Q$3)$ It is a thermodynamic question, use thermo tables

A system consisting of $1$ kg of air undergoes the following cycle:

Process $1-2$: Constant volume heating from $P_1=100$kPa,$T_1=100C$ to $P_2=0\mathrm{.}5$MPa

Process $2-3$: Isobaric compression to $V_3=0\mathrm{.}5m^3$

Process $3-4$: Constant volume cooling to $P_4=2\mathrm{.}141$ bar

Process $4-1$: Isothermal expansion

Assuming air is an ideal gas and using ideal gas table for air $($i$.$e$.,$ using variable specific heat approach$)$:

a$)$ Sketch the cycle on $P-v$ and $T-v$ diagrams.

b$)$ Calculate the work and heat transfer for each processes.

c$)$ Calculate the cycle work and cycle heat transfer.

d$)$ Is this a power cycle or refrigeration cycle?

e$)$ Find the thermal efficiency if this cycle is a power cycle or the coefficient of performance if it is a refrigeration cycle.