Compressors, Gas Turbines and Jet Engines - Set 02 - ObjectiveBooks

# Compressors, Gas Turbines and Jet Engines - Set 02

## Practice Test: Question Set - 02

1. To avoid moisture troubles, the branch connections from compressed air lines should be taken from
(A) Top side of main
(B) Bottom side of main
(C) Left side of main
(D) Right side of main

2. In an axial flow compressor, the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as
(A) Work factor
(B) Slip factor
(C) Degree of reaction
(D) Pressure coefficient

3. To avoid moisture troubles, the compressed air main line should
(A) Rise gradually towards the point of use
(B) Drop gradually towards the point of use
(C) Be laid vertically
(D) Be laid exactly horizontally

4. The volumetric efficiency of a compressor
(A) Increases with decrease in compression ratio
(B) Decreases with decrease in compression ratio
(C) Increases with increase in compression ratio
(D) Decreases with increase in compression ratio

5. The efficiency and work ratio of a gas turbine plant can be increased by
(B) Injecting water in/around combustion chamber
(C) Reheating the air after partial expansion in the turbine
(D) All of the above

6. The capacity of compressor will be highest when its intake temperature is
(A) Lowest
(B) Highest
(C) Anything
(D) Atmospheric

7. The volume of air sucked by the compressor during its suction stroke is called
(A) Free air delivery
(B) Compressor capacity
(C) Swept volume
(D) None of these

8. 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 inter-cooler

9. Standard air is the air at ________ and relative humidity of 36 percent.
(A) 0.1 bar and 20°C
(B) 1 bar and 20°C
(C) 0.1 bar and 40°C
(D) 1 bar and 40°C

10. Out of the following, from where you will prefer to take intake for air compressor
(A) From an air conditioned room maintained at 20°C
(B) From outside atmosphere at 1°C
(C) From coal yard side
(D) From a side where cooling tower is located nearby

11. When air is to be compressed at a high pressure, then it is advantageous to use
(A) Single stage compression
(B) Multistage compression without intercooling
(C) Multistage compression with intercooling
(D) None of these

12. In multistage compressor, the isothermal compression is achieved by
(A) Employing inter-cooler
(B) By constantly cooling the cylinder
(C) By running compressor at very slow speed
(D) By insulating the cylinder

13. The compressor capacity is defined as the
(A) Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
(B) Volume of air delivered by the compressor
(C) Volume of air sucked by the compressor during its suction stroke
(D) None of the above

14. The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is
(A) Less
(B) More
(C) Same
(D) More/less depending on compressor capacity

15. Reheating in a multistage expansion gas turbine ________ compressor work.
(A) Has no effect on
(B) Decreases
(C) Increases
(D) None of these

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