Engineering Thermodynamics
Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant)

Both (B) and (C)
cv/ cp =R
cv = R/ γ-1
cp - cv = R

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Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

All of these
When heat is being absorbed, temperature of hot source and working substance should be same
Free expansion or friction resisted expansion/compression process should not be encountered
When beat is being rejected, temperature of cold source and working substance should be same

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Engineering Thermodynamics
Gases have

No value of specific heat
Two values of specific heat
Under some conditions one value and sometimes two values of specific heat
Only one value of specific heat

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