1. a reversible hear engine
2. a reversible heat pump or a reversible refrigerator
3. an irreversible heat engine
4. an irreversible heat pump or an irreversible refrigerator
a reversible hear engine
1. The internal energy of the gas decreases from its initial value, but the enthalpy remains constant
2. The internal energy of the gas increases from its initial value, but the enthalpy remains constant
3. Both internal energy and enthalpy of the gas remain constant
4. Both internal energy and enthalpy of the gas increase
Both internal energy and enthalpy of the gas remain constant
1. 10°C
2. 20°C
3. 30°C
4. 400C
20°C
1. 0(N. m)/(kg/s)
2. 1.25 (N. m)/(kg/s)
3. 2.5 (N. m)/(kg/s)
4. 3.75 (N. m)/(kg/s)
3.75 (N. m)/(kg/s)
1. 720 kJ/kg
2. 2280 kJ/kg
3. 1500 kJ/kg
4. 3000 kJ/kg
720 kJ/kg
1. 0.57
2. 1.13
3. 2.26
4. 4.52
1.13
1. 0.25
2. 0.5
3. 0.75
4. 1
0.5
1. ∂T/∂x=20 K/m, ∂T/∂y=0 K/m
2. ∂T/∂x=0 K/m, ∂T/∂y=10 K/m
3. ∂T/∂x=10 K/m, ∂T/∂y=10 K/m
4. ∂T/∂x=0 K/m, ∂T/∂y=20 K/m
∂T/∂x=0 K/m, ∂T/∂y=20 K/m
1. is valid only if the process is both reversible and adiabatic
2. is valid only if the process is both reversible and isothermal
3. is valid for any reversible process
4. is incorrect; it must be
is valid for any reversible process
1. mn
2. 2(m + n)
3. m + n
4. m + n – 1
m + n – 1