KALVI WORLD
COMMON APTITUDE TEST - 1
MODEL QUESTION PAPER
Subject: Electrical Machines
Class: Diploma EEE
Max Marks: 100
Time: 3 Hours
GENERAL INSTRUCTIONS:
- Answer all questions in Part A (Short Answer Questions)
- Attempt any 5 questions from Part B (Descriptive Questions)
- Neat diagrams must be drawn wherever necessary
- Assume suitable data if necessary and mention it clearly
- Use of non-programmable calculator is permitted
PART A – SHORT ANSWER QUESTIONS 10 × 2 = 20 Marks
| Q.No | Question |
|---|---|
| 1. | What is a PN junction diode? |
| 2. | Define Fermi level in semiconductors. |
| 3. | State Lenz's law. |
| 4. | What is slip in an induction motor? |
| 5. | List any two applications of stepper motors. |
| 6. | Define back EMF in DC motors. |
| 7. | What is the function of a commutator? |
| 8. | State the condition for resonance in an RLC circuit. |
| 9. | What is the use of a capacitor in a single-phase motor? |
| 10. | Define efficiency of a transformer. |
PART B – DESCRIPTIVE QUESTIONS 5 × 16 = 80 Marks
| Q.No | Question |
|---|---|
| 11. |
a) With a neat diagram, explain the construction of an Induction type energy meter. b) Describe its working and applications. |
| 12. | Describe in detail the operation of a DC shunt motor with characteristics. |
| 13. |
a) Explain torque-slip characteristics of a 3-phase induction motor. b) Mention advantages and limitations of induction motors. |
| 14. | Explain with diagram the working of a single-phase transformer and its losses. |
| 15. |
a) List different types of DC generators. b) Explain the working of a DC compound generator with its characteristics. |
PART C – DESCRIPTIVE QUESTIONS 1 × 16 = 16 Marks
| Q.No | Question |
|---|---|
| 16. |
a) With a neat diagram, explain the construction of an Induction type energy meter. b) Describe its working and applications. |