Related Questions

Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant
A Pressure
B Temperature
C Volume
D Internal energy
The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the
A Temperature & pressure
B Number of intermediate chemical reactions involved
C State of aggregation & the state of combination at the beginning & the end of the reaction
D None of these
The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be
A 0.4
B 0.56
C 0.67
D 1.67
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:
A ΔH = 0 and ΔS = 0
B ΔH ≠ 0 and ΔS = 0
C ΔH ≠ 0 and ΔS ≠ 0
D ΔH = 0 and ΔS ≠ 0
Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of
A Mixing
B Adsorption
C Wetting
D Complete wetting
The enthalpy change when ammonia gas is dissolved in water is called the heat of
A Solution
B Formation
C Dilution
D Combustion
In which form is the supplied heat energy stored during change in temperature of substance?
A Heat energy
B Kinetic energy
C Potential energy
D Both kinetic and potential energy
The ratio of the isentropic heat drop to the heat supplied, is called
A Reheat factor
B Stage efficiency
C Internal efficiency
D Rankine efficiency
Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called __________ solutions.
A Ideal
B Real
C Isotonic
D None of these
How are the efficiencies of any heat engine (miu) and reversible heat engine (miuR) compared, when both are operating between same heat source and same heat sink?
A miu = miuR
B miu>miuR
C miu
D none of these

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