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.Management Sciences
Category: Compressors, Gas Turbines and Jet Engines
Pick up the false statement ?
A. gas turbine is a self-starting unit
B. gas turbine does not require huge quantity of water like steam plant
C. exhaust losses in gas turbine are high due to large mass flow rate
D. overall efficiency of gas turbine plant is lower than that of a reciprocating engine
E. gas turbine can be easily started and stopped and thus is best suited for peaking demands
The clearance volume of the air compressor is kept minimum because____________________?
A. it allows maximum compression to be achieved
B. it greatly affects volumetric efficiency
C. it results in minimum work
D. it permits isothermal compression
E. none of the above
Producer gas is produced by_____________________?
A. carbonisation of coal
B. passing steam over incandescent coke
C. passing air and a large amount of steam over waste coal at about 65°C
D. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
E. same way as the natural gas
An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes_______________?
A. one adiabatic, two isobaric, and one constant volume
B. two adiabatic and two isobaric
C. two adiabatic, one isobaric and one constant volume,
D. one adiabatic, one isobaric and two constant volume
E. two isobaric, two adiabatic and one constant volume
The air-fuel ratio in gas turbines is of the order of ______________________?
A. 7 : 1
B. 15 : 1
C. 30 : 1
D. 40 : 1
E. 50: 1
In gas turbines^ high thermal efficiency is obtained in_________________?
A. closed cycle
B. open cycle
C. both of the above
D. closed/open depending on other con-siderations
E. unpredictable
Which is false statement about multistage compression ?
A. Power consumption per unit of air delivered is low
B. Volumetric efficiency is high
C. It is best suited for compression ratios around 7:1
D. The moisture in air is condensed in the intercooler
E. Outlet temperature is reduced
In multistage compressor, the isothermal compression is achieved by_________________?
A. employing intercooler
B. by constantly cooling the cylinder
C. by running compressor at very slow speed
D. by insulating the cylinder
E. none of the above
Choose the correct statement ________________?
A. gas turbine requires lot of cooling water
B. gas turbine is capable of rapid start up and loading
C. gas turbines have flat efficiency at part loads
D. gas turbines have high standby losses and require lot of maintenance
E. gas turbines can be used to generate power only
The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio_____________________?
A. increases
B. decreases
C. first increases and then decreases
D. first decreases and then increases
E. remains same
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