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Wednesday, 17 September 2014

50 Mechanical Engineering Interview Question and Answer

Mechanical engineering interview question and answer http://upseexam.blogspot.in/

1. What is the difference between Critical Speed and Whirling Speed?
Ans. In Solid mechanics, in the field of rotor dynamics, the critical speed is the theoretical angular velocity which excites the natural frequency of a rotating object, such as a shaft, propeller or gear. As the speed of rotation approaches the objects natural frequency, the object begins to resonate which dramatically increases system vibration. The resulting resonance occurs regardless of orientation. Whirling Speed is due to the unbalanced forces acting on a rotating shaft.

2. How a Diesel Engine Works as Generator?
Ans. Diesel engine is a prime mover, for a generator, pump, and for vehicles etc. generator is connected to engine by shaft. Mostly in thermal power plat, there is an engine is used to drive generator to generate power.

3. Explain Second Law of Thermodynamics?
Ans. The entropy of the universe increases over time and moves towards a maximum value.

4. Compare Brayton Cycle and Otto Cycle?
Ans. The heat addition and rejection processes in Otto cycle are of constant volume, whereas in Brayton cycle, they are of constant pressure. Otto  cycle  is  the  ideal  cycle  for  spark  ignition  engines. Brayton cycle is the ideal cycle for gas power turbines.

5. What is the purpose of Scrapper Ring?
Ans. Scrap the excess lube oil from the cylinder walls. There by preventing oil from entering combustion zone.


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50 Mechanical Engineering Interview Question and Answer

OR

Tuesday, 16 September 2014

TOYOTA DEVELOPS HIGH EFFICIENCY FREE PISTON COMBUSTION ENGINE TO POWER ELECTRIC VEHICLE

TOYOTA DEVELOPS HIGH EFFICIENCY FREE PISTON COMBUSTION ENGINE TO POWER ELECTRIC VEHICLE

Automobile Engineering Interview Question and Answer

Automobile engineering interview question and answer http://upseexam.blogspot.in/

Automobile Engineering Interview Question and Answer


1. Explain the reason that why big tyres are used in rear of vehicles.
Large tyres provide larger surface area touching the ground, thus providing the more pulling power. Basically tractors have larger rear tyres because tractors don’t have to operate at higher speeds, thus getting the same ground speed with larger tyres. Moreover gear ratios don’t have to be as high as b/c of the tyres.

100 MECHANICAL ENGINEERING INTERVIEW QUESTION AND ANSWER


2. What is kingpin offset? State some of its application.
The kingpin offset is the part, basically called as pivot used in the steering of the vehicles. This offset helps in rotating of the steering and thus it’s very useful in steering mechanism of the cars.
Applications: This is also used to measure scrub radius with the help of geometric parameters of wheel plane above and below ground level. 
It provides directional stability to the vehicles when it i combined with the caster.

50 Mechanical Engineering Interview Question and Answer


3. Explain the basic difference between BS2 and BS3 engine.



To Download complete file of Automobile engineering interview question and answer click on the given link:-


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Automobile Engineering Interview Question and Answer


Technical Words and their Full Form in Automobile


TECHNICAL WORDS AND THEIR FULL FORM IN AUTOMOBILE

  1. CRDi - (Common Rail Direct Injection)
  2. TDi - (Turbocharged Direct Ignition)
  3. DTS-i - (Digital Twin Spark Ignition)
  4. VTVT - (Variable Timing Valve Train) 
  5. MPFI - (Multi point fuel injection) 
  6. ABS - (Anti Lock Braking) 
  7. SOHC - ( Single OverHead Camshaft) 
  8. DOHC - (Double Overhead Camshaft) 
  9. SUV - (Sport Utility Vehicle) 
  10. MUV - (Multi Utility Vehicle) 
  11. SAE - (Society of Automotive Engineers) 
  12. HCV - (Heavy Commercial Vehicle) 
  13. LCV - (Light Commercial Vehicle) 
  14. CVTi - (Charged motion Variable Time Ignition) 
  15. CCVTI - (Controlled Combustion Variable Timing Ignition)
  16. EBD - (Electronic Brakeforce Distribution)
  17. BHP - ( Brake Horse Power)
  18. BMEP - (Brake Mean Effective Pressure)
  19. BSFC - (Brake Specific Fuel Consumption
  20. CC - (Cubic Capacity)
  21. CDI - (Capacitor Discharge Ignition)
  22. C.I ENGINE - (Compression Ignition Engine)
  23. CNG - (Compressed Natural Gas)
  24. DFI - (Digital Fuel Injection) 
  25. DI ENGINE - (Direct Injection Engine)
  26. EC ENGINE - (External Combustion Engine)
  27. FHP - (Frictional Horse Power)
  28. GVW - (Gross Vehicle Weight)
  29. HVAC - (Heating ventilating and Air Conditioning)
  30. IC ENGINE - (Internal Combustion Engine)
  31. IHP - (Indicated Horse Power)
  32. IMEP - (Indicated Mean Effective Pressure)
  33. ISFC - (Indicated Specific Fuel Consumption)
  34. Kph - (Kilometer Per Hour)
  35. Kpl - (Kilometer Per Liter)
  36. OHV - (Over Head Valve)
  37. SFC - (Specific Fuel Consumption)
  38. SI ENGINE - (Spark Ignition Engine)
  39. VDB - (Ventilated Disc Brake)
  40. VVTi - (Variable Valve Timing)
  41. 4WD - (Four Wheel Drive(FWD))
  42. 2WD - (Two Wheel Drive)
  43. TC - (Traction Control)
  44. ESC -(Electronic Stability Control)
  45. FPEG -(Free Piston Engine Generator)