EC Engineering mcqs

MCQ in Telecommunication

MCQ in Telecommunication

Q1.    Mark Cross against the correct answer:

1. Type of modulation used in visual section of a transmitter.
  1. Positive A.M.
  2. Negative A.M.
  3. F.M.
  4. None of the above.
2. The Difference between video I.F. & audio I. F in TV transmitter is
  1. 4.43 MHz
  2. 3.50 MHz
  3. 5.50 MHz
  4. None of the above.

3.Duration of vertical blanking is
  1. 4.7 m second
  2. 0.2 milli second
  3. 1.6 milli second
  4. None of the above.
4. Duration of horizontal sync pulse is
  1. 64 m second
  2. 1.6 milli second
  3. 4.7 m second
  4. None of the above.
5. I.F. at output of TV Receiver tuner for video is
  1. 38.9 MHz
  2. 33.4 MHz
  3. 40.5 MHz
  4. None of the above.
6. slotted antenna is used for
  1. VHF
  2. UHF
  3. Both VHF & UHF
  4. None of the above.
7. The PDA used for TVRO is used for
  1. Receiving signals
  2. Transmitting signals
  3. Both as (a) & (b) simultaneously
  4. None of the above.
8. Three Primary Colours in TV Transmission are
  1. Red, Green, Blue.
  2. Red, Yellow, Blue
  3. Red, Cyan, Magenta
  4. None of the above.
9. Colour Temperature of average day light is
  1. 3200 K
  2. 5600 K
  3. 6500 K
  4. None of the above.
10. Eye is more sensitive to
  1. Red
  2. Green
  3. Blue
  4. Violet

Q2.    Fill in the blanks:

  1. To receive satellite signal feed is kept at ________________ of PDA.
  2. Parking slot of Satellite PAS-4 is ______________________.
  3. The valve used in ATRPA stage of Mark-II TV Transmitter is ______.
  4. Cooling system used in High Power TV Transmitter (Mark-III) is____________________.
  5. Number of picture frames per second in CCIR PAL-B system is _____________.
  6. The frequency of colour sub-carrier in CCIR PAL-B system is _____________.
  7. TRACT stands for _______________________________________.
  8. The binary equivalent of decimal number 13 is _________________.
  9. One ton of refrigeration equals ________________ kcal/hr.
  10. Two stroke engine is _________efficient as compared to four stroke engine.
  11. FET is a ________________________ device.
  12. The maximum value of power factor in a. c. circuit is_____________________.
  13. Peak to peak value of an a.c. voltage can be measured with the help of ____________________.
  14. High VSWR at TV transmitter will cause ____________________ in picture.
  15. Series LC circuit tuned at second harmonic will have ______________ reactance at fundamental.

Answers

Telecommunication

Q1     1 (b)     2 (c)     3 (c)     4 ( c ) 5 (a)     

    6 (b)     7 (a)     8 (a)     9 (c)     10 (b).

Q2    1. Focal point        2. 68.5o E          3. 5 F 64 R

    4. Forced air     5. 25         6. 4.43 MHz

  1. Transportable Remote Area communication terminal

8. 1101         9. 3000 kcal/hr     10. Less efficient

    11. Unipolar         12. Unity         

    13. Cathode ray oscilloscope

14. Ghost        15. Capacitive.