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

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

There are several types of valves in hydraulics, including directional control valves, pressure control valves, flow control valves, and check valves.

• Directional control valves determine the direction of fluid flow in a hydraulic system.

• Pressure control valves regulate the pressure of the fluid in the system.

• Flow control valves manage the flow rate of the fluid.

• Check valves allow fluid to flow in one direction only, preventing backflow.

• Other types of valves include relief val...read more

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

The most commonly used refrigerant at this time is R-410A, which is a hydrofluorocarbon (HFC) blend.

• R-410A is a popular choice due to its high energy efficiency and environmental friendliness.

• It is commonly used in air conditioning systems and heat pumps.

• R-410A is a hydrofluorocarbon (HFC) blend, which means it does not contain chlorine and is less harmful to the ozone layer compared to older refrigerants like R-22.

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 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

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

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

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

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.

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

Grade of concrete used nowadays varies depending on the specific requirements of the project.

• Grade of concrete is specified by its compressive strength in megapascals (MPa). Common grades include 20, 25, 30, 35, and 40 MPa.

• Higher grade concrete is typically used for structures requiring higher strength, such as high-rise buildings or bridges.

• Lower grade concrete may be suitable for less demanding applications, such as residential construction or pavements.

Spark gap can be calculated using the formula: Spark Gap = (Voltage x Distance) / Pressure

• Calculate the voltage applied across the spark gap

• Measure the distance between the electrodes

• Determine the pressure in the gap

• Use the formula: Spark Gap = (Voltage x Distance) / Pressure

Compressive strength of concrete is a measure of its ability to withstand loads or stress.

• Compressive strength is typically measured in pounds per square inch (psi) or megapascals (MPa).

• Higher compressive strength indicates a more durable and strong concrete mix.

• Factors affecting compressive strength include water-cement ratio, curing conditions, and aggregate quality.

A block diagram of a communication system shows the components and their connections for transmitting and receiving information.

• Components include transmitter, channel, receiver, and noise source

• Transmitter converts message signal into a form suitable for transmission

• Channel carries the signal from transmitter to receiver

• Receiver converts the received signal back into the original message signal

• Noise source introduces unwanted disturbances in the communication process

Merge sort algorithm can be modified to sort an array of strings in descending order.

• Modify the comparison function to sort in descending order

• Use the standard merge sort algorithm

• Ensure that the merge function is also modified to merge in descending order

EDM stands for Electrical Discharge Machining, a non-traditional machining process used to remove material from a workpiece using electrical discharges.

• EDM uses electrical discharges between an electrode and a workpiece to erode material.

• There are two main types of EDM: sinker EDM (also known as die sinking EDM) and wire EDM.

• EDM is commonly used in manufacturing industries for making molds, dies, and other precision parts.

• EDM can achieve high levels of accuracy and intricate ...read more

Sieve analysis is a method used to determine the particle size distribution of aggregates.

• Sieve analysis involves passing a sample of aggregate through a series of sieves with progressively smaller openings.

• The amount of material retained on each sieve is weighed and compared to the total sample weight to determine the percentage passing through each sieve.

• The results of sieve analysis are used to classify aggregates for use in construction projects.

• Sieve analysis helps ensur...read more

Reinforcement details for slab include types of reinforcement, spacing, cover, and lap lengths.

• Types of reinforcement used in slabs include mesh, rebar, and fibers.

• Spacing of reinforcement bars should be as per design specifications to ensure structural integrity.

• Cover refers to the distance between the outer surface of the concrete and the reinforcement bars.

• Lap lengths are important to ensure proper transfer of loads between adjacent reinforcement bars.

• Proper detailing of r...read more

Column width varies depending on the application and design requirements.

• Column width in print media is typically around 50-60 characters per line.

• In web design, column width can vary greatly depending on screen size and layout.

• For coding, recommended line length is often around 80 characters for readability.

Unit weight of steel is typically around 7850 kg/m^3.

• Unit weight of steel is commonly expressed in kg/m^3.

• The unit weight of steel can vary depending on the type of steel being used.

• For example, the unit weight of mild steel is approximately 7850 kg/m^3.

Slump test is a concrete consistency test to measure the workability of fresh concrete.

• Slump test is performed by filling a mold with fresh concrete, then removing the mold and measuring the amount of slump or settlement.

• The slump value indicates the workability of the concrete - higher slump means more workable concrete.

• Different types of slumps include true slump, shear slump, and collapse slump.

• Slump test is important to ensure the concrete can be easily placed and compact...read more

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