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Compressors gas turbine jet engine
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Gas turbine works on Brayton or Atkinson cycle [other wrong options] [Discuss in forum] ![]() ![]() Carnot cycle Rankine cycle Erricsson cycle Joule cycle. |
Q22 ⇒ The work ratio of simple gas turbine cycle depends on all of the above [other wrong options] [Discuss in forum] ![]() ![]() pressure ratio maximum cycle temperature minimum cycle temperature none of die above. |
Q23 ⇒ The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is low [other wrong options] [Discuss in forum] ![]() ![]() high same low/high depending on make and type unpredictable. |
Q24 ⇒ Open cycle gas turbine works on Brayton or Atkinson cycle [other wrong options] [Discuss in forum] ![]() ![]() Carnot cycle Erricsson cycle Joule cycle. |
Q25 ⇒ The fuel consumption in gas turbines is accounted for by low.er heating value [other wrong options] [Discuss in forum] ![]() ![]() higher heating value heating value higher calorific value highest calorific value. |
Q26 ⇒ Gas turbines for power generation are normally used to supply peak load requirements [other wrong options] [Discuss in forum] ![]() ![]() to supply base load requirements to enable start thermal power plant in emergency when other sources of power fail. |
Q27 ⇒ Mechanical efficiency of gas turbines as compared to I.C engines is higher [other wrong options] [Discuss in forum] ![]() ![]() lower same depends on osier considerations unpredictable. |
Q28 ⇒ The ratio of specific weigh/h.p. of gas turbine and I.C engines may be typically of the order of 1 : 6. [other wrong options] [Discuss in forum] ![]() ![]() 1 : 1 2 : 1 4 : 1 1:2 |
Q29 ⇒ The thermal efficiency of a gas turbine as compared to a diesel plant is less [other wrong options] [Discuss in forum] ![]() ![]() same more depends on other factors unpredictably. |
Q30 ⇒ The air-fuel ratio in gas turbines is of the order of 50: 1. [other wrong options] [Discuss in forum] ![]() ![]() 7 : 1 15 : 1 30 : 1 40 : 1 |
Q31 ⇒ The pressure ratio in gas turbines is of the order of 61: 1 [other wrong options] [Discuss in forum] ![]() ![]() ,2:l 4:1 9 : 1 12:1. |
Q32 ⇒ The hottest point in a gas turbine is between ~ to i of the blade height [other wrong options] [Discuss in forum] ![]() ![]() at the base at the tip in the center uniformly heated. |
Q33 ⇒ The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is compressed air before entering the combustion chamber is heated [other wrong options] [Discuss in forum] ![]() ![]() heated bled gas from turbine is heated and readmitted for complete expansion exhaust gases drive the compressor part of exhaust gases are heated and mixed up with atmospheric air to utilize exhaust heat. |
Q34 ⇒ Gas turbine blades are given a rake in the direction of motion of blades [other wrong options] [Discuss in forum] ![]() ![]() equal to zero opposite to the direction of motion of blades depending on the velocity none of the above. |
Q35 ⇒ Efficiency of gas turbine is increased by adding a re generator [other wrong options] [Discuss in forum] ![]() ![]() reheating inter cooling all of the above none of the above. |
Q36 ⇒ Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is lower [other wrong options] [Discuss in forum] ![]() ![]() higher equal can't be compared unpredictable. |
Q37 ⇒ The ideal efficiency of simple gas turbine cycle depends on pressure ratio [other wrong options] [Discuss in forum] ![]() ![]() maximum cycle temperature minimum cycle temperature all of the above none of the above. |
Q38 ⇒ The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio increases [other wrong options] [Discuss in forum] ![]() ![]() decreases first increases and then decreases first decreases and then increases remains same. |
Q39 ⇒ Gas turbines use following type of air compressor axial flow type [other wrong options] [Discuss in forum] ![]() ![]() centrifugal type reciprocating type lobe type none of the above. |
Q40 ⇒ As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio increases [other wrong options] [Discuss in forum] ![]() ![]() decreases remains same first increases and then decreases first decreases and then increases. |
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