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- Question
The compression ratio in petrol engine is kept less than in Diesel engine because
Options- A. it makes petrol engines lighter
- B. higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
- C. less compression ratio gives better performance
- D. it is just customary to have less compression ratio in petrol engines
- Correct Answer
- higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
- 1. Thermoplastic materials are those materials which
Options- A. are formed into shape under heat and pressure and results in a permanently hard product
- B. do not become hard with the application of heat and pressure and no chemical change occurs
- C. are flexible and can withstand considerable wear under suitable conditions
- D. are used as a friction lining for clutches and brakes Discuss
- 2. Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes?
Options- A. Drawing
- B. Extrusion
- C. Rolling
- D. Extrusion and rolling Discuss
- 3. If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by
Options- A.
- B.
- C.
- D.
Discuss
- 4. In a screw jack, the effort required to lower the load W is given by
Options- A. P = W tan(? - ?)
- B. P = W tan(? + ?)
- C. P = W tan(? - ?)
- D. P = W cos(? + ?) Discuss
- 5. When a particle moves along a circular path with uniform velocity, there will be no tangential acceleration.
Options- A. Correct
- B. Incorrect Discuss
- 6. Which of the following statement is wrong as regard to down milling?
Options- A. It can not be used on old machines due to backlash between the feed screw of the table and the nut.
- B. The chips are disposed off easily and do not interfere with the cutting.
- C. The surface milled appears to be slightly wavy.
- D. The coolant can be poured directly at the cutting zone where the cutting force is maximum. Discuss
- 7. A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a
Options- A. notch
- B. weir
- C. mouthpiece
- D. nozzle Discuss
- 8. In a reaction turbine, when steam flows through the fixed blades,
Options- A. pressure increases while velocity decreases
- B. pressure decreases while velocity increases
- C. pressure and velocity both decreases
- D. pressure and velocity both increases Discuss
- 9. In a riveted joint, when the number of rivets decreases from the inner most row to outer most row, the joint is said to be
Options- A. chain riveted
- B. zig-zag riveted
- C. diamond riveted
- D. none of these Discuss
- 10. When a particle moves along a circular path, its acceleration has two components, one is normal component and the other is tangential component of acceleration.
Options- A. True
- B. False Discuss
More questions
Correct Answer: do not become hard with the application of heat and pressure and no chemical change occurs
Correct Answer: Extrusion and rolling
Correct Answer:
Correct Answer: P = W tan(? - ?)
Correct Answer: Correct
Correct Answer: The surface milled appears to be slightly wavy.
Correct Answer: mouthpiece
Correct Answer: pressure decreases while velocity increases
Correct Answer: diamond riveted
Correct Answer: True
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