Joshi Jampala Engineering Interview Questions and Answers

Multiple Choice questions concerning Mechanical, Metallurgy departments

Q1. Introduction Whether you worked in any plant for experience gauging ? questions regarding thermodynamics cycles
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Q2. Questions regarding Boilers such as what other parts were present in Boilers ? Why are they mounted ?
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Q1. Electrical related questions
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Q2. What is the function of the pass line in a rolling mill?
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Q1. What is the maximum number of team members you can effectively manage?
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Q1. What is power factor
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Power factor is a measure of how effectively electrical power is being used in a circuit.
• Power factor is the ratio of real power (in watts) to apparent power (in volt-amperes).

• It indicates the efficiency of electrical equipment in converting electrical power into useful work.

• A power factor of 1 means all the power is being used effectively, while a power factor less than 1 indicates wastage of power.

• Inductive loads lik...read more
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Q2. What is different between MCB and dol Starter
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MCB and DOL Starter are both electrical devices used for protection and control, but they have different applications.
• MCB stands for Miniature Circuit Breaker, while DOL Starter stands for Direct-On-Line Starter.

• MCB is used for protecting electrical circuits from overcurrents and short circuits, while DOL Starter is used for starting and stopping motors.

• MCB is a compact device that can be manually reset after tripping,...read more
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Q3. What is ragistance
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Resistance is the opposition to the flow of electric current in a circuit.
• Resistance is measured in ohms (Ω).

• It is caused by factors such as the material of the conductor, its length, and its cross-sectional area.

• Resistance can be calculated using Ohm's Law: R = V/I, where R is resistance, V is voltage, and I is current.

• Higher resistance leads to lower current flow.

• Examples of resistance include the filament in a light
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Q4. What is timer and used
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A timer is a device used to measure and control the passage of time.
• Timers are commonly used in various electrical and electronic systems.

• They can be used for scheduling and automating tasks.

• Timers can be digital or analog, and may have different modes of operation such as countdown or interval timing.

• Examples of timer applications include turning lights on and off at specific times, controlling the duration of industr...read more
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Q5. What is relay what do work
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A relay is an electrical device that acts as a switch, using an electromagnet to control the flow of current in a circuit.
• Relays are used to control high-power devices with low-power signals.

• They consist of an electromagnet, a set of contacts, and a spring.

• When the coil of the electromagnet is energized, it creates a magnetic field that attracts the contacts, closing the circuit.

• Relays are commonly used in industrial a...read more
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Q6. What is vfd
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VFD stands for Variable Frequency Drive.
• VFD is an electronic device used to control the speed and torque of an electric motor.

• It converts fixed frequency and voltage input into variable frequency and voltage output.

• VFDs are commonly used in industrial applications to save energy and improve motor control.

• They can be found in HVAC systems, pumps, fans, conveyors, and other motor-driven equipment.

• VFDs allow for precise c...read more
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Q7. What is ac motor
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An AC motor is an electric motor that operates on alternating current, converting electrical energy into mechanical energy.
• AC motor stands for Alternating Current motor.

• It is commonly used in various applications such as industrial machinery, appliances, and HVAC systems.

• AC motors consist of a stator and a rotor.

• The stator contains coils that produce a rotating magnetic field when supplied with AC current.

• The rotor, wh...read more
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Q8. What is no nc push botton
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A NO NC push button is a type of push button switch that has normally open (NO) and normally closed (NC) contacts.
• NO NC push buttons are commonly used in electrical circuits to control the flow of current.

• The NO contact is open when the button is not pressed and closes when the button is pressed.

• The NC contact is closed when the button is not pressed and opens when the button is pressed.

• These push buttons are often use...read more
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Q9. What is rectifier
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A rectifier is an electrical device that converts alternating current (AC) to direct current (DC).
• Rectifiers are commonly used in power supplies to convert AC voltage to DC voltage.

• They are essential in many electronic devices, such as computers, televisions, and smartphones.

• Rectifiers can be classified into different types, including half-wave rectifiers, full-wave rectifiers, and bridge rectifiers.

• They typically cons...read more
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Q10. What is induction slipring motor
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An induction slipring motor is a type of motor that uses slip rings to provide power to the rotor winding.
• An induction slipring motor is also known as a wound rotor motor.

• It consists of a stator, rotor, and slip rings.

• The slip rings are connected to external resistors or other devices.

• The slip rings allow external control of the rotor circuit.

• This type of motor is commonly used in applications where high starting torqu...read more
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Q11. What is different between ocv and acv
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OCV stands for Open Circuit Voltage and ACV stands for Alternating Current Voltage.
• OCV is the voltage measured when there is no load connected to a circuit.

• ACV is the voltage of an alternating current, which periodically changes direction.

• OCV is typically measured using a voltmeter, while ACV is measured using an oscilloscope.

• OCV is commonly used to determine the state of charge of a battery, while ACV is used to measu...read more
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Q12. What is relay
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A relay is an electrically operated switch that uses an electromagnet to mechanically control the opening and closing of contacts.
• Relays are commonly used in electrical systems to control high-power devices with low-power signals.

• They are used to isolate circuits, amplify signals, and provide electrical protection.

• Relays can be found in various applications such as industrial machinery, automotive systems, and home app...read more
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Q13. What is. a.c.v
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a.c.v stands for alternating current voltage.
• a.c.v refers to the voltage of an alternating current (AC) system.

• It is the measurement of the electrical potential difference in an AC circuit.

• AC voltage constantly changes direction and magnitude over time.

• It is typically measured in volts (V).
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Q1. What is different ac motor and dc motor
Ans. 
AC motors and DC motors differ in their power source and construction.
• AC motors run on alternating current, while DC motors run on direct current.

• AC motors use an alternating magnetic field to generate torque, while DC motors use a permanent magnet or electromagnet.

• AC motors are typically more efficient and require less maintenance than DC motors.

• AC motors are commonly used in household appliances, industrial machinery...read more
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Q2. What is diode
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A diode is an electronic component that allows current to flow in one direction and blocks it in the opposite direction.
• Diodes are commonly used in rectifier circuits to convert AC to DC.

• They have two terminals: an anode (positive) and a cathode (negative).

• When the voltage across a diode is forward-biased, it allows current to flow.

• When the voltage is reverse-biased, it blocks the current.

• Diodes are used in various app...read more
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