Electrical Machines – I Important Questions – EM – I Imp Qusts

Electrical Machines – I Important Questions Pdf file – EM – I Imp Qusts

Please find the attached pdf file of Electrical Machines – I Important Questions Bank – EM- 1 Imp Qusts

Link – EM-I Question Bank

UNIT-I

Electromechanical Energy Conversion

1. Write the expressions of energy stored in capacitor and inductor
2. Define Fleming’s right hand rule
3. On what factors, the EMF induced in a coil rotating in a magnetic field is depending?

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UNIT-II
D.C. Generators & Armature Reaction

1. What is the necessity of laminating the armature core of a DCgenerator?
2. What do you mean by “back e.m.f” in DC Machine?
3. Mention the types of armature winding and their specifications.

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UNIT-III
Types of D.C Generators & Load Characteristics

1. Mention the three important characteristics of a DC generator.
2. What are magnetic saturation and residual magnetism in DC generators?
3. Draw the external characteristics of series wound DC generator.

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UNIT-1V
D.C. Motors & Speed Control Methods

1. Would you list out the types of DC generators based on field connections?
2. Write the expression for speed of DC motor in terms of number of conductors, supply voltage and armature current?
3. Show that, armature torque developed by motor is proportional to number poles and armature current.

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UNIT-V
Testing of D.C. Machines

1. Mention the various losses that occur in DCmachines?
2. Write down mechanical efficiency and electrical efficiency expressions in terms of Eg & Ia, for DC generator?
3. What is the condition for maximum efficiency of any DC machine?

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