Gas turbine units

Question 1 What is used to mount turbine and compressor blades?
Choose one answer:
a. "Dovetail".
b. Trapezoidal shank
c. Fir-tree shank, serrated
d. All answers are correct. THIS IS CORRECT
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Question 2. The main disadvantages of plate regenerators?
Choose one answer:
a. All answers are correct
b. Repair and cleaning of heat transfer surfaces is difficult
c. Large sheet area subject to the pressure drop of the heating media.
d. Bending of sheets and loads on welded seams.
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Question 3. How is the protection of combustion chamber parts from high
temperatures?
Choose one answer:
a. Primary air and fuel entering the compressor station.
b. Cooling with secondary air.
c. Application of high-heat-resistant alloys on surfaces facing the gas-flame path
d. All answers are correct.
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Question 4. What designs of regenerators are used in the GTU?
Choose one answer:
a. Coil heaters, AVO.
b. Plate and AVO.
c. Shell and tubular.
d. Lamellar and shell-and-tube.
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Question 5 What is the excess air ratio?
Choose one answer:
a. The ratio of air flow to fuel consumption.
b. The ratio of the amount of air required to burn 1 kg of fuel to the theoretically required
c. The amount of air theoretically required to burn 1 kg of fuel.
d. Air consumption for combustion of 1 kg of fuel.
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Question 6 What type of grate are used in compressors and turbines?
Choose one answer:
a. In compressors - diffuser, in turbines - confuser
b. In compressors - confuser, in turbines - diffuser
c. Confusor and in compressors and turbines.
d. Diffuser in both compressors and turbines
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Question 7 What is the purpose of the regenerators in the GTU?
Choose one answer:
a. Heating up compressed air before feeding it into the combustion chamber
b. Heating up combustion products before feeding them into the turbine
c. Intermediate heating of the working fluid during its expansion
d. Intermediate cooling of air during its compression CORRECT
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Question 8. To measure and control what parameter in the GTU use a confuser, a measuring nozzle, a diaphragm with a sharp edge?
Choose one answer:
a. Oil level.
b. Air pressure, gas.
c. Air and gas consumption.
d. Oil consumption.
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Question 9. What cycle provides an increase in the unit capacity of a gas turbine by changing the mass flow rate of the working fluid at a constant pressure increase?
Choose one answer:
a. Cycle of the simplest gas turbine
b. GTU cycle with regeneration
c. Closed-loop gas turbine cycle
d. Cycle of a combined cycle plant
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Question 10. What is the main advantage of multi-shaft gas turbines over single-shaft ones?
Choose one answer:
a. Simplicity in execution
b. Higher efficiency of an axial compressor
c. Higher turbine efficiency.
d. Independent operation of payload and axial compressor.
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