For a refrigerating system that works on reversed Carnot cycle having vapor as refrigerant, which one of the following is not a process of the cycle in p-v diagram?

For a refrigerating system that works on Carnot cycle having air or gas as refrigerant s, which one of the following is not a process of the cycle in p-v diagram?

A

Adiabatic compression process

B

Isothermal compression process

C

Adiabatic expansion process

D

Isentropic expansion process

Seven people A, B, C, D, E, F and G live on separate floors of a 7-floor building. Ground floor is numbered 1, first floor is numbered. 2 and so on until the topmost floor is numbered 7. Each one of these having a different cars-Cadillac, Ambassador, Fiat, Maruti, Mercedes, Bedford and Fargo but not necessarily in the same order. Only three people live above the floor on which A lives. Only one person lives between A and the one having a car Cadillac. F lives immediately below the one having a car Bedford. The one having a car Bedford lives on an even-numbered floor. Only three people live between the ones having a car Cadillac and Maruti. E lives immediately above C. E is not having a car Maruti. Only two people live between B and the one having a car Fargo. The one having a car Fargo lives below the floor on which B lives. The one having a car Fiat does not live immediately above D or immediately below B. D does not live immediately above or immediately below A. G does not have a car Ambassador. Question : How many people live between the floors on which D and the one having a car Bedford ?

A

One

B

Two

C

Three

D

Four

Consider the following statements in respect of vapor compression refrigeration units: 1. In actual units the refrigerant leaving the evaporator is superheated 2. Superheating of refrigerant at the exit of evaporator increases the refrigerating effect 3. The superheating of refrigerant increases the work of the compressor Which of the above statements are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

In vapor compression cycle having dry saturated vapor at the end of compression the refrigeration effect is given by? H1 – Enthalpy of vapor before compression H4 – Enthalpy of vapor before entering evaporator H2 – Enthalpy of vapor after compression

A

H1 – H4

B

H2 – H4

C

H1 × H4

D

H2 × H4

Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of C.O.P. of reversed Carnot Cycle?

A

1.25

B

0.8

C

0.5

D

0.25

A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

A

1 kW

B

2 kW

C

3 kW

D

4 kW

For a refrigerating system that works on Bell-Coleman cycle, which one of the following is not a process of the cycle in p-v diagram?

A

Isentropic compression process

B

Constant pressure cooling process

C

Isothermal expansion process

D

Constant pressure expansion process

In vapor compression cycle having dry saturated vapor at the end of compression the work done is given by? H2 – Enthalpy of vapor after compression H1 – Enthalpy of vapor before compression

A

H2 – H1

B

H2 + H1

C

H2 × H1

D

H2 ÷ H1

What is the ratio of the mass of refrigerant flowing through condenser and mass of refrigerant flowing through the evaporator, i.e., m2 / m1? If m1 = mass of refrigerant passing through the evaporator m2 = mass of refrigerant passing through the condenser

A

h2 – h6 / h3 – hf5

B

h1 – h6 / h1 – hf5

C

h2 – h3 / h1 – hf5

D

h2 – h4 / h1 – hf5

In a refrigerating machine working on the reversed Carnot cycle, if the lower temperature is fixed, then what can be done to increase the C.O.P.?

A

Increasing higher temperature

B

Operating machine at higher speed

C

Decreasing higher temperature

D

Operating machine at a lower speed

For a refrigerating system that works on reversed Carnot cycle having vapor as refrigerant, which one of the following is not a process of the cycle in p-v diagram?

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