1. Electrostatic instrumentsare normally used for

2. Generally the no-loadlosses of an electrical machineis represented in itsequivalent circuit by a

3. An UJT exhibits negativeresistance region

4. A 4-point starter is usedto start and control the speedof a

5. The principal informationobtained from load flowstudies in a power system are1. magnitude and phaseangle of the voltage at eachbus2. reactive and real powerflows in each of the lines3. total power loss in thenetwork4. transient stability limit ofthe system Select the correctanswer using the codes givenbelow:

6. In dc machines - thearmature windings are placedon the rotor because of thenecessity for

7. Six MOSFETs connectedin a bridge configuration(having no other power device)MUST be operated as aVoltage Source Inverter (VSI).This statement is

8. In a conventional reverseblocking thyristor

9. What is the surgeimpedance loading of alossless 400 kV - 3-phase - 50Hz overhead line of average ofsurge impedance of 400ohms?

10. The impulse response ofan R-“L circuit is a

11. A cascade of threeidentical modulo-5 countershas an overall modulus of

12. Consider the followingstatements about SCR1. For normal SCRs. turn-ontime is more than turn-offtime.2. a forward voltage can beapplied to on SCR after itsgate recovery time.3. Static V-I characteristics ofan SCR with different gatedrives applied to the gate areindicated by Vgl > Vgl > VgoWhich of the following iscorrect?

13. Consider the followingstatements related to a CMOS(Complementary metal oxidesemiconductor) inverter:1. It combines an n-channeland a p-channel MOStransistor.2. For binary 1 input - bothtransistors are OFF.3. For binary 0 input - bothtransistors are ON.4. Whatever is the state ofinput - one transistor is ONwhile the other is OFF. Whichof the statements given aboveare correct?

14. A 4-point starter is used tostart and control the speed ofa

15. The pressure coil of adynamometer type wattmeteris

16. Consider the followingstatements: An SCR - from itsOFF state - can be made ON by1. increasing its anodevoltage2. increasing its gate current3. decreasing its gate voltage4. decreasing its anodecurrent Which of thestatements given above arecorrect?

17. If two 8-pole dc machinesof identical armature arewound - one with lap windingand the other with wavewinding - then

18. If a travelling-wavetravelling along a loss-freeoverhead line does not resultin any reflection after it hasreached the far end - then thefar end of the line is

19. Two charges are at adistance d apart. If a copperplate (conducting medium) ofthickness 2 d is placedbetween them - the effectiveforce will be

20. Consider the followingstatements: (i) Thecompensating coil of a lowpower factor wattmetercompensates the effect of theimpedance of the current coil.(ii) The compensating coil of alow power factor wattmetercompensates the effect of theimpedance of the voltage coilcircuit.

21. In calibration of adynamometer Wattmeter bypotentiometer - phantomloading arrangement is usedbecause

22. An analog voltmeter usesexternal multiplier setting.With a multiplier setting of 20k: - it reads 440 V and with amultiplier setting of 80 k: - itreads 352 V. For a multipliersetting of 40 k: - the voltmeterreads

23. The two inputs of a CROare fed with two stationaryperiodic signals. In the X-Ymode - the screen shows afigure which changes fromellipse to circle and back toellipse with its major axischanging orientation slowlyand repeatedly. Which of thefollowing inference can bemade from this?

24. Which of the followingfactors improve commutationin a dc machine?1. High contact resistance ofbrushes2. High inductance of the coilsundergoing commutation3. Shifting of brushes in thedirection of rotation for agenerator and in the oppositedirection for motor4. Narrow width for thecommutation bars Select thecorrect answer using thecodes given below: Codes:

25. Consider the followingstatements: The use ofinterpoles in dc machines is tocounteract the1. reactance voltagetransmission in a long EHVtransmission line - the mostpreferred method is to connecta