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Electrical Engineering Practice Questions
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Electrical Engineering Practice Questions
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1. One Kilowatt hour ofelectrical energy is the sameas
2. If two 8-pole dc machinesof identical armature arewound - one with lap windingand the other with wavewinding - then
3. 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
4. Electrostatic instrumentsare normally used for
5. The brush-axis of abipolar dc motor is rotated by90°. The effect of this rotationon the back emf Eb and thetorque developed Td would besuch that
6. The two inputs of a CROinduction motor is
7. Keeping in view the costand overall effectiveness - thefollowing circuit breaker isbest suited for capacitor bankswitching
8. The introduction ofinterpoles in between themain poles improves the
9. In a single-phase powerfactor meter - the controllingtorque is
10. In a 3-phase slip-ringinduction motor - 3-phasebalanced supply is given tothe rotor and stator winding isshortcircuited. The rotorwould
11. Which one of thefollowing statements is notcorrect for the use of bundledconductors in transmissionlines?
12. The discrete time systemdescribed by y(n) = x2(n) is
13. A series RLC circuitresonance at 1 MHz atfrequency of 1.1 MHz thecircuit impedance is
14. A 3-phase synchronousmotor is operating at a loadangle 20° and with voltageequal to applied voltage. Thesynchronous reactance dropis set to operate in thealternate mode. The controlinput of the multiplexer usedin the ycircuit is fed with asignal having a frequencyequal to
15. When a thyristor isnegatively biased.
16. The introduction ofinterpoles in between themain poles improves theperformance of a dc machine - because
17. In normal dc machinesoperating at full-loadconditions - the most powerfulelectromagnet is
18. Which one of thefollowing systems describedby the following input-outputrelations is non-linear?
19. Which one of thefollowing statements is notcorrect for the use of bundledconductors in transmissionlines?
20. When the horizontaldeflecting plates of a CRO arekept -at the ground potentialand 30 V dc is applied to thevertical deflecting plates - thebright spot moves 1 cm awayfrom the centre. If with thesame setting - a 30 V ac isapplied to the verticaldeflecting plates - then thepicture observed on thescreen would be
21. 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
22. For eliminating nthharmonic from the emfgenerated in the phase of a 3phase alternator - the chordingangle should be
23. A three-phase - salientpole synchronous motor isconnected to an infinite bus.It is operated at no load atnormal excitation. The fieldexcitation of the motor is firstreduced to zero and thenincreased in the reversedirection gradually. Then thearmature current
24. The discrete time systemdescribed by y(n) = x2(n) is
25. In a conventional reverseblocking thyristor

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