IMPORTANT QUESTIONS OF ICGT

I.C.ENGINE AND GAS TURBINES

ME 301 E

PREVIOUS YEAR QUESTIONS OF ICGT

   1.  Derive the terms compression ratio and pressure ratio. Derive the expression evaluate          efficiency work done of an otto cycle using above term.   (BT-5/D07)

   2. With the help of neat sketches, explain the actual sequence of events in the cylinder of a petrol engine working on four stroke cycle.   (BT-5/D06)

   3. Derive an expression for the mean effective pressure of the otto cycle.

   4. What is the difference between actual cycle and air standard cycle? (BT-5/D09)

  5. What are the main advantage and disadvantage of the CI engine as compare to SI engine. In this light discuss the field of application of the two engines. (BT-5/D11)

   6. Explain with suitable sketch the working of four stoke SI engine. (BT-5/D06)

   7. Discuss the difference between ideal and actual valve timing of a petrol engine. (BT-5/D09)

   8. Derive an expression for the efficiency and mean effective pressure of a diesel cycle.         (BT-5/D08)

   9.  What is the function of carburetor in a SI engine? (BT-5/D09)

  10. Describe a battery ignition system with the help of neat sketch? What are main disadvantages   of a battery ignition system?  How these can be overcome? (BT-5/D06)

   11. Discuss with the help of suitable sketch the following (BT-5/D14)

                                  i) Wet sump lubrication system

                                 ii) Dir sump lubrication system

   12.  What is a function of a radiator?  Explain the construction of typical radiator.

   13.  Derive an expression for the efficiency and mean effective pressure of a diesel cycle            (BT-5/D07)

  14. What is the function of a carburetor in a SI engine? Briefly explain with neat sketch the operation of a simple float type carburetor? (BT-5/D04)

   15.  Describe a battery ignition system with the help of neat sketch?   (BT-5/D10)

   16.  Discuss with the help of suitable sketch the following (BT-5/D04)

                  i) Wet sump lubrication system ii) Dry sump lubrication system

   17.  What are the various type of abnormal combustion in an I.C. engine (BT-5/D09)

  18.  Describe the phenomenon in a diesel engine and discuss the influence of ignition delay on knocking in a diesel engine (BT-5/D08)

  19. Explain the effect on the performance for any three operating condition on S.I. engine (BT-5/D07)

   20.  Derive an expression for the volumetric Efficience of a reciprocating (BT-5/D02)

   21.  what is the need of cooling system in a i.c engine explain forced circulation Cooling system (BT-5/D05)

  22. Compare the variable factor or characteristics of S.I. & C.I. engines. Factors or variable should be twenty in number. (BT-5/D07)

   23. With a neat sketch explain the working of a fuel injector. (BT-5/D08)

   24.  With a neat sketch explain the working of a simple carburetor. (BT-5/D14)

   25.  What is the function of a radiator? Explain the construction of a typical radiator. (BT-5/D15)

   26.  Derive an expression for the efficiency on a dual combustion cycle. (BT-5/D09)

   27.  Define the following terms (BT-5/D10)

   28. Octane ratio of fuel, pre-ignition delay period, variable effecting delay period, knock in CI           engine, octane rating

   29.  Explain with neat sketch the “thermo-syphon” cooling. (BT-5/D07)

   30.  What is effect of following on engine friction : (BT-5/D08)

·         Stroke/bore ratio

·         CR 3)oil viscosity

·         engine load

·         cooling water temperature

   31.  Find the power required to compress and deliver2 kg of air per minute from 100n/m and 20 degree to deliver pressure of 7000 n/m when compression is carried out in a single stage compressor b) three stage compressor. (BT-5/D10)

   32.  What are the different types of lubrication system used in CI  engine ? discuss the merits and demerits of charge lubrication(BT-5/D11)

   33.  List the various properties of lubricating oil and the significance of charge lubrication. (BT-5/D12)

   34.  List the various property of lubricating oil and the significance of each property in selecting oil. (BT-5/D14)

   35. Derive an expression for the volumetric efficiency of a single stage reciprocating compressor in terms of the clearance fraction polytropic index of compressor and the pressure ratio.           (BT-5/D08)

   36.  Derive the expression for efficiency and specific work output for a single gas turbine cycle in terms of pressure ratio.  (BT-5/D10)

   37. Estimate the work required for a two stage reciprocating single acting air compressor to compress 2.8 m³ of air per min at 1.05 bar and 10 degree Celsius to a final pressure of 35 bar. The intermediate receiver cools the air to 30 degree and 5.6 bar pressure.    (BT-5/D11)

   38.  During a trial on a four cylinder petrol engine running at 3000 rpm the brake load was 267N when all cylinder were working. When each cylinder was cut in turn and speed returned to 3000rpm, the brake reading were 178 n, 187 n, 182 n , and 182 n. determine 1) friction power 2) indicated power 3) mechanical efficiency.                      (BT-5/D12)

   39.  Derive the expression for the pressure ratio for maximum power for a brayton cycle?  (BT-5/D14)

  40. Prove that the condition for maximum work required for a two stage reciprocating compressor is p₂ = p₁p₃                        (BT-5/D14)

   41.  Explain with neat sketch and TS diagram of the closed and open cycle gas turbine cycle. (BT-5/D08)

  42.  A gas turbine cycle takes in air at 25 Celsius and atmospheric pressure. The compression ratio is 4. The compression efficiency is 75 percent. The inlet temperature to turbine is limited to 750 Celsius what turbine efficiency would give over all cycle efficiency zero percent?             (BT-5/D07)

   43.  explain the method of emission control

   44.  Derive an expression for a volumetric efficiency of a reciprocating compressor                (BT-5/D10)

   45.  Mention different type of cooling system in an engine? (BT-5/D14)

   46.  Explain constructional detail and working of rotary compressor.  ( BT-5/D09)

   47.  Explain note on alternate fuel    ( BT-5/D07)

   48.  Explain the mixture requirement of single stage reciprocating compressor

   49.  Explain pollution from IC engine     (BT-5/D09)

   50.  Explain lubrication system used in IC engine    (BT-5/D06)

   51.  Explain octane rating of fuel

   52.  Explain :    (BT-5/D11)

·         Wankle engine

·         Method of emission control

·         Knocking in CI engine

   53.  Explain    (BT-5/D07)

·         pollution from IC engine

·         working of single stage reciprocating compressor

   54.  Explain    (BT-5/D14)

·         current scenario of pollution from automobiles

·         alternate fuel

   55.  Air enters the compressor of a gas turbine plant operating on brayton cycle at 101 kpa, 27 Celsius. The pressure ratio in the cycle is 6. Calculate the maximum temperature in the cycle and the cycle efficiency.   (BT-5/D09)