Define the performance coefficient of a refrigerator. ?

Define the performance coefficient of a refrigerator. ?
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1 Answer

Answer :

: The ratio of heat removed from low temperature heat to work performed by an outside company is called the performance coefficient of the refrigerator.
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The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are (A) (COP)R = (COP)HP = 0.6 (B) (COP)R = 2.5; (COP)HP = 1.5 (C) (COP)R = 1.5; (COP)HP = 2.5 (D) (COP)R = (COP)HP = 2.5

Description : The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a ... )R = 1.5; (COP)HP = 2.5 (D) (COP)R = (COP)HP = 2.5

Last Answer : (C) (COP)R = 1.5; (COP)HP = 2.5

Define coefficient of performance.

Description : Define coefficient of performance.

Last Answer : Coefficient of Performance.: Working performance of any machine is usually expressed by output/input ratio known as efficiency. In refrigeration it is denoted by C.O.P. ( β ) . COP= refrigeration effect/ work input to produced R.E.  β=RE/W

Co-efficient of Performance (COP) of a refrigerator is the ratio of the (A) Work required to refrigeration obtained (B) Refrigeration obtained to the work required (C) Lower to higher temperature (D) Higher to lower temperature

Description : Co-efficient of Performance (COP) of a refrigerator is the ratio of the (A) Work required to refrigeration obtained (B) Refrigeration obtained to the work required (C) Lower to higher temperature (D) Higher to lower temperature

Last Answer : (B) Refrigeration obtained to the work required

The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is (A) Less (B) More (C) Same (D) Dependent on climatic conditions

Description : The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is (A) Less (B) More (C) Same (D) Dependent on climatic conditions

Last Answer : (A) Less

Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is (A) 3 (B) 5 (C) 0.5 (D) 1.5

Description : Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is (A) 3 (B) 5 (C) 0.5 (D) 1.5

Last Answer : Option A

The coefficient of performance is the ratio of the refrigerant effect to the (a) heat of compression (b) work done by compressor (c) enthalpy increase in compressor (d) all of the above

Description : The coefficient of performance is the ratio of the refrigerant effect to the (a) heat of compression (b) work done by compressor (c) enthalpy increase in compressor (d) all of the above

Last Answer : Ans: d

A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. TheCarnot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6

Description : A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. TheCarnot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6

Last Answer : Ans: c

The relative coefficient of performance is (a) actual COP/theoretical COP (b) theoretical COP/actual COP (c) actual COP x theoretical COP (d) 1-actual COP x theoretical COP

Description : The relative coefficient of performance is (a) actual COP/theoretical COP (b) theoretical COP/actual COP (c) actual COP x theoretical COP (d) 1-actual COP x theoretical COP

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 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

What refers to the amount of heat removed from the cooled space in BTS’s for 1 watt-hour of electricity consumed?  A. Cost efficiency rating  B. Energy efficiency rating  C. Coefficient of performance  D. Cost of performance

Description : What refers to the amount of heat removed from the cooled space in BTS’s for 1 watt-hour of electricity consumed?  A. Cost efficiency rating  B. Energy efficiency rating  C. Coefficient of performance  D. Cost of performance

Last Answer : Energy efficiency rating

When V-belt drive is used a safety device, its performance is affected by a) Variation in belt tention b) Increase in coefficient of friction as belt slippage increase c) Both (a) and (b) d) None of the above

Description : When V-belt drive is used a safety device, its performance is affected by a) Variation in belt tention b) Increase in coefficient of friction as belt slippage increase c) Both (a) and (b) d) None of the above

Last Answer : c) Both (a) and (b)

What is a refrigerator ?

Description : What is a refrigerator ?

Last Answer : answer:

In a refrigerator, by which is cooling is produced?

Description : In a refrigerator, by which is cooling is produced?

Last Answer : – By the evaporation of a volatile liquid

In a refrigerator what produces the cooling? (1) The ice which deposits on the freezer (2) The sudden expansion of a compressed gas (3) The evaporation of a volatile liquid (4) None of these

Description : In a refrigerator what produces the cooling? (1) The ice which deposits on the freezer (2) The sudden expansion of a compressed gas (3) The evaporation of a volatile liquid (4) None of these

Last Answer : (4) None of these Explanation: Basically, refrigeration system consists of devices that compress and expand refrigerant gas. When refrigerant gas is compressed it expels heat and when it is suddenly ... inside of the fridge is cooled to a temperature below the ambient temperature of the room.

The gas used in a refrigerator is - (1) cooled down on flowing (2) heated up on flowing (3) cooled down when compressed (4) cooled down when expanded

Description : The gas used in a refrigerator is - (1) cooled down on flowing (2) heated up on flowing (3) cooled down when compressed (4) cooled down when expanded

Last Answer : (4) cooled down when expanded Explanation: Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.

In a refrigerator, the cooling system should always be – (1) at the top (2) at the bottom (3) at the middle (4) can be anywhere

Description : In a refrigerator, the cooling system should always be – (1) at the top (2) at the bottom (3) at the middle (4) can be anywhere

Last Answer : (2) at the bottom Explanation: The compressor is the motor (or engine) of the cooling system. It is normally at the bottom of the refrigerator in the back. The compressor runs whenever the refrigerator thermostat calls for cooling.

It is a very hot day. You are in a special kitchen, in that there are no exits and the walls of this kitchen are thermally very well insulated. If you open the refrigerator door, the room will eventually: w) cool off. x) remain the same. y) heat up.

Description : It is a very hot day. You are in a special kitchen, in that there are no exits and the walls of this kitchen are thermally very well insulated. If you open the refrigerator door, the room will eventually: w) cool off. x) remain the same. y) heat up.

Last Answer : ANSWER: Y -- HEAT UP.

In a refrigerator, the cooling system should always be (1) at the top (2) at the bottom (3) at the middle (4) can be anywhere

Description : In a refrigerator, the cooling system should always be (1) at the top (2) at the bottom (3) at the middle (4) can be anywhere

Last Answer : at the bottom

In a refrigerator what produces the cooling ? (1) The ice which deposits on the freezer (2) The sudden expansion of a compressed gas (3) The evaporation of a volatile liquid (4) None of these

Description : In a refrigerator what produces the cooling ? (1) The ice which deposits on the freezer (2) The sudden expansion of a compressed gas (3) The evaporation of a volatile liquid (4) None of these

Last Answer : None of these

A refrigerator is working on reversed carnot cycle between temperature of 30°C to –10°C with capacity of 10 tonnes. Calculate. (i) The COP (ii) Define ton of refrigeration (iii) Give the industrial application of refrigeration

Description : A refrigerator is working on reversed carnot cycle between temperature of 30°C to –10°C with capacity of 10 tonnes. Calculate. (i) The COP (ii) Define ton of refrigeration (iii) Give the industrial application of refrigeration

Last Answer : (ii) Ton of refrigeration: It is defined as the quantity of heat required to be removed from 1Ton water at 0oC to get ice at 0oC in one day. (iii) Industrial applications of refrigeration ... food stuff such as meat, fruit, fruit juice, vegetables etc. 5. Ice cooling of concrete for dam.

Does anyone know the coefficient of friction for an A rated tire?

Description : Does anyone know the coefficient of friction for an A rated tire?

Last Answer : answer:I can't give you an exact number on that, but I the A traction grade is the second-highest rating given to a tire, AA being the highest. The traction grade applies to wet ... 'd see on a skidpad test. There, you have sidewall construction and vehicle characteristics to consider as well.

How to determine Axial Force Coefficient in Ansys Fluent ? -Physics

Description : How to determine Axial Force Coefficient in Ansys Fluent ? -Physics

Last Answer : I want to determine the aerodynamic coefficients of a 2D model (solid boosters). To be clear with the model, It is a 2D axisymmetric model, with blunt nose and flared aft body. There is a ... jet pressure ratio. Am I missing something or is there any other method to find axial force coefficient.

What is the level of expansion coefficient ?

Description : What is the level of expansion coefficient ?

Last Answer : The levels of expansion coefficient are alpha , beta and gamma.

What is heat transfer coefficient ?

Description : What is heat transfer coefficient ?

Last Answer : The method by which the molecules of a substance do not change their own position but simply give a molecule heat to its adjacent molecule by vibration and transfer heat from the warmer part to the cooler part of the substance is called heat transfer coefficient.

What is the unit of expansion coefficient ?

Last Answer : The unit of expansion coefficient is K ^ -1 .

What is elastic coefficient ?

Last Answer : The ratio of stress to distortion is called elastic coefficient.

What is the unit of elastic coefficient ?

Last Answer : The unit of elastic coefficient is Nm ^ -2 .

When hot liquid is poured into a thick glass tumbler, it cracks because glass – (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Description : When hot liquid is poured into a thick glass tumbler, it cracks because glass – (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Last Answer : (1) is a bad conductor of heat so only inner surface expands Explanation: When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.

When a ring of metal is heated what happens to its hole? (1) expands (2) contracts (3) it expands or contracts according to its diameter (4) it expands or contracts according to its coefficient of expansion

Description : When a ring of metal is heated what happens to its hole? (1) expands (2) contracts (3) it expands or contracts according to its diameter (4) it expands or contracts according to its coefficient of expansion

Last Answer : (1) expands Explanation: The hole size will increase because in expansion the size between two molecules, do not increase so when the molecules on the outer edge move outward. Due to expansion, the ... expansion is the tendency of matter to change in volume in response to a change in temperature.

Gas thermometers are more sensitive than the liquid thermometers because the gases – (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high specific heat

Description : Gas thermometers are more sensitive than the liquid thermometers because the gases – (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high specific heat

Last Answer : (1) have large coefficient of expansion Explanation: Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the has thermometer is more sensitive than liquid (mercury) thereto-meter.

Gas thermometers are more sensitive than the liquid thermometers because of the gases - (1) have low specific heat (2) have high specific heat (3) have large coefficient of expansion (4) are lighter

Description : Gas thermometers are more sensitive than the liquid thermometers because of the gases - (1) have low specific heat (2) have high specific heat (3) have large coefficient of expansion (4) are lighter

Last Answer : (1) have low specific heat Explanation: Gas thermometers are more sensitive because gas has low specific heat than liquids.

When temperature rises, resistance of negative temperature coefficient thermistor A. increases B. decreases C. zero D. infinity

Description : When temperature rises, resistance of negative temperature coefficient thermistor A. increases B. decreases C. zero D. infinity

Last Answer : decreases

Incorrect statement for co-efficient of friction could be that A. The coefficient of friction is denoted by the Greek letter µ. B. The coefficient of friction is directly proportional to the force of friction C. The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure D. The coefficient of friction is inversely proportional to the force pressing the surfaces together

Description : Incorrect statement for co-efficient of friction could be that A. The coefficient of friction is denoted by the Greek letter µ. B. The coefficient of friction is directly proportional to ... D. The coefficient of friction is inversely proportional to the force pressing the surfaces together

Last Answer : The coefficient of friction is constant even in the conditions of fast slipping and high contact pressure

Ice skating is possible and practical because of a unique property of water. Is it because: w) The coefficient of kinetic friction of steel on frozen water decreases with decreasing temperature x) Ice readily sublimes y) The melting point decreases with increasing pressure z) Ice is a good thermal insulator

Description : Ice skating is possible and practical because of a unique property of water. Is it because: w) The coefficient of kinetic friction of steel on frozen water decreases with decreasing temperature x ... sublimes y) The melting point decreases with increasing pressure z) Ice is a good thermal insulator 

Last Answer : ANSWER: Y -- THE MELTING POINT DECREASES WITH INCREASING PRESSURE 

Gas thermometers are more sensitive than the liquid thermometers because the gases (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high,specific heat

Description : Gas thermometers are more sensitive than the liquid thermometers because the gases (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high,specific heat

Last Answer : have large coefficient of expansion

When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Description : When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Last Answer :  is a bad conductor of heat so only inner surface expands 

When a ring of metal is heated what happens to its hole ? (1) expands (2) contracts (3) it expands or contracts according to its diameter (4) it expands or contracts according to its coefficient of expansion

Description : When a ring of metal is heated what happens to its hole ? (1) expands (2) contracts (3) it expands or contracts according to its diameter (4) it expands or contracts according to its coefficient of expansion

Last Answer : expands

What is friction? Define coefficient of static friction and coefficient of kinetic friction.

Description : What is friction? Define coefficient of static friction and coefficient of kinetic friction.

Last Answer : What is friction? Define coefficient of static friction and coefficient of kinetic friction. Give the necessary formula for each.

Define coefficient of restitution and obtain its value for an elastic collision and a perfectly inelastic collision.

Description : Define coefficient of restitution and obtain its value for an elastic collision and a perfectly inelastic collision.

Last Answer : Define coefficient of restitution and obtain its value for an elastic collision and a perfectly inelastic collision.

Define the term negative temperature coefficient.

Description : Define the term negative temperature coefficient.

Last Answer : It is the decrease in a semiconductor’s resistance as temperature rises.

Define the temperature coefficient of resistance.

Description : Define the temperature coefficient of resistance.

Last Answer : The amount of increase in the resistance of a 1-ohm sample of the conductor per degree of temperature rise above 0º C

Define permeability and coefficient of permeability

Description : Define permeability and coefficient of permeability 

Last Answer : Definition i) Permeability (k) It is defined as the properly of soli which permits the seepage of fluid through interconnecting voids under gravity OR Permeability (k) It is defined as the speed at which ... is represented as K = v/i  Where v = discharge velocity in m/s i = hydraulic gradient

Define coefficient of uniformity and coefficient of curvature. Calculate Cu and Cc if D10 = 0.90 mm, D30 = 1.18 mm, D60 = 2.30 mm.

Description : Define coefficient of uniformity and coefficient of curvature. Calculate Cu and Cc if D10 = 0.90 mm, D30 = 1.18 mm, D60 = 2.30 mm.

Last Answer : Coefficient of uniformity: It is the ratio of D60 to D10 values of soil from particle size distribution curve, called as coefficient of uniformity. Coefficient of curvature: It is the ratio of square of D30 to product of D10 and D60 values of coefficient of curvature.

State the Darcy’s law of permeability with expression. Hence define coefficient of permeability.

Description : State the Darcy’s law of permeability with expression. Hence define coefficient of permeability.

Last Answer : Darcy's law of permeability: It states that for laminar flow, the rate of flow or discharge per unit time is directly proportional to hydraulic gradient. Expression: q = KiA  / = Ki  V = Ki ... velocity of flow under a unit hydraulic gradient through a soil. Mathematically: K = V/i

Define film heat transfer coefficient.

Description : Define film heat transfer coefficient.

Last Answer : Film heat transfer coefficient: Film heat transfer coefficient h is defined as the quantity of heat transferred in unit time through unit area at a temperature difference of 10 between the surface and surrounding.

Define coefficient of fluctuation of energy.

Description : Define coefficient of fluctuation of energy. 

Last Answer : Definition of Coefficient of Fluctuation of Energy: It may be defined as the ratio of the maximum fluctuation of energy to the work done per cycle. Mathematically it is expressed as; 

Define :i) Self inductance ii) Coefficient of self induction

Description : Define :i) Self inductance ii) Coefficient of self induction

Last Answer : i) Self-inductance: It is the property by virtue of which a coil opposes change in current flowing through it by inducing an emf in it such that its effect is to circulate current (induced current) that produces a magnetic field ...          N = di/dt        N = Φ/I  It is expressed in henry.  

When a vehicle passes, TV reception gets distorted. This is because – (1) metal reflects radiowaves (2) spark plug creates electromagnetic disturbances (3) vehicle pollution affects the performance of the TV components (4) modern vehicles use electro ignition system

Description : When a vehicle passes, TV reception gets distorted. This is because – (1) metal reflects radiowaves (2) spark plug creates electromagnetic disturbances (3) vehicle pollution affects the performance of the TV components (4) modern vehicles use electro ignition system

Last Answer : (2) spark plug creates electromagnetic disturbances Explanation: This is caused due to the interference caused by the electromagnetic waves generated by a passing vehicle. These waves were within the same ... in which two waves superimpose to form a resultant wave of greater or lower amplitude.