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Electrical Engineering Practice Questions
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Electrical Engineering Practice Questions
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1. The impulse response of acausal linear time-invariantsystem is given as h(t). Nowconsider the following twostatements: Statement (I):Principle of superpositionholds. Statement (II): h(t) = 0for t < 0 Which one of thefollowing statements iscorrect?
2. If in a short transmissionline - resistance andinductance are found to beequal and regulation appearsto be zero - then the load will
3. In a 3-phase slip-ringinduction motor - 3-phasebalanced supply is given tothe rotor and stator winding isshortcircuited. The rotorwould
4. The pitch factor - inrotating electrical machinery - is defined as the ratio ofresultant emf of a
5. For eliminating nthharmonic from the emfgenerated in the phase of a 3phase alternator - the chordingangle should be
6. Consider the followingstatements:1. Equivalent-T circuit of along line is preferred toequivalent-S circuit.2. The nature of reactivepower compensation isdifferent for peak load and offpeak load conditions.3. Ferranti effect is significantonly on medium and longlines. Which of the statementsgiven above are correct?
7. In the CMOS inverter - thepower dissipation is
8. In electrodynamometertype wattmeter - theinductance of pressure coilproduces error. The error is
9. Ohm's law is notapplicable to:
10. Match List I with List IIand select the correct answerusing the code given below thelists: List - I List - II A.Transient stability1. Incremental transmissionimprovement loss B.Economic dispatch2. Area control error C. Loadfrequency control3. Power system stabilizers D.Dynamic stability4. Turbine fast valving Codes:ABCD
11. In calibration of adynamometer Wattmeter bypotentiometer - phantomloading arrangement is usedbecause
12. 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:
13. An induction motorhaving 8 poles runs at 727.5rpm. If the supply frequencyis 50 Hz - the emf in the rotorwill have a frequency of
14. The input x(t) and outputy(t) of a system are related asy(t) = ()cos (3) t X d f W WW ³.The system is
15. For a single phase
16. The output Y of a 2-bitfor which the output is logic1 - is
17. Out of the following plantcategories (i) Nuclear (ii) Runof-river (iii) Pump Storage (iv)Diesel the base load powerplants are
18. The introduction ofinterpoles in between themain poles improves theperformance of a dc machine - because
19. The Q-meter works on theprinciple of
20. If two 8-pole dc machinesof identical armature arewound - one with lap windingand the other with wavewinding - then
21. If the numerator of asecond-order transfer functionF(s) is a constant - then thefilter is atransmission line having asending end voltage V - thereal power loss will beproportional to
22. A dual trace oscilloscopeoperating at a slip s - the ratioof gross power output to airgap power is equal to
23. The pitch factor - inrotating electrical machinery - is defined as the ratio ofresultant emf of a
24. Which one of thefollowing systems describedby the following input-outputrelations is non-linear?
25. A junction FET can beused as a voltage variableresistor

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