BHEL Interview Questions and Answers for Freshers

Various metals are used at work sites depending on the application and industry.

• Common metals used include steel, aluminum, copper, and brass.

• Steel is often used in construction and manufacturing for its strength and durability.

• Aluminum is lightweight and corrosion-resistant, making it ideal for aerospace and automotive industries.

• Copper is a good conductor of electricity and is used in electrical wiring and plumbing.

• B...read more

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Hot work safety involves precautions to prevent fires and injuries during welding, cutting, and other heat-producing activities.

• Conduct a risk assessment before starting hot work to identify potential hazards.

• Ensure proper ventilation in the work area to avoid the accumulation of flammable gases.

• Use fire-resistant barriers or blankets to protect nearby combustible materials.

• Have fire extinguishing equipment readily ava...read more

Synchronous motor runs at a constant speed while hysteresis motor has a rotor that follows the rotating magnetic field.

• Synchronous motor is used in applications where constant speed is required, such as in clocks and timers.

• Hysteresis motor is used in applications where precise control of speed is required, such as in record players and tape recorders.

• Synchronous motor has a stator and rotor that rotate at the same spe...read more

PLC is a hardware device that controls industrial processes, while SCADA is a software system that monitors and controls those processes.

• PLC is a programmable logic controller that controls the input/output of industrial processes.

• SCADA is a supervisory control and data acquisition system that collects and analyzes data from the industrial processes.

• PLC is a hardware device, while SCADA is a software system.

• PLC is used...read more

Relays are used for low power applications while contactors are used for high power applications.

• Relays are typically used in control circuits to switch low power loads such as lights and fans.

• Contactors are used to switch high power loads such as motors and compressors.

• Relays have a lower current rating than contactors.

• Contactors have larger contacts and can handle higher currents than relays.

• Relays are typically smal...read more

Switches are used to control the flow of current in a circuit, while relays are used to switch a circuit on or off.

• Switches are manually operated, while relays are electrically operated.

• Switches are used in low voltage applications, while relays are used in high voltage applications.

• Switches are simple in construction, while relays are more complex.

• Examples of switches include light switches and toggle switches, while ...read more

Switch is an electronic component used to connect or disconnect a circuit while a timer is a device used to measure time intervals.

• Switch is used to turn on/off a device while timer is used to control the duration of a device's operation.

• Switch is a binary device with two states (on/off) while timer can be analog or digital and can measure time in seconds, minutes, or hours.

• Examples of switches include light switches, ...read more

Mechanical engineering is the branch of engineering that deals with the design, analysis, and manufacturing of mechanical systems.

• Involves the application of physics, mathematics, and materials science

• Designs and analyzes machines, engines, and other mechanical systems

• Includes areas such as thermodynamics, mechanics, and robotics

• Examples include designing car engines, aircraft structures, and medical devices