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## 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

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

For more questions please download the above Pdf file

**UNIT-II**

D.C. Generators & Armature Reaction

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

For more questions please download the above Pdf file

**UNIT-III**

Types of D.C Generators & Load Characteristics

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

For more questions please download the above Pdf file

**UNIT-1V**

D.C. Motors & Speed Control Methods

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

For more questions please download the above Pdf file

**UNIT-V**

Testing of D.C. Machines

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

For more questions please download the above Pdf file