Bachelor of science in mechanical engineering: Questions Alongside Answers


What is a Gibbs Phase Rule


Gibbs stage rule states that for a heterogeneous scheme inward equilibrium with C components in P phases, the bird of freedom F = C - P + 2.



What is an ideal Refrigeration Cycle?

The ideal refrigeration cycle is contrary of Carnot cycle, working every bit a estrus take in instead of every bit a estrus engine.


What is Psychrometry?

Psychrometry is the written report of air together with H2O vapor mixtures for air conditioning



What is the divergence betwixt Absolute humidity together with relative humidity.

The absolute humidity ω is the ratio of masses of the vapor together with air, i.e.ω = mv/ma. The relative humidity φ is the ratio of the vapor pressure level to the saturation vapor pressure level at that temperature, i.e.φ = pv/pv,sat.



What is saturation ration alongside reference to air conditioning

The saturation ratio is the ratio of the absolute humidity to the absolute humidity at saturation, or, ψ = ω/ωsat.



Q: The temperature of a house is 35 °C alongside a relative humidity of 40%. Can it live cooled using a conventional air cooler?

Ans: We take away to discovery the moisture bulb temperature for the point T = 35°C and φ = 40% using a Psychrometric Chart. As per the chart, the moisture bulb temperature is betwixt twenty together with 25°C. So the house tin hand notice live cooled downward to a comfortable temperature using an evaporative cooler.




Q: The temperature of a palce is 37 °C alongside relative humidity of 83%. To what temperature tin hand notice it live cooled using a conventional air cooler?

Ans: The moisture bulb temperature is close 34.2°C for this situation. Thus, ordinary cooler cannot live used to cut down room temperature. You volition take away to role an air conditioner.



Q: What is the device used inward ships together with submarines to command buoyancy together with stability?

Ans: Ballast Tank


Q: What is the latest tendency inward Predictive Maintenance?

Ans: Model Based Condition Monitoring


Q: What is Model Based Condition Monitoring

This method involves spectral analysis on the motor’s electrical flow together with voltage signals together with and hence compares the measured parameters to a known together with learned model of the motor to diagnose diverse electrical together with mechanical anomalies


Q: What is TPM

Ans: Total Productive Management (TPM) is a scheme of maintaining together with improving the integrity of production together with lineament systems through the machines, equipment, processes, together with employees that add business value to an organization.


Q: As per TPM, how Overall Equipment Effectiveness is calculated?

Ans: OEE has iii factors which are multiplied to hand 1 mensurate called OEE
Performance x Availability x Quality = OEE

Each factor has 2 associated losses making half dozen inward total, these half dozen losses are every bit follows:

Performance = (1) running at reduced speed - (2) Minor Stops

Availability = (3) Breakdowns - (4) Product changeover

Quality = (5) Startup rejects - (6) Running rejects



Q: What is the divergence betwixt TPM together with TQM ?

Ans: TQM focuses on the lineament of the product, spell TPM focuses on the equipment used to create the products. TQM together with TPM tin hand notice both resultant inward an increase of quality. TPM tin hand notice live seen every bit a agency to assistance achieving the destination of TQM

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