Mechanical Engineering - Thermodynamics

46. 

An open system is one in which

A. heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system
B. mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system
C. both the heat and work as well as mass of the working substance crosses the boundary of the system
D. neither the heat and work nor the mass of the working substance crosses the boundary of the system

Answer: Option C

Explanation:

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47. 

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

A. 800K
B. 1000K
C. 1200K
D. 1400K

Answer: Option A

Explanation:

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48. 

When the gas is heated at constant volume, the heat supplied

A. increases the internal energy of the gas and increases the temperature of the gas
B. does some external work during expansion
C. Both (A) and (B)
D. None of these

Answer: Option A

Explanation:

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49. 

The efficiency of a gas turbine is given by

A.
B.
C.
D.

Answer: Option B

Explanation:

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50. 

In closed cycle gas turbine, the air is compressed

A. isothermally
B. isentropically
C. polytropically
D. none of these

Answer: Option B

Explanation:

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