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Home Electronics and Communication Engineering Exam Questions Papers See What Others Are Saying!
  • Question
  • The gradient of any scalar field always yields __________ .


  • Options
  • A. a solenoidal field
  • B. a conservative field
  • C. an irrotational field
  • D. none of these

  • Correct Answer
  • a conservative field 

    Explanation
    Dot product is conservative. Gradient is nothing but dot product.

    More questions

    • 1. In 8 cavity magnetron the p mode corresponds to a total phase shift equal to

    • Options
    • A. ± 8 p radians around the periphery
    • B. ± 4 p radians around the periphery
    • C. ± 2 p radians around the periphery
    • D. ± 16 p radians around the periphery
    • Discuss
    • 2. Match the following:

      List I (DOS commands) List II (Meaning)
      A. DBLSPACE 1. Deletes a director and its sub-directories
      B. MEM 2. Displays the amount of used and free memory
      C. SYS 3. Put a copy of DOS on disk
      D. DELTREE 4. Compresses files to increase the storage capacity of disc


    • Options
    • A. A-4, B-3, C-2, D-1
    • B. A-2, B-3, C-4, D-1
    • C. A-4, B-2, C-3, D-1
    • D. A-1, B-2, C-3, D-4
    • Discuss
    • 3. In a 3 phase fully controlled converter the firing frequency is

    • Options
    • A. 3 times the line frequency
    • B. 6 times the line frequency
    • C. 9 times the line frequency
    • D. 12 times the line frequency
    • Discuss
    • 4. Assertion (A): The output voltage of an inverter can be controlled by PWM technique

      Reason (R): In a current source inverter the input current is constant.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R correct but R is not correct explanation of A
    • C. A is correct but R is wrong
    • D. A is wrong but R is correct
    • Discuss
    • 5. Assertion (A): Doping level in extrinsic semiconductors is very small.

      Reason (R): Additional of impurity in the ratio of 1 part in 108 parts increases the number of charge carriers by about 20.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
    • Discuss
    • 6. Which part of radio spectrum is more crowded?

    • Options
    • A. Lower frequency part
    • B. Higher frequency part
    • C. Both (a) and (b)
    • D. None of these
    • Discuss
    • 7. For satellite transmission, analog signals may be converted into digital form with the help of

    • Options
    • A. modem
    • B. transponder
    • C. codec
    • D. compandor
    • Discuss
    • 8. Assertion (A): Bolometer is frequently used in microwave power measurement.

      Reason (R): In a bolometer the input microwave power causes a change in resistance.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R are correct but R is not correct explanation of A
    • C. A is correct but R is wrong
    • D. A is wrong but R is correct
    • Discuss
    • 9. Assertion (A): An ideal rectifier should have unity harmonic factor

      Reason (R): An ideal rectifier should have unity displacement factor.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R correct but R is not correct explanation of A
    • C. A is correct but R is wrong
    • D. A is wrong but R is correct
    • Discuss
    • 10. Assertion (A): Power transistor has lower switching time than SCR

      Reason (R): Power transistor has greater switching time than SCR


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R correct but R is not correct explanation of A
    • C. A is correct but R is wrong
    • D. A is wrong but R is correct
    • Discuss


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