is operating correctly, the voltage at the reference electrode will be kept in the optimum range of ____________. EL-0090 A. 0.01 - 0.05 volt B. 0.80 - 0.85 volt C. 35 - 60 volts D. 100 - 115 volts

Description : When the circuit shown in the illustration is operating correctly, the voltage at the reference electrode will be kept in the optimum range of ____________. EL-0090 A. 0.01 - 0.05 volt B. 0.80 - 0.85 volt C. 35 - 60 volts D. 100 - 115 volts

Last Answer : Answer: B

What is the optimum pH range for the cultivation of onion? a. 3.2-4.0 b. 5.8-6.5 c. 4.2-5.0 d. 8.9-10.6

Description : What is the optimum pH range for the cultivation of onion? a. 3.2-4.0 b. 5.8-6.5 c. 4.2-5.0 d. 8.9-10.6

Last Answer : b. 5.8-6.5

What is the optimum pH range for the cultivation of onion? a. 3.2-4.0 b. 5.8-6.5 c. 4.2-5.0 d. 8.9-10.6

Description : What is the optimum pH range for the cultivation of onion? a. 3.2-4.0 b. 5.8-6.5 c. 4.2-5.0 d. 8.9-10.6

Last Answer : b. 5.8-6.5

Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C. (A) -5 to 0 (B) 5 to 10 (C) 30 to 50 (D) 75 to 80

Description : Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C. (A) -5 to 0 (B) 5 to 10 (C) 30 to 50 (D) 75 to 80

Last Answer : (C) 30 to 50

How the net work to drive a compressor and its volumetric efficiency behave with increase in clearance volume ?

Description : How the net work to drive a compressor and its volumetric efficiency behave with increase in clearance volume ?

Last Answer : Work remains unaltered and volumetric efficiency decreases.

Why axial flow compressor is preferred for gas turbines for aeroplanes ?

Description : Why axial flow compressor is preferred for gas turbines for aeroplanes ?

Last Answer : Because it has low frontal area.

Why gas turbine power plant needs efficient compressor ?

Description : Why gas turbine power plant needs efficient compressor ?

Last Answer : Because a large portion of turbine work is eaten away by compressor and its inefficiency will affect net power output and cost of generation.

Under what condition the work done in reciprocating compressor will be least ?

Description : Under what condition the work done in reciprocating compressor will be least ?

Last Answer : It is least when compression process approaches isothermal. For this purpose, attempts are made to cool the air during compression.

Which is an example of closed system? (A) Air compressor (B) Liquid cooling system of an automobile (C) Boiler (D) None of these

Description : Which is an example of closed system? (A) Air compressor (B) Liquid cooling system of an automobile (C) Boiler (D) None of these

Last Answer : (B) Liquid cooling system of an automobile

What Is The Use Of Compressor In Refrigeration?

Description : What Is The Use Of Compressor In Refrigeration?

Last Answer : The compressor does exactly as its name says: it compresses the refrigerant. The compressor receives low pressure gas from the evaporator and converts it to high pressure gas. As mentioned earlier, as the gas is compressed, the temperature rises. The hot refrigerant gas then flows to the condenser.

What Is A Gas Compressor Used For?

Description : What Is A Gas Compressor Used For?

Last Answer : A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe.

What Is A Rotary Air Compressor?

Description : What Is A Rotary Air Compressor?

Last Answer : A rotary-screw compressor is a type of gas compressor that uses a rotary-type positivedisplacement mechanism. They are commonly used to replace piston compressors where large volumes of high- ... either for large industrial applications or to operate high-power air tools such as jackhammers.

How Does A Refrigerant Compressor Work?

Description : How Does A Refrigerant Compressor Work?

Last Answer :  The compressor constricts the refrigerant vapor, raising its pressure, and pushes it into the coils on the outside of the refrigerator.  When the hot gas in the coils meets the cooler air ... it becomes a liquid.  The refrigerant absorbs the heat inside the fridge, cooling down the air.

Why Is A Compressor Used In Refrigeration?

Description : Why Is A Compressor Used In Refrigeration?

Last Answer : The compressor does exactly as its name says: it compresses the refrigerant. The compressor receives low pressure gas from the evaporator and converts it to high pressure gas. As mentioned earlier, as the gas is compressed, the temperature rises. The hot refrigerant gas then flows to the condenser.

Why Doesn't My Air Compressor Produce As Much Air As It Used To?

Description : Why Doesn't My Air Compressor Produce As Much Air As It Used To?

Last Answer : The most common cause is bad valves. It is also important to check your entire system for higher air consumption or leaks.

Why Does The Safety Valve On My Compressor Pump Make A "popping" Sound?

Description : Why Does The Safety Valve On My Compressor Pump Make A "popping" Sound?

Last Answer : This is most commonly an indication of bad valves. Depending on the model valves could be rebuilt or replaced.

Why Does My Compressor Leak Air When The Compressor Shuts Off?

Description : Why Does My Compressor Leak Air When The Compressor Shuts Off?

Last Answer : Most air compressors have a one way check valve between the compressor pump and the air receiver. When the compressor shuts off the check valve prevents the high pressure air from traveling back ... more common types are pressure switch mounted or centrifugal mounted on the end of the crankshaft.

Will My Small Homeowner Air Compressor Be Able To Handle An Extra Tank?

Description : Will My Small Homeowner Air Compressor Be Able To Handle An Extra Tank?

Last Answer : It depends on whether or not you have a continuous duty air compressor or not. A continuous duty compressor means that it is able to run for long periods of time (aka continuously). This type of ... that you give it time to cool off when filling the tank, otherwise you would be going overboard.

What Is The Difference Between A Rotary Screw Compressor And A Reciprocating Compressors?

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.

How Often Until A New Compressor Is 'broken In'?

Description : How Often Until A New Compressor Is 'broken In'?

Last Answer : Air Compressors do not need to be broken in. Check for any leaks or malfunctions during the first start-up, but after that you should be ready to go.

How Much Air Will I Need To Power My Air Compressor Tool?

Description : How Much Air Will I Need To Power My Air Compressor Tool?

Last Answer : Generally, most air tools will take around 70-100 PSI, and will consume less than 10 CFM, however consult the manual or manufacturer of your tool for exact air requirements.