Assume the motor is running. What happens when the stop button is pressed and then the start button is pressed immediately?

Q: What is the application of Automatic Change over switch?

A: The power system has to transmit power from the generation side to the load side. For this purpose,…

Q: why is the power not interrupted when the motor makes the transition from start to run?

A: 3-phase motors are commonly self-starting while the dc motors are not self-starting. To run the…

Q: what are designed to protect the motor from an overload condition

A: Overload motor: A motor is connected with excessive load, draws more current, and produces…

Q: Explain (i) control relay and (ii) Thermal overload relay?

A: Control relay A control relay is an electromagnetic device that is most commonly used in protection…

Q: At standstill condition, the back emf is zero, so the motor can be safely turned ON without a…

A:

Q: Question 28 An industrial selector switch would most often have: O double break contacts. O more…

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Q: 2. When multiple start stop pushbuttons are required the stop buttons are connected in and the start…

A:

Q: Question 28 An industrial selector switch would most often have: O double break contacts. O more…

A:

Q: what must be done to prevent excessive motor current?

A: To prevent the excessive motor current various protection schemes are applied for different motor.…

Q: Where is the speed control for a range hood fan located

A:

Q: Develop a relay ladder diagram for the sequence control of two motor starters using a single…

A: To develop relay ladder using nema symbols

Q: What is the function of the double contact pushbutton in a Start-Stop-Jog motor control circuit?

A: Double contact pushbutton is used in the Start-Stop-Jog motor control circuit, its functions are as…

Q: If both the forward and reverse contactors for a motor engage at the same time, what will happen to…

A: In this question we need to discuss what happen when both the forward and reverse contactors for a…

Q: What is the work of the Automatic transmission control system?

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Q: What safely feature does the conbination starter provide that individual motor starting assemblies…

A: The combination starter consists of an across-the-line starter and a disconnect switch. It has a…

Q: Does the Indoor Fan Motor stop when the control fuses faulty?

A: In this question we will see about control fuse importance...

Q: 5. What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is…

A: In this question,  We need to determine the full load current if Power factor = 80% Voltage VL =…

Q: When can full-voltage starting be used?

A:

Q: Why do we connect stop pushbuttons in series in a two - station motor control?

A: Control circuit of two station motor control is as,

Q: 6. What is the full-load current of a 600-volt, 3-phase, 50-horsepower induction motor?

A:

Q: Develop a relay ladder diagram for the sequence control of two motor starters using a single…

A: To develop relay ladder using nema symbols

Q: Q 127. technician a says a throttle by wire system [ETC] eliminate the need for a cruise control…

A: ETC SYSTEM-   ETC stands for the Electronic throttle system.    It is an automatic technology…

Q: Can you explain why a stop button must be normally closed and a start button must be normally open?

A: ⇒The stop button is normally closed and the start button is normally open .⇒Because there is one…

Q: Draw the schematic diagram (power and control circuit) for a 3phase motor starter. When the push…

A: The Induction motors are the asynchronous motor that runs at a speed less than the synchronous. The…

Q: Draw an schematic control diagram of a reversing starter. Use a standard-duty selector switch with…

A: Find the control diagram of a horizontal reversing starter power circuit,

Q: Using the time limit overload or the dashpot overload relay, how are the following achieved:…

A: Using the time limit overload or the dashpot overload relay, the tripping current adjustments are…

Q: How does a Direct On Line Motor Starter work?

A: Types of starting methods of 3-phase induction motor are, Direct On-line Starter Star-Delta Starter…

Q: Assume a motor is running. What happens when the stop button is pressed and then the start button is…

A: Consider that a motor is in a running position. Find what will happen when the stop button is…

Q: Large motor should be connected directly across the line on start up

A: To explain that whether large motor should be connected directly across the line on start up.

Q: If the speed of the driving motor falls due to loading what will be the effects?

A: A motor is a device which convert electrical energy into mechanical energy.The speed (RPM)of a motor…

Q: For a start-stop push button control circuit that has been reconnected so that the start button is…

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Q: The starter must never operate for more than sixty seconds at a time and should rest for two minutes…

A: The starter must never operate for more than sixty seconds at a time and should rest for two minutes…

Q: Explain “hopscotching as an important process in troubleshooting a control system.

A: Many electrical circuit defects such as the switch or motor malfunctioning can be identified by a…

Q: What causes the overload of a starter to open and disable the power circuit?

A: The various causes by which the overload of a starter to open and disable the power circuit is as…

Q: what safety feature does the combination starter provide that individual motor starting assemblies…

A: Solution- The safety feature is the primary requirement of any circuit or any device per their…

Q: overload heater element

A: If an overload heater element is not installed in a two-pole manual starter then the Motor will not…

Q: Why do we use pushbutton type switches for controlling the motor circuit?

A: Push buttons are momentary contacts available as either normally open(NO) or normally closed(NC)…

Q: Draw a circuit diagram of two start push button for synchronize operation with single emergency stop…

A: Circuit diagram of two starts push button for synchronize operation with single emergency stop and…

Q: When selecting motor overload protection devices from where is the full load ampere rating taken?

A: This question is from "Electrical Machine". Under which we are going to study about the overload…

Q: One reason for the use of a reduced voltage starter would be to reduce the high starting current…

A: There are many ways by which we can reduce the high starting currents in motor

Q: Question 28 An industrial selector switch would most often have: O double break contacts. O more…

A: The solution is given below

Q: A selector switch and two - wire pilot device cannot be used to control a large motor directly but…

A: Selector switch and two-wire pilot devices are only used to control lower rating motors.

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.