007. 17 Mechanical Engineering interview questions

1. What is the difference between scavenging and supercharging ?

Ans: Scavenging is procedure of eliminating out used fumes from engine cyndrical tube by presenting fresh air in the cyndrical tube before fatigue action ends. Supercharging is the procedure of providing greater mass of air by contracting the environmental air.

2. What are what they are given to continuous warm range, continuous stress, continuous quantity, continuous inner energy, continuous enthalpy, and continuous entropy procedures.

Ans: Isothermal, isochroic, isobaric, free appearance, throttling and adiabatic procedures respectively.

3. In a Rankine pattern if highest possible vapor stress is improved keeping vapor warm range and condenser stress same, what will happen to dry skin portion of vapor after development ?

Ans: It will reduce.

4. Why entropy change for a undoable adiabatic procedure is zero ?

Ans: Because there is no warm transfer in this procedure.

5. What are two essential conditions of perfect gas ?

Ans: It meets formula of state and its specific warms are continuous.

6. Enthalpy and entropy are features of one single parameter. Which is that ?

Ans: Temperature.

7. Why rate of moisture build-up or condensation is greater on a refined area compared to corroded area ?

Ans: Polished area encourages fall sensible moisture build-up or condensation and does not wet the outer lining area.

8. How much level of resistance is provided to warm flow by fall sensible moisture build-up or condensation ?

Ans: Nil

9. What is the link between COP of chilling and warming ?

Ans: COP of warming is one(unity) more than COP of chilling.

10. How much is the perform done in isochoric procedure ?

Ans: Zero.

11. When highest possible release is acquired in misting nozzle ?

Ans: At the crucial stress rate.

1. Under what situation the perform done in reciprocating air compressor will be least ?

Ans: It is least when stress procedure techniques isothermal. For this objective, efforts are made to awesome the air during stress.

13. What is the distinction between slowing down and rising in turning compressions ?

Ans: Stalling is a local trend and it happens when How smashes away from the rotor blades. Surging causes complete guide to circulation and as such it impacts the whole device.

14. Why the engine unit of a fan with in reverse rounded rotor blades is never got bombarded under any situation ?

Ans: The utmost energy is absorbed at about 70% of highest possible circulation in case’of fan with in reverse rotor blades. For greater circulation, energy intake gets lower.

15. Why the perform per kg of air circulation in axial circulation air compressor is less in comparison to centrifugal air compressor for same stress rate ?

Ans: Isentropic performance of axial circulation air compressor is greater.

16. What is the name given to section of heat energy to be actually refused to atmosphere ?

Ans: Anergy.

17. What is ugly pitting ? How it is triggered ?

Ans: Non consistent deterioration over the entire steel area, but happening only in small sets is known as ugly pitting. It is triggered by deficiency of consistency in steel.