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Electrical Engineering Practice Questions
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Electrical Engineering Practice Questions
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1. Which one of thefollowing type of negativefeedback increases the inputresistance and decreases theoutput resistance of anamplifier.
2. 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
3. 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
4. A 4-point starter is usedto start and control the speedof a
5. A C.R.O. is operated withX and Y settings of 0.5mV/cm and 100 mV/cm. Thescreen of the C.R.O. is 10 cm× 8 cm (X and Y). A sine waveof frequency 200 Hz andr.m.s. amplitude of 300 mV isapplied to the Y-input. Thescreen will show
6. The starting current of a3I induction motor is 5 timesthe rated current - while therated slip is 4%. The ratio ofstarting torque to full-loadtorque is
7. The correct sequence ofthe following devices in theincreasing order of turn-offtimes is
8. For a parallel RLCresonant circuit - the dampedfrequency is √8r/ s andbandwidth is 2r/s. What is itsresonant frequency?
9. What is the surgeimpedance loading of alossless 400 kV - 3-phase - 50Hz overhead line of average ofsurge impedance of 400ohms?
10. A dual trace oscilloscopeoperating at a slip s - the ratioof gross power output to airgap power is equal to
11. The bridge methodcommonly used for findingmutual inductance is
12. The total number of SCRsconducting simultaneously ina 3 phase full wave converterwith overlap considered hasthe sequence of
13. Which of the followingbridges can be used forinductance measurement?1. Maxwell-Ÿs bridge2. Schering bridge3. Wein-bridge4. Hay-Ÿs bridge5. Wheatstone bridge Selectthe correct answer using thecodes given below
14. The concept of anelectrically short - medium - and long line is primarilybased on the
15. Which of the followingcannot be the Fourier seriesexpansion of a periodicsignal?
16. If two 8-pole dc machinesof identical armature arewound - one with lap windingand the other with wavewinding - then
17. 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
18. A negative sequence relayis commonly used to protect
19. 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
20. A three-phase - three-stack - variable reluctance stepmotor has 20 poles on eachrotor and stator stack. Thestep angle of the step motor is
21. 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:
22. A junction FET can be
23. In a biased differentialrelay - the bias is defined as aratio of
24. Electrostatic instrumentsare normally used for
25. Use of a reverseconducting thyristor in placeof antiparallel combination ofthyristor and feedback diodein a inverter

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