Landis+Gyr Quaity Control Engineer Interview Questions and Answers

Q1. Why havells and where do u see yourself after 20 years.
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Q1. What are half wave and full wave rectifiers
Ans. 
Half wave and full wave rectifiers convert AC to DC, differing in efficiency and output waveform.
• Half Wave Rectifier: Uses one diode, allows only one half of AC waveform.

• Example: Simple power supply for low-power devices.

• Full Wave Rectifier: Uses two or four diodes, utilizes both halves of AC waveform.

• Example: More efficient power supply for higher power devices.

• Half wave produces pulsating DC, while full wave produces
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Q2. How can you filter a signal with ripples
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Filtering signals with ripples involves using techniques to reduce unwanted oscillations while preserving desired signal characteristics.
• Use a low-pass filter to attenuate high-frequency ripples while allowing low-frequency signals to pass.

• Apply a moving average filter to smooth out rapid fluctuations in the signal.

• Consider using a Butterworth filter for a smooth frequency response with minimal ripples.

• Employ a Kalman ...read more
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Q1. Asked about type of drive Types of bolts and screws
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Q2. Asked about ETP plant
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Basic IQ questions very easy

Q1. Most of the questions from RAC and fluid mechanics side.
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Q2. What is 1 Tr of refrigeration What is Newtonian and non Newtonian fluid Psychometric chart Entropy/Enthalpy Second law of thermodynamics Design related questions also there if you have run software like s...read more
Ans. 
1 Tr of refrigeration is the amount of heat required to melt 1 ton of ice in 24 hours.
• 1 Tr of refrigeration is equal to 12,000 BTU/hr or 3.517 kilowatts.

• Newtonian fluids have constant viscosity, while non-Newtonian fluids have variable viscosity.

• Psychometric chart is a graphical representation of the thermodynamic properties of air-water mixtures.

• Entropy is a measure of the disorder or randomness in a system, while ent...read more
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Q3. Design related like 3D and 2D
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Q4. Basics and advanced commands in 3-D software
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Q5. Prepare your basics well from Thermal subject
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Technical + Aptitude Test. Minimum 50% to qualify for 2nd round.

Q1. What's your favourite subject and then questions related to it.
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Q2. What projects you have made? Tell me more about this project.
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Q3. What's Factor of Safety, Fatigue failure, Stress, failure theories.
Ans. 
Factor of Safety, Fatigue failure, Stress, failure theories are important concepts in engineering.
• Factor of Safety is the ratio of the maximum stress a material can withstand to the working stress.

• Fatigue failure occurs when a material fails due to repeated loading and unloading.

• Stress is the force per unit area that a material is subjected to.

• Failure theories are used to predict the failure of a material under differe...read more
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Its a mn online aptitude test comprising of 30 aptitude questions and 30 technical questions in total 60 questions.
The technical question background depends upon your stream like [EEand EC , ME]
The time is give of 60min to complete the test.

Q1. The interviwer asked me about myself and my family background and that's it. He asked nothing else more than that as I am from EC stream I expected some of the basic electronics questions.
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