question bank 2010 11

8/8/2019 Question Bank 2010 11

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BIRLA INSTITUTE OF TECHNOLOGY AND SCIENCE, PILANI

K.K. BIRLA GOA CAMPUS

Laboratory Examination EMEC (EEE / INSTR C371)

Instructions to Candidates:

1. Report for examination at least 15 minutes before the schedule.2. Submit the evaluated lab report file.3. Pick up one answer book in order. The answer book is marked with your panel

number and experiment number.

4. Go to your panel with your answer book and a copy of the question bank.5. Write complete question corresponding to your experiment number on the third page

of your answer book after consulting the question bank.

6. Draw a neat circuit diagram for your experiment below the question using standardsymbols with the help of geometrical instruments. Enter all ranges / readings and

name plate details of the machine.

7. Get the circuit diagram approved by the examiner earmarked for you.8. Hook up the circuit and get the connections approved by the examiner. Note that

approval for connections guarantees safety of the equipment only.

9. Start the experiment. Get one set of observations signed by the examiner. If youforget this step, all your observations and calculations will be considered as null

and void and hence no credit for 11(c) and (d) components.

10.You are expected to complete the conduct of experiment in 90 minutes. Further 30minutes are for calculations, graph, etc.

11.Break up of marks is as follows:a) Circuit diagram 08b) Connections 08c) Performances and Observations 08d) Calculations / Results / Graphs etc. 08e) *Viva 08* No recheck possible for this component.

12.Only one change of experiment will be permitted at the cost of 50% credit.


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EEE / INSTR C371

PRACTICAL PROBLEM BANK

1) Obtain the efficiency vs. output characteristic of the given single-phase transformerwithout conducting a load test at 0.8 pf lag.

2) Obtain the efficiency vs. output characteristic of the given single-phase transformerwithout conducting a load test at 0.8 pf lead.

3) Obtain the efficiency vs. output characteristic of the given single-phase transformerwithout conducting a load test at UPF.

4) Obtain the regulation vs. load characteristic of the given single-phase transformerwithout conducting a load test at UPF.

5) Obtain the regulation vs. load characteristic of the given single-phase transformerwithout conducting a load test at 0.8 pf lag.

6) Obtain the regulation vs. load characteristic of the given single-phase transformerwithout conducting a load test at 0.707 pf lead.

7) Obtain the regulation vs. power factor characteristic of the given single-phasetransformer without conducting a load test at full-load.

8) Obtain the regulation vs. power factor characteristic of the given single-phasetransformer without conducting a load test at half-full-load.

9) Obtain the regulation vs. power factor characteristic of the given single-phasetransformer without conducting a load test at (3/4)th of full-load.

10)Predetermine the maximum efficiency of the given single-phase transformer and theload at which it occurs.

11)Obtain the circuit model of the given single-phase transformer referred to LV side.12)Obtain the circuit model of the given single-phase transformer referred to HV side.13)Predetermine the voltage across the load connected to the LV winding of the given

single phase transformer when rated current is supplied at the rated voltage to its HV

winding at 0.6 pf lag.14)Predetermine the voltage across the load connected to the HV winding of the given

single phase transformer when rated current is supplied at the rated voltage to its LV

winding at 0.8 pf lead.

15)Predetermine the voltage across the load connected to the LV winding of the givensingle phase transformer when rated current is supplied at the rated voltage to its HV

winding at UPF.

16)Obtain the field control characteristic of the given dc shunt motor on no-load at100% rated value of armature applied voltage.

17)Obtain the field control characteristic of the given dc shunt motor on no-load at90% rated value of armature applied voltage.

18)Obtain the field control characteristic of the given dc shunt motor on no-load at80% rated value of armature applied voltage.19)Obtain the armature control characteristic of the given dc shunt motor on no-load at

100% rated value of excitation.20)Obtain the armature control characteristic of the given dc shunt motor on no-load at

90% rated value of excitation.

21)Obtain the armature control characteristic of the given dc shunt motor on no-load at80% rated value of excitation.


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22)Predetermine the characteristic efficiency vs. output of the given dc shunt machine,when it is operated as a generator.

23)Predetermine the characteristic efficiency vs. output of the given dc shunt machine,when it is operated as a motor.

24)Predetermine the efficiency and line current of the given dc motor when it deliversthe rated output.25)Predetermine the efficiency and line current of the given dc motor when it delivershalf the rated output.

26)Predetermine the efficiency and load current of the given dc machine ,acting as agenerator, when it takes an input of 1.5kW

27)Predetermine the efficiency and load current of the given dc machine, acting as agenerator, when it takes an input of 2.2kW.

28)Predetermine the torque vs. output characteristic of given dc shunt motor.29)Obtain the characteristic synchronous impedance vs. field current of the given

three-phase synchronous generator.

30)Obtain the characteristic synchronous reactance vs. field current of the given 3-phase synchronous generator.31)Predetermine percentage regulation of the given 3-phase synchronous generator whenit delivers rated load at 0.8 pf lag.

32)Predetermine percentage regulation of the given 3-phase synchronous generator whenit delivers rated load at 0.8 pf lead.

33)Predetermine percentage regulation of the given 3-phase synchronous generator whenit delivers rated load at UPF.

34)Predetermine the critical resistance of the given dc shunt generator under no-load atrated speed.

35)Plot the open-circuit characteristic of the given dc shunt generator at 90% of the ratedspeed and predetermine the critical resistance of it at rated speed.



38)Predetermine the critical speed of the given dc shunt generator under no-load with afield current to produce rated voltage at the initial point.

39)Plot the induced e.m.f. vs. speed of the given dc shunt generator by setting the fieldcurrent to produce 90% of rated voltage at the initial point and predetermine the

critical speed of it at rated voltage.40)Plot the induced e.m.f. vs. speed of the given dc shunt generator by setting the field

current to produce 80% of rated voltage at the initial point and predetermine the

critical speed of it at rated voltage.41)Plot the induced e.m.f. vs. speed of the given dc shunt generator by setting the field

current to produce 70% of rated voltage at the initial point and predetermine the

critical speed of it at rated voltage.42)Obtain the external characteristic of the given dc shunt generator without conducting

a load test

43)Obtain the internal characteristic of the given dc shunt generator without conducting aload test


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44)Obtain the external characteristic of the given dc shunt generator by conducting aload test.

45)Obtain the internal characteristic of the given dc shunt generator by conducting a loadtest.

46)Conduct a suitable test on the given dc shunt generator and obtain the characteristicvoltage drop due to armature reaction vs. armature current47)Conduct Sumpners test on the given pair of single phase transformers and obtain theefficiency vs. output at 0.8 pf lag.

48)Conduct Sumpners test on the given pair of single phase transformers and obtain theefficiency vs. output at 0.8 pf lead.

49)Conduct Sumpners test on the given pair of single phase transformers and obtain theefficiency vs. output at UPF.

50)Conduct Sumpners test on the given pair of single phase transformers and obtain theregulation vs. output at UPF.

51)Conduct Sumpners test on the given pair of single phase transformers and obtain theregulation vs. output at 0.8 pf lag.

52)Conduct Sumpners test on the given pair of single phase transformers and obtain theregulation vs. output at 0.8 pf lead.

53)Conduct Sumpners test on the given pair of single phase transformers and obtain theregulation vs. output at rated load.

54)Predetermine the maximum efficiency of each of the given pair of single-phasetransformer by conducting a back-to-back test on them.

55)Obtain the circuit model of the given pair of single-phase transformers referred to LVside by conducting a back-to-back test.

56)Obtain the circuit model of the given pair of single-phase transformers referred to HVside by conducting a back-to-back test.

57)Predetermine the voltage to be applied to the LV winding of the given pair of singlephase transformers to supply rated load at rated voltage on 0.8 pf lag from the HV

winding by conducting a back to back test.58)Predetermine the voltage to be applied to the LV winding of the given pair of single

phase transformers to supply rated load at rated voltage on 0.6 pf lead from the HV

winding by conducting a back to back test.59)Predetermine the terminal voltage across the load connected to LV winding on the

given pair of single phase transformers when rated current is supplied at rated voltage

to its HV winding at 0.6 pf lag by conducting a back to back test.

60)Predetermine the terminal voltage across the load connected to HV winding on thegiven pair of single phase transformers when rated current is supplied at rated voltage

to its LV winding at 0.8 pf lead by conducting a back to back test.

61)Two independent single - phase loads of UPF are to be supplied from a two-phasesupply. Only three-phase supply is available. Make the necessary connection, conduct

a load test and obtain efficiency vs. output characteristics for the system, which

converts the three-phase supply into a two-phase supply.62)Two independent single - phase R-C loads are to be supplied from a two-phase

supply. Only three-phase supply is available. Make the necessary connection, conduct

a load test and obtain efficiency vs. output characteristics for the system, whichconverts the three-phase supply into a two-phase supply.


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63)Conduct a back-to-back test on the given pair of a dc machines and obtain theefficiency of both the machines when the generator armature supplies a current of 5

Amperes.

64)Conduct a Hopkinsons test on the given pair of a dc machines and obtain theefficiency of both the machines when the motor armature takes a current of 5

Amperes.65)Conduct a Hopkinsons test on the given pair of a dc machines both connected asshunt machines and obtain the efficiency of both the machines when the generator

armature current is 4 Amperes.

66)Conduct a Hopkinsons test on the given pair of a dc machines both connected asshunt machines and obtain the efficiency of both the machines when the motorarmature current is 7 Amperes.

67)Conduct a Hopkinsons test on the given pair of a dc machines both connected asshunt machines and obtain the efficiency of both the machines when the generatorarmature current is 3 Amperes.

68)Conduct a Hopkinsons test on the given pair of a dc machines both connected asshunt machines and obtain the efficiency of both the machines when the motorarmature current is 4 Amperes.

69)Obtain the V-curves of the given synchronous generator at any two loads.70)Obtain the inverted V-curves of the given synchronous generator at any two loads.71)Obtain the efficiency vs. output characteristic of the given three-phase induction

motor.

72)Obtain the line current vs. output characteristic of the given three-phase inductionmotor.

73)Obtain the power factor vs. output characteristic of the given three-phase inductionmotor.

74)Obtain the torque vs. line current characteristic of the given three-phase inductionmotor.

75)Predetermine the efficiency of the given three-phase induction motor at full-load byconducting the no-load and blocked-rotor at suitable values when the slip is 0.05.

76)Predetermine the efficiency of the given three-phase induction motor at half-full-loadby conducting the no-load and blocked-rotor at suitable values when the slip is 0.02.

77)Predetermine the efficiency of the given three-phase induction motor at (3/4)th ofrated load by conducting the no-load and blocked-rotor at suitable values when the

slip is 0.03.

Instructor-in-charge

EEE / INSTR C371

question bank 2010 11

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