logo

CuriousTab

CuriousTab

Discussion


Home Electronics and Communication Engineering Radio Receivers See What Others Are Saying!
  • Question
  • In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be


  • Options
  • A. 1655 kHz
  • B. 2110 kHz
  • C. 745 kHz
  • D. 910 kHz

  • Correct Answer
  • 2110 kHz 

    Explanation
    A signal (image) can interfere with a superheterodyne receiver if fits the following equation.

    Image = Signal +/- 2 x I.F.

    Which says that a signal has the capacity to interfere with a superhet receiver if its frequency is equal to the signal frequency (1200 kHz in our question) plus or minus twice the IF (455 kHz in our question).

    So one possible image is: 1200 + ( 2 x 455 ) = 2110 kHz (possible).

    And the other: 1200 - ( 2 x 455 ) = 290 kHz (not likely).


    More questions

    • 1. The characteristics of which device has peak point and valley point

    • Options
    • A. SCR
    • B. PUT
    • C. SCS
    • D. Shockley diode
    • Discuss
    • 2. Schrodinger wave equation is partial differential equation.

    • Options
    • A. True
    • B. False
    • Discuss
    • 3. The output frequency of a cycloconverter can be changed by changing the firing angle.

    • Options
    • A. True
    • B. False
    • Discuss
    • 4. Most of the memory chips in static RAM

    • Options
    • A. do not require any supply
    • B. need 2 V supply
    • C. need 5 V supply
    • D. need 12 V supply
    • Discuss
    • 5. In crystalline solids, atoms are stacked in a regular manner.

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. The classes of solid dielectrics are

    • Options
    • A. A, B, C, D, E, F, H
    • B. A E B F H C D
    • C. Y A E B F H C
    • D. A E B F H C
    • Discuss
    • 7. The unit for mmf is

    • Options
    • A. A
    • B. Wb
    • C. T
    • D. V
    • Discuss
    • 8. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally

    • Options
    • A. equal
    • B. different
    • C. equal or different
    • D. different but sometimes equal
    • Discuss
    • 9. The real part of complex dielectric constant and tan? for a dielectric are 2.1 and 5 x 10-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is

    • Options
    • A. 1.05 x 10-3
    • B. 2.1 x 10-3
    • C. 5 x 10-3
    • D. 1.05 x 10-2
    • Discuss
    • 10. The units for ?r are

    • Options
    • A. Farads
    • B. Farads/m
    • C.
    • D. no units
    • Discuss


    Comments

    There are no comments.

Enter a new Comment