BHEL Model Questions 3

1.      Which is not present in CI engines?
Ans. carburettor.

2.      What will happen if one cylinder receives more amount of fuel spray from injectors than other injectors?

3.      Purpose of draft tube in hydraulic turbines?
Ans: The purpose of a draft tube is to convert some of the kinetic energy of the flow from the runner (the rotating part of the turbine) into pressure energy and thereby increase the efficiency of the hydro power turbine.

4.      What is the effect of reheater in the gas turbine?

5.      Ans: The advantage of reheater is significantly increased thrust; the
disadvantage is it has very high fuel consumption and inefficiency.

6.      Problems involving with friction coefficient.

7.      Factor of safety = Yield stress/Working stress.

8.      Which is the example of non parallel power transmission (Universal coupling)?

9.      For perpendicular shafts worm gear is used?

10.  A planet gear with 25 teeth is meshed with a sun gear of 100 teeth. Both are connected using an arm. How many rotations are needed for planet gear to complete one rotation around the sun gear?

11.  What is equivalent spring constant for spring in parallel?

12.  Some questions were asked related to boundary layer and vortex flow.

13.  Five questions were asked in PERT, Process planning, Product planning, Break even analysis.

14.  How tungsten and sintered composite materials are machined?
Ans: (Electro Discharge Machining, EDM)

15.  First law of thermodynamics?

Ans: (Q=W+dE)