22043-ELECTRICAL DRIVES & CONTROL IMPORTANT QUESTIONS

DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

22043-ELECTRICAL DRIVES & CONTROL

STAFF-IN-CHARGE: N.DILLI BABU

IMPORTANT QUESTIONS

UNIT-I

PART-A

1)     What is meant by resistance? What is  unit  [OCT 2009/OCT 2013]

2)     What is reluctance [APR 2009]

3)     What is function of commutator? [OCT 2009]

4)     State the different type of D.C generator? [APR 2010]

5)     Define current. state it’s unit  [APR 2011]

6)     Define magnetic flux [APR 2011]

7)     Define  MMF [OCT2011/OCT2013]

8)     What is function of D.C motor? [OCT 2011]

9)     If R₁ & R₂  are connected in series , what is the  equivalent resistance ? [OCT 2013]

10) Mention the four terminals of a four point starter. [OCT 2013]

PART-B

1)     With the neat sketches , explain the constructional details of a D.C generator.

                                                                                                            [APR 2009/APR 2011/OCT  2011]

2)     With the neat sketches , explain the constructional details of a D.C motor

                                                                                                                [APR 2010/APR 2011/OCT 2013]

3)     Explain 3 point starter with neat sketch   [ OCT 2009/APR  2011]

4)      Problem:1-15 (pg.no-1.20) [APR2005]

5)     Problem :1-14(pg.no-1.18) [OCT2011]

6)     Explain 4 point starter with neat sketch

PART-C [4 MARK’S]

1)     State faraday’s law of electromagnetic induction[APR 2009/OCT 2011/APR 2011/OCT 2013]

2)     Problem :1-13(pg.no- 1-17) [APR 2004]

3)     What are the causes of voltage drop in D.C generator? [APR 2011]

4)     List the applications of different types D.C motor [APR 2011]

5)     Draw the neat diagram of a 4 point starter [OCT 2011]

6)     When two resistance R₁,R₂ are connected in series the total resistance is R_S=18   and when they are connected parallel the total resistance R_P=4 . Find R₁ and ,R₂ [OCT 2013]

UNIT-II

PART-A

1)     Write is relation b/w the line voltage and phase voltage & line current and phase current in star and delta connected system [oct-2009]

2)     Define power in single phase circuit. state its formula  [apr-2010]

3)      What are main parts of a transformer? [apr-2010]

4)     State the applications of capacitor start induction motor [apr-2010]

5)     Write the types of starter – induction motor [apr-2011]

6)     State  the application of induction motor [apr-2011]

7)     Write the emf equation of a transformer. [oct-2011/apr-2013]]

8)     What is the working principle of induction motor? [oct-2011]

9)     What is meant by average value? [apr-2013]

10)Define the term phase voltage. [apr-2013]

11)Name the types of three phase induction motor [apr-2013]

12)What is RMS value? [oct-2013]

13)Define term line voltage. [oct-2013]

14)What are the losses in a transformer? [oct-2013]

15)What are different speed control methods of induction motor? [oct-2013]

PART-B

1)    Explain the principle and operation of capacitor start induction motor. [apr-2009]

2)    Explain the construction and operation of D.O.L starter [apr-2009/oct-2011/oct-2013]

3)      Explain the construction and operation of star-delta starter [ oct-2009]

4)     Explain different methods of speed control of three phase induction motor.[apr-2010]

5)    Explain the construction of transformer.[apr-2010/apr-2013]

6)     Explain the working of squirrel cage  three induction motor. [apr-2010]

7)     State the losses in the transformer and explain it. [apr-2011]

8)    Explain the constructional features of an alternator with suitable diagram. [oct-2011]

9)     Explain the principle and operation of 3 phase induction motor [apr-2013]

10)Explain the constructional details of salient pole alternator with neat sketches. [oct-2013]

UNIT-III

PART-A

1)     State any two application of stepper motor (oct-2011/apr-2013)

2)     What is meant by energy conservation?(apr-2011)

3)     Name  the  types of servomotor.(apr-2013)

4)     Mention the different types of electrical drives.(apr-2013)

5)     What is electrical shock?(aor-2013)

6)     What is step angle?(oct-2013)

7)     What is meant by servo mechanism?(oct-2013)

8)     What are the parts of electric drive?(oct-2013)

9)     Mention the types of earthing.(oct-2013)

10) What is individual drive?

11) What is half stepping?

12) Write one precaution of avoid electric shock.

13) What is group drive?

PART-B                                                                                                             

1)     Explain the construction and working of a stepper motor (april-2011/oct-2011/apr-2013)

2)     State the causes of accidents and their preventive measures in industry (april-2011)

3)     Explain half stepping switching sequence of stepper motor with neat diagram and with switching table(oct-2013)

4)     (i)  List out the precautions to be taken to avoid electric shock.

(ii)  write the short notes energy conservation.(oct-2013)

5)     Write the importance of earthing.

6)     PMDC & SERVO –motor(apr-2013)

7)     What is meant by industrial drives . list the types and explain any two in details

UNIT-IV

PART-A

1)     What is positive logic(apr-2011/apr-2013)

2)     Write the Boolean expression for two input NAND gate.(oct-2011)

3)     What is rectifier?(oct-2013)

4)     Identify and name the terminals  of a diode.(oct-2013)

5)     Mention the types of SMPS(oct-2013)

6)     What is negative logic?(oct-2013)

7)     What is diode& draw the symbol.(apr-2013)

8)     What is inverter?(apr-2013)

9)     What is forward biasing?

10) State any two application of SMPS.

11) Why do you want need filter in rectifier?

12) Expand SMPS & UPS

PART-B

1)     With diagram explain forward biasing and reverse biasing of PN junction diode & V-I characteristics(apr-2011/oct-2013)

2)     Explain the working of  half & full wave rectifier with a need diagram. Also draw its input and output waveforms.(oct-2011/apr-2013)

3)     (i) Write short notes on seven segment LED.

(ii)   Draw the symbol and write the truth table of NOR, EX-OR and NAND gates(oct-2013)

4)     Draw the symbols and write the truth tables of OR, AND, NOT, NAND & NOR gates.(apr-2013)

5)     Write the short notes on LCD & LED

6)     Write short notes on SMPS,UPS & INVERTER

7)     Necessity of filters

UNIT-V

PART-A

1)     Name any two input elements used in PLC system.(apr-2011/apr-2013)

2)     State any two application of PLC.(apr-2011)

3)     What are the features of PLC?(OCT-2011)

4)     Draw the ladder diagram for obtaining AND logic.(oct-2011)

5)     What is meant by fuse?(apr-2013)

6)     Mention any two types of sensors.(apr-2013)

7)     Expand ELCB.(apr-2013)

8)     List the types of fuse.(oct-2013)

9)     Draw the symbol of NO & NC contacts.(OCT-2013)

10) What is a circuit breaker?(oct-2013)

11) List any two advantages of PLC.(oct-2013)

12) Expand MCCB, MCB, OCB.

PART-B

1)     Explain (i) Limit switch,  (ii) Reed switch, (iii)Pressure switch & (iv)Float switch (apr-2011/2013)

2)     Design a ladder diagram for operation of motor using AND & OR logic.(apr-2011)

3)     Describe about input, output elements and memory system of a PLC.(OCT-2011)

4)     (i) Draw a neat sketch of solenoid type contactor.

(ii) List the advantages of PLC. (APR-2013)

5)     Explain the construction and working of ELCB with a neat diagram.(oct-2013)

6)     Draw and explain the block diagram of PLC. (OCT-2013)

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