Question for Thermal Engineering

Which type of questions should be ask in interview for job in Thermal Engineering department? Give me list of interview questions.

For job in Thermal Engineering department following questions generally ask in interview:

How many governors are needed for safe turbine operation? Why?

Two independent governors are needed for safe turbine operation:


One is an over speed or emergency trip that shuts off the steam at 10 percent above running speed (maximum speed).

The second, or main governor, usually controls speed at a constant rate; however, many applications have variable speed control.

How will you detect that misalignment is the probable cause of excessive vibration?

Coupling to the driven machine is to be disconnected.

The turbine is to be run alone.

If the turbine runs smoothly, either misalignment, worn coupling or the driven equipment is the cause of the trouble.

In which part of the steam turbine does corrosion fatigue occur?

In the wet stages of the LP cylinder.

In which part of the steam turbine does stress corrosion cracking (SCC) occur?

In the wet stages of the low-pressure turbine.

In which zone of steam turbines has temperature-creep rupture been observed?

Damage due to creep is encountered in high temperature (exceeding 455°C) zones. That is, it has been found to occur in the control stages of the high-pressure and intermediate-pressure turbines where steam temperature sometimes exceed 540°C. In the reheat stage, it has been observed that creep has caused complete lifting of the blade shroud bands.

What are the types of thrust bearings?

Babbitt-faced collar bearings

Tilting pivotal pads

Tapered land bearings

Rolling-contact (roller or ball) bearings

What are the types of turbine seals?

Carbon rings fitted in segments around the shaft and held together by garter or retainer springs.

Labyrinths mated with shaft serrations or shaft seal strips.

Water seals where a shaft runner acts as a pump to create a ring of water around the shaft. Use only treated water to avoid shaft pitting.

Stuffing box using woven or soft packing rings that are compressed with a gland to prevent leakage along the shaft.

What are the basic causes of the problem of rotor failure?

Normal wear.

Fatigue failure due to high stress.

Design deficiency.

Aggressive operating environment

What are the differences between impulse and reaction turbines?

The impulse turbine is characterized by the fact that it requires nozzles and that the pressure drop of steam takes place in the nozzles.

The reaction turbine, unlike the impulse turbines has no nozzles, as such. It consists of a row of blades mounted on a drum. The drum blades are separated by rows of fixed blades mounted in the turbine casing. These fixed blades serve as nozzles as well as the means of correcting the direction of steam onto the moving blades.

In the case of reaction turbines, the pressure drop of steam takes place over the blades. This pressure drop produces a reaction and hence cause the motion of the rotor.

I am doing Thermal Engineering and now preparing for the interviews for job. Will you provide Question for Thermal Engineering for interviews also tell list of areas in which I can get job?

Thermal means ‘Relating to or associated with heat’. Thermal is a source of energy produced through heat.

Question for Thermal Engineering for interviews:

1. What is meant by Quasi-Static Process in Thermodynamics?
Quasi means nearly or almost. So quasi-static process means nearly static process or nearly stationary process, or a process which proceeds with extreme slowness.

2. What are the Instruments Used in Thermodynamics? Derive its Efficiency Equations.

3. Refrigerator:

“It is a device, which produces and maintains the temperature below atmospheric temperature” or

“It is a device which operating in cycle, maintains an enclosed space at a temperature lower than the temperature of the surroundings”.

4. Heat Pump:

It is just opposite to the refrigerator i.e., “It is a device operating in a cycle, maintains a body say B at a temperature higher than the temperature of the surroundings

3. State Second Law of Thermodynamics. Explain with Equations.

4. How is Steam Generated at a Given Pressure?

5. Define of Heat Transfer. What are the Modes of Heat Transfer?

6. What is Convection Heat Transfer? Explain Newton’s Law of Cooling.

Some Employment Areas of thermal engineering:

Engineering Equipment Industries
Thermal Power Stations
Nuclear Power Stations
Energy Conservation Department
Pollution Control Agencies
Oil Exploration And Refining
Space Research Organisation
Aeronautical
Electronics
Automobile
Consultancy
Research and Development

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Answered By StudyChaCha Member