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050/23

Which of the following is a correct statement ?

A) areversible adiabatic process is an isentropic process

B) an isentropic process is an adiabatic process

C) an irreversible adiabatic process is a constant entropy process
D) entropy decreases during an irreversible adiabatic process

For the same compression ratio and heat supplied, the air standard efficiency of an
Otto cycle compared to that of a Diesel cycle is

A) less B) equal C) more D) unpredictable

Which parameter can be considered to remain constant if the value of exponent n
in the polytropic equation pv" = Constant talks a unit value ?

A) enthalpy B) internal energy

C) entropy D) pressure or volume

As differentials, heat and work would be described mathematically as

A) exact B) discontinuity C) inexact D) point function

The mean effective pressure of an Otto cycle is

A) Independent of pressure ratio

B) Inversely proportional to pressure ratio

C) Proportional to the square root of pressure ratio
D) Directly proportional to pressure ratio

For a given set of operating pressure limits of a Rankine cycle, the highest efficiency
occurs for

A) superheated cycle
C) reheat cycle

B) saturated cycle
D) regenerative cycle

The steam engine part which guides motion of the piston rod and prevents it from
bending is called

A) crankshaft B) cross head C) valve rod 9 D) eccentric

In an impulse react

ion turbine, the heat drops in the fixed and moving blades are

20 kJ/kg and 40 kJ/kg respectively. The degree of reaction for this stage will be

A) 1/2

For subsonic flow

B) 2/39 C) 18 D) None of the above

hrough a nozzle, the following changes occur in velocity and

pressure along the

low direction

A) pressure decreases, velocity increases

B)
0)
0)

increase in both

pressure increases, velocity decreases

pressure and velocity

velocity increases and pressure remains constant