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  • Question

  • The current rating of a cable depends on


  • Options
  • A. length of cable
  • B. diameter of cable
  • C. both length and diameter of cable
  • D. none of the above

  • Correct Answer
  • diameter of cable 

    Explanation
    Current rating depends only on area of cross-section and hence diameter.

    More questions

    • 1. If the frequency is less than the damped frequency in a series- inverter

    • Options
    • A. the distortion of output voltage waveform is low
    • B. the distortion of output voltage waveform is high
    • C. the distortion of output voltage may be high or low depending on the load impedance
    • D. none of the above
      • Discuss
    • 2. In a series inverter

    • Options
    • A. the commutating elements L and C are in parallel
    • B. the commutating elements L and C are in series with load
    • C. the commutating L and C may be in series or parallel with the load
    • D. none of the above
      • Discuss
    • 3. In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current

    • Options
    • A. are always similar
    • B. can never be similar
    • C. may be similar or dissimilar
    • D. are similar only if a = 0
      • Discuss
    • 4. A 200 turn coil has a self inductance of 10 mH. If the number of turns is doubled, all other quantities remaining the same, the self inductance will be

    • Options
    • A. 2.5 mH
    • B. 5 mH
    • C. 20 mH
    • D. 40 mH
      • Discuss
    • 5. A fully controlled bridge converter is feeding an RLE load. For some circuit conditions firing angle is 47°. If connections of battery are reversed, the firing angle is likely to be

    • Options
    • A. 47°
    • B. less than 47°
    • C. more than 47°
    • D. either more or less than 47°
      • Discuss
    • 6. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls find cut off wavelength for dominant mode.

    • Options
    • A. 4 cm
    • B. 1 cm
    • C. 2 cm
    • D. 8 cm
      • Discuss
    • 7. Half bridge and full bridge inverters of one type use different commutation methods.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A colour television signal having bandwidth of 4.6 MHz is digitised using 10 bits sample. The digital bit rate used for its transmission with PCM would be __________ kilobits/second.

    • Options
    • A. 92000
    • B. 920
    • C. 23000
    • D. 230
      • Discuss
    • 9. The snubber circuit consists of

    • Options
    • A. a capacitor connected in series with thyristor
    • B. a capacitor connected in parallel with thyristor
    • C. a resistor and capacitor in series connected across thyristor
    • D. none of the above
      • Discuss
    • 10. When a single phase dual converter is operating in circulating current mode

    • Options
    • A. both converters are working as rectifiers simultaneously
    • B. one converter is always working as rectifier and the other as inverter
    • C. only one converter is working at one time
    • D. both converters are either working as rectifiers or as inverters simultaneously
      • Discuss

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