40+ Deputy Engineer Interview Questions and Answers

The diesel engine, alternator, rectifier, and propulsion equipment work together to power and drive a diesel locomotive.

• The diesel engine is responsible for converting diesel fuel into mechanical energy to power the locomotive.

• The alternator generates electricity to power the various electrical systems on the locomotive.

• The rectifier converts the alternating current (AC) produced by the alternator into direct current (DC) for use by the locomotive's systems.

• The propulsion equ...read more

At zero modulation index, the transmitted current will be zero. At modulation index m, the transmitted current will be proportional to m.

• At zero modulation index, Ic is the transmitter and the transmitted current is zero.

• At modulation index m, the transmitted current will be proportional to m.

• The relationship between modulation index and transmitted current can be expressed as: I_transmitted = m * Ic.

A locomotive consists of various components such as engine, wheels, brakes, and electrical systems that work together to power and control the train.

• Engine: Provides power to move the train by burning fuel or using electricity.

• Wheels: Connect the locomotive to the tracks and allow it to move forward and backward.

• Brakes: Control the speed and stop the train when needed.

• Electrical systems: Provide power for lights, signals, and other functions on the train.

• Transmission: Transfe...read more

AC motors use alternating current to create a rotating magnetic field, while DC motors use direct current to generate a constant magnetic field. Locomotives use various communication systems like GSM-R and Wi-Fi.

• AC motors rely on alternating current to create a rotating magnetic field, which drives the motor's rotation.

• DC motors utilize direct current to establish a constant magnetic field, resulting in continuous rotation.

• Types of communication systems used in locomotives in...read more

Considerations for selecting materials for mechanical components include strength, durability, corrosion resistance, cost, and compatibility with other materials.

• Strength: Ensure the material can withstand the required loads and stresses.

• Durability: Choose a material that will not degrade or wear out quickly over time.

• Corrosion resistance: Select a material that is resistant to corrosion if the component will be exposed to harsh environments.

• Cost: Balance the cost of the mate...read more

Pressure is the force applied on a surface, while stress is the internal resistance of a material to deformation.

• Pressure is an external force per unit area, while stress is an internal force per unit area.

• Pressure can be measured using instruments like pressure gauges, while stress is calculated using formulas.

• Pressure is typically exerted on fluids or gases, while stress is experienced by solid materials.

• Examples of pressure include atmospheric pressure, blood pressure, and...read more

IGBT is a semiconductor device used in power electronics, compressor works by increasing pressure of a gas, braking system in locomotive uses friction to slow down the train.

• IGBT stands for Insulated Gate Bipolar Transistor, used for switching high power loads in electronic circuits.

• Compressor increases the pressure of a gas by reducing its volume, commonly used in air conditioning systems and refrigerators.

• Braking system in locomotive uses friction between brake pads and whe...read more

The least count of a vernier caliper is 0.02 mm and the least count of a screw gauge is 0.01 mm.

• Vernier caliper least count: 0.02 mm

• Screw gauge least count: 0.01 mm

Identify resistor values using color codes, multimeters, and standard values for accurate circuit design.

• Use the color code: Each color represents a number; for example, red = 2, green = 5.

• Measure with a multimeter: Set to resistance mode to directly read the resistor value.

• Refer to standard E12/E24 series: Common resistor values include 10Ω, 100Ω, 1kΩ, etc.

Various tests are conducted on cement to ensure quality and performance.

• Fineness test to measure the particle size of cement

• Setting time test to determine the time taken for cement to set

• Soundness test to check for volume stability

• Compressive strength test to assess the strength of cement

• Chemical analysis to determine the composition of cement

MTTR stands for Mean Time To Repair. Predictive maintenance planning involves analyzing data to identify potential equipment failures.

• MTTR is the average time it takes to repair a failed piece of equipment.

• To plan predictive maintenance, data is collected and analyzed to identify patterns and potential failures.

• This data can include equipment usage, environmental factors, and historical maintenance records.

• Based on this analysis, maintenance schedules can be adjusted to preve...read more

Stress is a measure of the internal force experienced by a material due to external factors.

• Stress is the force per unit area exerted on a material.

• It is a measure of the internal resistance of a material to deformation.

• Stress can be caused by external factors such as applied forces, temperature changes, or pressure.

• The unit of stress is typically expressed in pascals (Pa) or pounds per square inch (psi).

• For example, when a weight is placed on a table, the stress on the table...read more

Battery work involves designing, testing, and maintaining batteries for various applications.

• Designing battery systems for specific requirements

• Testing batteries for performance and safety

• Maintaining batteries to ensure longevity and efficiency

Stainless steel is a type of steel alloy with a minimum of 10.5% chromium content, which gives it its corrosion-resistant properties.

• Stainless steel contains at least 10.5% chromium, which forms a protective oxide layer on the surface.

• Other common elements in stainless steel include nickel, molybdenum, and carbon.

• Different grades of stainless steel have varying compositions for specific applications.

• Examples of stainless steel grades are 304, 316, and 430.

The tiers are black to indicate the level of expertise or access in a hierarchical system.

• Black is often associated with power, authority, and sophistication, making it a suitable choice for tiers in a hierarchical structure.

• Using different colors for tiers may cause confusion or misinterpretation of the hierarchy.

• Black is a neutral color that can easily be paired with other colors for design purposes.

• Consistency in color coding helps in maintaining clarity and organization w...read more

The code of overlap of steel is IS:800-2007.

• The code of overlap of steel is specified in IS:800-2007.

• The code provides guidelines for the design and construction of steel structures.

• It covers aspects such as material properties, design considerations, and construction practices.

Types of dams include gravity dams, arch dams, and embankment dams. Hydraulic losses in a pipeline can be calculated using the Darcy-Weisbach equation.

• Types of dams: gravity dams (e.g. Hoover Dam), arch dams (e.g. Glen Canyon Dam), embankment dams (e.g. Three Gorges Dam)

• Hydraulic losses formula for pipeline: Darcy-Weisbach equation - h_f = f * (L/D) * (V^2/2g)

• Where h_f is the head loss, f is the Darcy-Weisbach friction factor, L is the length of the pipe, D is the diameter of...read more

Admixtures are chemicals added to concrete or mortar to modify its properties.

• Admixtures can improve workability, durability, and strength of concrete.

• They can reduce water content, increase setting time, or enhance color.

• Examples include water-reducing admixtures, air-entraining admixtures, and accelerating admixtures.

A processor block diagram shows the components and their interconnections.

• A processor consists of an arithmetic logic unit (ALU), control unit, and registers.

• The ALU performs arithmetic and logic operations.

• The control unit manages the flow of data and instructions.

• Registers store data and instructions temporarily.

• The processor communicates with other components via buses.

• Examples of processors include Intel Core i7, AMD Ryzen, and ARM Cortex-A53.

Erection and commissioning refer to the process of setting up and making operational a new system or equipment.

• Erection involves assembling and installing the components of a system or equipment according to the design specifications.

• Commissioning involves testing, adjusting, and fine-tuning the system or equipment to ensure it functions correctly and efficiently.

• Erection and commissioning are crucial steps in the implementation of any new project or equipment.

• Examples includ...read more

Preventive maintenance plan includes Why Why Why analysis to identify root cause of problems and prevent future occurrences.

• Preventive maintenance plan is a proactive approach to maintenance that involves regularly scheduled inspections, repairs, and replacements to prevent equipment failure.

• Why Why Why analysis is a technique used to identify the root cause of a problem by asking 'why' multiple times until the underlying cause is revealed.

• By incorporating Why Why Why analysi...read more

Compressors are mechanical devices that increase the pressure of a gas by reducing its volume.

• There are two main types of compressors: positive displacement and dynamic.

• Positive displacement compressors work by trapping a volume of gas and then reducing its volume to increase pressure.

• Examples of positive displacement compressors include reciprocating, rotary screw, and scroll compressors.

• Dynamic compressors work by accelerating the gas to high velocity and then converting th...read more

Shuttering level can be checked using a spirit level to ensure it is horizontal or vertical.

• Use a spirit level to check if the shuttering is horizontal or vertical

• Ensure the bubble in the spirit level is centered to indicate level

• Adjust the shuttering as needed to achieve the correct level

• Check multiple points along the shuttering to ensure consistency

Batteries are used in vehicles to power various electrical components such as lights, radio, and engine starting.

• Batteries provide the necessary electrical energy to start the vehicle's engine.

• They power essential components like lights, radio, and air conditioning.

• Electric vehicles rely entirely on batteries for propulsion.

• Batteries store energy generated by the vehicle's alternator for later use.

Optimized code for finding pairs in an array that sum up to a given value

• Use a hash table to store the difference between the target value and each element in the array

• Iterate through the array and check if the current element is in the hash table

• If it is, then a pair with the target sum has been found

• Time complexity can be reduced to O(n) using this approach

AC cycle works by using a refrigerant to absorb heat from inside a space and release it outside, creating a cooling effect.

• AC cycle starts with the refrigerant absorbing heat from inside the space, cooling the air.

• The refrigerant then moves to the compressor where it is pressurized and heated.

• Next, the hot refrigerant moves to the condenser coil where it releases heat to the outside air.

• The refrigerant then goes through an expansion valve, reducing its pressure and temperatur...read more

Campani name refers to the name of a type of bell foundry in Italy known for producing high-quality bells.

• Campani name is a term used in the context of bell-making in Italy.

• It is associated with producing bells of exceptional quality and craftsmanship.

• An example of a famous Campani name is the Pontifical Foundry Marinelli in Agnone, Italy.