Unit V: DC Motor Overview

What type of energy does a DC Motor convert into mechanical energy?

What component of a DC Motor interacts with the magnetic field of the stationary magnet to apply a torque on the armature?

In a large DC motor, what is used instead of permanent magnets to create the stator's magnetic field?

Which component of a DC motor serves as the device's solid outer frame?

What is the primary function of the yoke in a DC motor?

What is the purpose of a pole shoe in a DC motor?

What is the material usually used for the armature core in a DC motor?

What is the function of carbon brushes in a DC motor?

Why are DC series motors advantageous for high starting loads?

How is speed affected in a DC series motor as the load changes?

What is the speed equation of a DC series motor?

What happens to the speed versus armature current curve up to magnetic saturation in a DC series motor?

What is the main principle a transformer operates on?

What are the main materials used for constructing the core of a transformer?

Which part of a single-phase transformer is used as both a coolant and an insulating medium?

What is the main difference between a DC Shunt motor and a DC Compound motor?

What happens to the speed of a DC Shunt motor when the load is increased?

At what point does the rotor require a very large current to start a heavy load in a DC Shunt motor?

What does the torque vs. armature current curve look like for a DC Series motor before magnetic saturation?

In a DC Compound motor, what is the function of the series winding compared to the shunt field?

What is the main purpose of Buchholz relay in a single-phase transformer?

What happens to the color of silica gel crystals after excessive usage?

What purpose do bushings serve in a transformer?

What is the main function of tap changer in a single-phase transformer?

In a single-phase transformer, what happens when it is operating at no load?

What is the primary counter-balancing current called?

What does the total primary current I1 represent in the transformer equation?

What is the formula for form factor in the context of induced emf?

What are the losses that occur in an actual transformer?

What causes hysteresis loss in a transformer?

What is the reason for using silicon steel material for the core of a transformer?

How can eddy current loss in a transformer be minimized?

What induces an emf in the core of a transformer?

Which losses in a transformer are independent of the load?

What material can be used to construct the core of a transformer to minimize hysteresis loss?

How do copper losses vary in a transformer?

What can be done to minimize eddy current loss in a transformer?

Why do copper losses occur in a transformer?

What is the primary reason for the dissipation of power in a transformer?

How does the use of thin laminations help in reducing losses in a transformer?

What component of a DC Motor interacts with the magnetic field of the stationary magnet to apply a torque on the armature?

Which component of a DC motor acts as the frame for providing structural strength to the motor?

What is the primary function of the stator in a DC motor?

In large DC motors, what is used instead of permanent magnets to create the stator's magnetic field?

What is the rotary component inside a DC motor's casing, surrounded by strong permanent magnets?

What type of material is the armature core usually made of in a DC motor?

What is the primary function of the commutator in a DC motor?

What is the role of the field winding in a DC motor?

What is the main purpose of the pole shoe in relation to the armature?

What kind of motor winding configuration allows the speed of the motor to be dependent on the load?

What happens to the speed of a DC Shunt motor with an increase in load?

What is the main difference between the torque versus armature current curve for a DC Shunt motor and a DC Series motor?

In a DC Compound motor, what effect does allocating more space to the series winding have on the speed with load?

What feature allows a DC Compound motor to provide a combination of shunt and series motor characteristics?

Which characteristic establishes the DC Shunt motor as a constant flux machine?

What is the speed equation for a DC series motor?

What happens to the speed versus armature current curve up to magnetic saturation in a DC series motor?

Which part of a single-phase transformer is mainly responsible for providing a low reluctance path for magnetic flux flow?

In a DC motor, what is the primary function of bushings?

How is the transformer oil typically used in single-phase transformers?

What is the primary component of the no-load current in a transformer responsible for supplying iron losses?

Which color do fresh silica gel crystals typically have, before turning pale pink due to excessive usage?

What is the primary function of the explosion vent in a transformer?

What is the main objective of using tap changer in a single-phase transformer?

Which parameter of the transformer determines the primary winding's current at no load condition?

What is the additional primary current I’1 used for in a transformer?

What is the power factor angle ?1 of the primary side of the transformer based on?

What determines the power factor of the secondary side of a transformer?

What is the main reason for the voltage regulation of a transformer?

What causes the core or iron losses in a transformer?

What is the primary method to minimize hysteresis loss in a transformer?

How can eddy current loss be reduced in a transformer?

What is the main reason for the occurrence of copper losses in a transformer?

How do iron losses in a transformer vary with respect to the load?

What is the best way to minimize constant losses in a transformer?

What is the consequence of high ohmic resistance in the winding conductors of a transformer?

How does using solid iron material for the core impact the eddy current losses in a transformer?

In what scenario would the copper losses in a transformer be at their peak?

What is the primary benefit of varying the load in a transformer?

Why is operating a transformer at a higher frequency not a common practice to reduce losses?