Johnson Controls Interview Questions, Process, and Tips

Before apptitude round you will asked to select your stream, so as I'm from ECE I've selected ECE. So questions will be related to that only. In 60 min there were 75 MCQ questions with very bad website UI, So don't get shocked if you see no line breaks in code.

Question are from these domain:
- Microprocessor/Microcontroller (15 questions)
- Digital Electronics (10 questions)
- Analog electronic and Network Theory (10 questions)
- OOPs and psuedocode (15 questions)
- General Apptitude and Logical reasoning (15 questions)
- other basic ECE and CSE questions ( 10 questions)

Out of 70 students they selected only 6 from our college. Try to attempt more than 65 questions to get selected in this round. Fortunately I was selected in apptitude round.

Q1. So before the technical Round they will have 1 hr pre placement talks. After that individual interview will start. If You're from ECE you will strictly be interviewed from ECE subjects only. Partially ther...read more
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Q2. Different between latches and flip flop
Ans. 
Latches and flip flops are sequential logic circuits used to store data. Flip flops are edge-triggered while latches are level-triggered.
• Latches are level-triggered and can be transparent or opaque

• Flip flops are edge-triggered and can be positive or negative edge-triggered

• Latches are simpler and faster than flip flops

• Flip flops are more reliable and less prone to glitches than latches

• Examples of latches include SR latc...read more
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Q3. Draw Jhonson Counter and explain its working?
Ans. 
Johnson Counter is a digital circuit that counts in a cyclic pattern.
• It is a type of shift register with feedback

• It has a sequence of n bits that cycle through 2^n-1 states

• It is used in digital clocks, frequency dividers, and memory address decoding

• Example: 4-bit Johnson counter has a sequence of 0001, 0010, 0100, 1000, 0001, ...

• It can be implemented using D flip-flops or JK flip-flops
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Q4. What is the use of counter and How it is different from Shift registers.
Ans. 
Counters are used to count the number of clock pulses and generate output signals. Shift registers are used to store and shift data.
• Counters are sequential circuits that count the number of clock pulses and generate output signals.

• They can be used in applications such as frequency dividers, event counters, and timers.

• Shift registers are used to store and shift data in a serial manner.

• They can be used in applications su...read more
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Q5. Draw XOR gate write truth table
Ans. 
Draw XOR gate truth table
• XOR gate has two inputs and one output

• Output is 1 only if inputs are different

• Truth table: 0 XOR 0 = 0, 0 XOR 1 = 1, 1 XOR 0 = 1, 1 XOR 1 = 0
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Q6. What are Universal Gates and draw OR gate from one Universal Gate?
Ans. 
Universal Gates are gates that can be used to implement any logic function. OR gate can be drawn from a Universal Gate.
• Universal Gates include NAND and NOR gates

• NAND and NOR gates can be used to implement any logic function

• OR gate can be drawn from a NAND gate by connecting both inputs together

• OR gate can be drawn from a NOR gate by connecting both inputs together and inverting the output
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Q7. Draw block diagram of PID controller
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A PID controller is a feedback control loop that calculates an error value as the difference between a desired setpoint and a measured process variable.
• The block diagram of a PID controller consists of three main components: the proportional, integral, and derivative terms.

• The proportional term produces an output that is proportional to the error signal.

• The integral term produces an output that is proportional to the i...read more
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Q8. Find equivalent resistance of the given circuit
Ans. 
Find equivalent resistance of the given circuit
• Identify series and parallel connections

• Use Ohm's law to calculate individual resistances

• Combine resistances using series and parallel rules

• Final answer should be in Ohms
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Q9. Why 8085 is called 8 bit processor
Ans. 
8085 is called 8 bit processor because it can process 8 bits of data at a time.
• 8085 has an 8-bit data bus and can process 8 bits of data at a time

• It has an 8-bit accumulator and can perform arithmetic and logical operations on 8-bit data

• It has 16-bit address bus which can address up to 64 KB of memory

• Examples of 8-bit processors include Intel 8080, Zilog Z80, and MOS Technology 6502
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Q10. No of intrupts in 8085. Explain all
Ans. 
8085 has 5 interrupts. TRAP, RST 7.5, RST 6.5, RST 5.5, INTR
• 8085 has 5 interrupts: TRAP, RST 7.5, RST 6.5, RST 5.5, INTR

• TRAP is a non-maskable interrupt

• RST 7.5, RST 6.5, and RST 5.5 are maskable interrupts

• INTR is a maskable interrupt and can be enabled or disabled by setting the interrupt enable flip-flop

• Interrupts are used to handle external events and improve the efficiency of the system
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Q11. Difference between Microprocessor and microcontroller
Ans. 
Microprocessor is a single chip CPU while microcontroller is a complete computer on a chip.
• Microprocessor is used in general purpose computing while microcontroller is used in embedded systems.

• Microprocessor has limited on-chip peripherals while microcontroller has on-chip peripherals like timers, ADC, etc.

• Microprocessor requires external memory and peripherals while microcontroller has them on-chip.

• Examples of micropr...read more
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Q12. Different flags in 8086 and its high and low condition
Ans. 
Flags in 8086 and their high and low conditions
• 8086 has 9 flags: Carry, Parity, Auxiliary Carry, Zero, Sign, Trap, Interrupt, Direction, Overflow

• Flags can be set or reset based on the result of arithmetic and logical operations

• High condition means the flag is set, while low condition means the flag is reset
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Q13. Draw Npn aur pnp transistor
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NPN and PNP transistors are drawn using three layers of semiconductor material.
• Draw two vertical lines representing the two outer layers of the transistor.

• Draw a diagonal line connecting the top of the left line to the bottom of the right line for NPN transistor.

• Draw a diagonal line connecting the top of the right line to the bottom of the left line for PNP transistor.

• Add arrows to indicate the direction of current flo...read more
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Q14. Draw and explain different terminal of BJT
Ans. 
Explanation of different terminals of BJT
• BJT has three terminals: emitter, base, and collector

• Emitter is heavily doped and has the highest concentration of charge carriers

• Base is lightly doped and controls the flow of charge carriers from emitter to collector

• Collector is moderately doped and collects the charge carriers from the base

• The direction of current flow is from emitter to collector
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Q15. Different operating region of BJT
Ans. 
BJT has three operating regions: active, saturation, and cutoff.
• Active region: both junctions are forward-biased.

• Saturation region: both junctions are reverse-biased.

• Cutoff region: base-emitter junction is reverse-biased and base-collector junction is forward-biased.

• BJT operates as an amplifier in the active region.

• BJT operates as a switch in the saturation and cutoff regions.
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Q16. Difference between BJT and FET
Ans. 
BJT is a current-controlled device while FET is a voltage-controlled device.
• BJT stands for Bipolar Junction Transistor while FET stands for Field Effect Transistor.

• BJT has a higher gain and faster switching speed than FET.

• FET has a higher input impedance and lower noise than BJT.

• BJT is commonly used in low-power applications while FET is commonly used in high-power applications.

• Examples of BJT include NPN and PNP trans...read more
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Q17. Different analog to digital conversation techniques
Ans. 
Analog to digital conversion techniques include pulse code modulation, delta modulation, and sigma-delta modulation.
• Pulse code modulation (PCM) samples the analog signal at regular intervals and quantizes each sample into a binary code.

• Delta modulation (DM) approximates the slope of the analog signal and encodes the difference between the approximated value and the actual value.

• Sigma-delta modulation (SDM) oversamples ...read more
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Q18. This question was from my project on Robotics arm: 1. Explain Block diagram of your Robotics arm 2. Why are you using servo motor on your robotics arm not other motor and different types of motor
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Q1. What are active power and reactive power in an electrical system?
Ans. 
Active power is the actual power consumed by a system, while reactive power is the power that oscillates between the system and the source.
• Active power is the real power consumed by electrical devices and is measured in watts (W).

• Reactive power is the power that flows back and forth between the source and the load, without performing any useful work.

• The combination of active power and reactive power gives the total pow...read more
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Q2. What are the different types of temperature sensors, and what do RTD and PT100 mean?
Ans. 
Different types of temperature sensors include thermocouples, RTDs, thermistors, and infrared sensors. RTD stands for Resistance Temperature Detector and PT100 is a type of RTD.
• Thermocouples: measure temperature based on voltage produced by two different metals joined together

• RTDs (Resistance Temperature Detectors): measure temperature by changes in electrical resistance

• Thermistors: measure temperature based on changes...read more
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Q3. What is your understanding of Building Management Systems (BMS), and how do they function?
Ans. 
BMS are systems that control and monitor building operations, such as HVAC, lighting, and security, to improve efficiency and occupant comfort.
• BMS integrate various building systems to centralize control and monitoring.

• They use sensors and actuators to collect data and adjust settings based on predefined parameters.

• BMS can optimize energy usage, reduce maintenance costs, and improve occupant comfort.

• Examples of BMS inc...read more
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Q4. What is forward and backward flow in PID control system?
Ans. 
Forward flow is the direct action of the controller on the process, while backward flow is the feedback from the process to the controller in a PID control system.
• Forward flow is the control action that directly affects the process based on the setpoint and error signal.

• Backward flow is the feedback mechanism where the process output is compared to the setpoint to generate an error signal for the controller.

• In a PID co...read more
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Q5. Tell me about your self and experience
Ans. 
I am a Senior Application Engineer with 8 years of experience in developing and implementing software solutions for various industries.
• 8 years of experience in software development

• Proficient in programming languages such as Java, C++, and Python

• Strong background in designing and implementing complex applications

• Experience working with cross-functional teams to deliver high-quality solutions

• Proven track record of succes...read more
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Q6. What is your family background? What is your father do?
Ans. 
My family background is diverse with members in various professions. My father is a retired engineer.
• Diverse family background

• Father is a retired engineer
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Q7. Why you want to change your job?
Ans. 
Seeking new challenges and opportunities for growth in a different environment.
• Desire for new challenges and learning opportunities

• Seeking career advancement and growth

• Interest in working with different technologies or industries

• Better work-life balance or company culture

• Relocation or commute reasons
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Q8. What are Modbus and BACnet in the context of a Building Management System (BMS)?
Ans. 
Modbus and BACnet are communication protocols used in Building Management Systems (BMS) to enable devices to communicate with each other.
• Modbus is a serial communication protocol commonly used for connecting industrial electronic devices. It is simple and easy to implement.

• BACnet is a protocol specifically designed for building automation and control networks. It allows different devices from different manufacturers to...read more
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Very friendly interviewer. Just focus on basic things.

Q1. What is operational Amplifier?
Ans. 
An operational amplifier is a high-gain electronic voltage amplifier with differential inputs and a single output.
• Operational amplifiers are commonly used in analog circuits for signal processing, filtering, and mathematical operations.

• They have a very high input impedance and a very low output impedance.

• Op-amps can be configured in various ways such as inverting amplifier, non-inverting amplifier, summing amplifier, i...read more
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Q2. What is a transistor
Ans. 
A transistor is a semiconductor device used to amplify or switch electronic signals.
• Transistors are fundamental building blocks of modern electronic devices.

• They can amplify electrical signals, control the flow of current, and act as switches.

• There are two main types of transistors: bipolar junction transistors (BJTs) and field-effect transistors (FETs).

• Transistors are used in a wide range of applications, from compute...read more
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Q1. About family and relocation
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Q1. Tell me about yourself?
Ans. 
I am a dedicated and detail-oriented RTR Analyst with a strong background in financial analysis and reporting.
• I have a Bachelor's degree in Accounting and Finance

• I have 3+ years of experience in reconciliations and financial reporting

• I am proficient in using accounting software such as SAP and QuickBooks

• I have a strong attention to detail and problem-solving skills

• I have excellent communication and teamwork abilities
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Q2. Previous organisation experience?
Ans. 
I have 3 years of experience working as a financial analyst at XYZ Corporation.
• Worked as a financial analyst at XYZ Corporation for 3 years

• Analyzed financial data to provide insights and recommendations

• Prepared financial reports and presentations for senior management
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Q3. Journal entries
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Q4. Basic accounting knowledge
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Q5. Reconciliation related questions
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Q1. Previous experience
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Q2. Fixed asset Accounting
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Q3. Accrual Accounting
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