Engineering Thermodynamics
One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to

800 K
1400 K
1000 K
1200 K

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Engineering Thermodynamics
Otto cycle consists of

Two constant volume and two isothermal processes
One constant pressure, one constant volume and two isentropic processes
Two constant pressure and two isentropic processes
Two constant volume and two isentropic processes

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Engineering Thermodynamics
An isolated system is one in which

Mass does not cross boundaries of the system, though energy may do so
Neither mass nor energy crosses the boundaries of the system
Mass crosses the boundary but not the energy
Both energy and mass cross the boundaries of the system

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