2-marks question bank UNIT I - TRANSFORMERS UNIT II: AC MACHINES
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1 2-marks question bank UNIT I - TRANSFORMERS 1. What is all day efficiency? 2. What are the applications of auto transformers? 3. Why transformer rating is expressed in KVA? 4. Does transformer draw any current when secondary is open? Why? 5. Define voltage regulation of a transformer. 6. Write down the condition for maximum efficiency of a transformer. 7. Classify the transformer according to the construction. 8. What are the advantages of three phase transformer 9. Write own the emf equation of a transformer 10. Differentiate between core type and shell type transformer. 11. What are the limitations of a auto transformer? 12. How to eliminate eddy current and hysteresis loss? UNIT II: AC MACHINES 1. What are the types of three phase induction motor? 2. What is the principle of operation of three Phase Induction Motor? 3. What is RMF? 4. What is slip & Percentage Slip? 5. List the differences between Squirrel Cage & Slip Ring Induction Motors? 6. Define step angle. 7. What are the Speed controls Methods of 3phase Induction Motor? 8. What are the types of starters? 9. State the applications of stepper motor. 10. State the types of stepper motor 11. What are the losses in induction motor? 12. What are different parts of a 3 phase induction motor?
2 UNIT III ALTERNATORS 1. What do you mean by the salient-pole type rotor? 2. Define voltage regulation of an alternator: 3. Compare salient pole rotor &smooth cylindrical rotor 4. Write down the equation for frequency of emf induced in an Altenator. 5. How are alternators classified? 6. What are the advantages of salient pole type construction used for Synchronous machines? 7. What is meant by armature reaction in Alternators? 8. What do you mean by synchronous reactance? 9. What is meant by synchronous impedance of an Alternator? 10. What is meant by load angle of an Alternator? 11. Name the various methods for predetermining the voltage regulation of 3-phase Alternator. 12. List the factors that affect the load sharing in parallel operating generators. 13. What are the losses in an alternator. 14. What are the main parts of an alternator. 15. Write the emf equation of an alternator UNIT IV- ELECTRONICS 1. Define CMRR. 2. Mention the electrical characteristics of IDEAL OPAMP. 3. What is meant by filter? 4. What is low pass & high pass filters? 5. Write the expression for first order low pass filter? 6. Write the expression for second order high pass filter? 7. Define slew rate. 8. Define slew rate. 9. What is band pass & band reject filter? 10. Mention some of the linear applications of OPAMP?
3 UNIT V 1. What do you mean by monostable multivibrator? 2. List the applications of 555 timer in monostable mode of operation. 3. What is a de-multiplexer? 4. List any two advantages of IC s. 5. List any two applications of multiplexes. 6. What is a multivibrator? 7. Write the applications of BCD counters. 8. Draw the pin diagram of 555 IC. 9. List the applications of counters. 10. State any two application of flip flop...
4 11 marks Unit I TRANSFORMERS 1. Obtain the approximate equivalent circuit of a given 200/2000 V, single-phase 25kVA transformer having the following test results. O.C test : 200V, 6A, 350 W on LV side S.C. test: 70V, 15A, 600W on HV side 2. A 20kVA, single phase transformer has 200 turns in the primary and 40 turns in the secondary. The primary is connected to 1000V, 50Hz supply. Determine a) The secondary voltage on open circuit b) The current flowing through the two windings on full load. c) The maximum value of flux. 3. Explain the principle of operation of an auto transformer. Also write advantages and disadvantages of auto transformer. 4. Derive the emf equation of a transformer. 5. A) Derive the equivalent circuit of a transformer. State the assumptions made. B) draw and explain the phasor diagram of a transformer on load.. 6. Explain the open circuit and short circuit tests on transformer to calculate the efficiency of a transformer? What are the advantages of these tests. 7. Derive the condition for maximum efficiency of a transformer. Unit II AC MACHINES 1. With neat sketches explain the constructional details and operation of three phase induction motor. 2. Discuss the various schemes used for speed control of 3 phase induction motor. 3. Explain in detail the starting methods of three phase induction motor with diagrams. 4. Explain double-field revolving theory. How to make the single phase induction motor self starting by overcoming this drawback? 5. Explain the construction and working of AC series motor. 6. Write briefly about stepper motor. 7. Explain why the single phase induction motors are not self starting? Describe the operation of single phase induction motors in detail.
5 Unit III ALTERNATORS 1. Explain the construction and operation of an alternator. 2. Explain in detail with phasor diagram of an alternator on load and no load. 3. Describe the parallel operation of alternators. 4. Explain the emf method of predetermining the voltage regulation of an alternator, with neat diagrams. 5. A 1200 kva, 6600 V 3 ph star connected alternator has its armature resistance as 0.25ohm per phase and its synchronous reactance as 5 ohm per phase. Calculate its regulation if it delivers full load at 0.8 pf lagging. 6. What is armature reaction? How power factor of the load affects the armature reaction? Unit IV ELECTRONICS 1. Write short notes on Adder-subtractor. 2. Write short notes on Integrator- differentiator 3. Explain the analysis of inverting amplifier and non inverting amplifier. 4. Draw and explain the operation of instrumentation amplifier. 5. Discuss the first order low pass filter and high pass filter using op-amp. 6. Explain in detail about V to I converter. Unit V 1. Explain the operation of monostable multivibrator. 2. Explain in detail about the astable multivibrator. 3. Explain the operation of a 3 bit binary ripple counter using JK flip flop 4. Draw and explain the operation and truth table of UP-DOWN counter. 5. Describe in detail the advantages of ICs and with a neat diagram give the pin configurations of 555 IC. 6. Draw and explain the operation multiplexer and demultiplexer.
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