Mark True [T] or False [F] in the below statements (Provide your brief explanati

Question

Mark True [T] or False [F] in the below statements (Provide your brief explanation, no more than two sentences) (i) It is possible to compress an ideal gas isothermally in an adiabatic piston-cylinder device. [T or F] (ii) The temperature of air rises as the air is compressed by an adiabatic compressor. [T or F] (iii) To determine the entropy change for an irreversible process between states 1 and 2, the integral integral_1^2 delta Q/T should be performed along the actual process path. [T or F] (iv)The entropy change of the working fluid after completing a cyclic process is always zero. [T or F] (i) It is possible for the entropy change of a closed system to be zero during an irreversible process. [T or F]

Explanation / Answer

Solution :

i) False ( We have Q= delta E + W and in this case both delta E and Q are equal to zero hence not possible)

ii) True (SInce the pressure will rise obviously temperature will increase)

iii) False (The integral should be perforned along the reverse path )

iv) False (The entropy change need not be zero everytime though it might be)

v) True ( This can happen when the system is losing the power of heat and thus decrease in entropy due to heat loss is equal to gain in entropy due to irregularities)

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