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Electrical Engineering Practice Questions
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Electrical Engineering Practice Questions
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1. A 4-point starter is used tostart and control the speed ofa
2. The total number of SCRsconducting simultaneously ina 3 phase full wave converterwith overlap considered hasthe sequence of
3. For a 500 Hz frequencyexcitation - a 50 km longpower line will be modelled as
4. The slip of an inductionmotor normally does notdepend on
5. A junction FET can beused as a voltage variableresistor
6. A sinusoidal waveform - when observed on anoscilloscope - has peak-to-peakamplitude of 6 cm. If thevertical sensitivity setting is 5V/cm - the rms value of thevoltage will be
7. One Kilowatt hour isequal to
8. When a junction diode isused in switchingapplications - the forwardrecovery time is
9. Specific resistance of asubstance is measured in:
10. Consider the followingstatements. The overlap angleof a phase-controlledconverter would increase onincreasing the1. supply voltage.2. supply frequency3. load current4. source inductance. Ofthese statements
11. Which one of the followingsystems described by thefollowing input-outputrelations is non-linear?
12. The accuracy of Kelvin-Ÿsdouble bridge for themeasurement of lowresistance is high because thebridge
13. An uncharged metal ballis placed in the uniformelectric field of a planecapacitor. Which of themcorrectly represents the fieldlines on the ball?
14. In dc machines - thearmature windings are placedon the rotor because of thenecessity for
15. The introduction ofinterpoles in between themain poles improves theperformance of a dc machine - because
16. In dc chopper - thewaveform for
17. A set of independentcurrent measurements takenby four observers wasrecorded as: 117.02 mA - 117.11 mA - 117.08 mA and117.03 mA. What is the rangeof error?
18. A chopper operating at afixed frequency is feeding anR-L load. As - the duty ratio ofthe chopper is increased from25°h to 75°h - the ripple in theload current
19. The conductor of a 10 kmlong - single phase - two wireline are separated by adistance of 1.5 m. Thediameter of each conductor is1 cm. If the conductors are ofcopper - the inductance of thecircuit is
20. Kirchoff-Ÿs first law - i.e. - S i= 0 at a junction - deals withthe conservation of
21. A surge of 100 kV travelsalong an overhead linetowards its junction with acable. The surge impedancefor the overhead line andcable are 400 ohms and 50ohms respectively. Themagnitude of the surgetransmitted through the cableis
22. A system with input x(t)and output y(t) is defined bythe input-output relation 2 ()() t yt x d f WW ³ The systemwill be
23. A dc shunt generator hasfull-load voltage regulation of10% at rated speed of 1000rpm. If it is now driven at1250 rpm - then its voltageregulation at full load would
24. In the statement -œtheelectrically short - medium - and long line is primarilybased on the
25. In dc chopper - thewaveform for

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