Isro Electronics Lengthy Quiz 1-26/07/2020

59 Questions | Total Attempts: 84

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Isro Electronics Lengthy Quiz 1-26/07/2020

Total 60 questions 1 hour 30 minutes duration Complete electronics syllabus Comment about the questions and pattern


Questions and Answers
  • 1. 
    Time constant of a series R-L circuit is given by (A) LR (B) L/   (C) L2R (D) LR2
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 2. 
    The Q factor of a series RLC increases if (A) decreases    (B) R increase (C) impedance increases (D) voltage increases
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 3. 
    Which of the following is an active device ? (A) Transformer (B) Silicon controlled rectifier     (C) Electron bulb (D) Loud-speaker.
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 4. 
    Which of the following is donor impurity element ? (A) Aluminium (B) Boron (C) Phosphorus    (D) Indium
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 5. 
    Free electrons exist in (A) first band (B) second band (C) third band (D) conduction band
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 6. 
    The forbidden energy gap for silicon is (A) 0.12 eV (B) 1.12 eV (C) 0.72 eV    (D) 0.92 eV
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 7. 
    The intrinsic carrier density of a Si specimen at K is (A) 278 * 1011 cm-3      (B) 2.78 * 109 cm3 (C) 2.78 * 10-2 cm3 (D) 2.78 * 1019 cm3
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 8. 
    Which of the following transistor is affected by static electricity ? (A) NPN transistor (B) FET (C) UJT (D) MOSFET    
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 9. 
    The current amplification factor (a) is given by (A) IC IE     (B) IC IS (C) IIE (D) IB IC
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 10. 
    Number of PN junctions in JFET are (A) 0 (B) 1 (C) 2    (D) 3
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 11. 
    Number of h parameters of a transistors are (A) 1 (B) 2 (C) 3 (D) 4 
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 12. 
    An op-amp when used as a notch filter has a notch frequency = 2kHz, low frequency point = 2.2 kHz. The Q of the notch is (A) 0.5 (B) 5    (C) 0.2 (D) 2
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 13. 
    In which of the following applications vacuum tubes are still being used ? (A) public address system (B) radio receivers (C) radio transmitters     (D) electroplating plants
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 14. 
    A Wein bridge oscillator has R1 = R2 = 220 k? and C1 = C2 = 250 pF.  The frequency of oscillations will be nearly (A) 0.89 kHz (B) 1.89 kHz (C) 2.89 kHz    (D) 3.89 kHz
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 15. 
    Transistors have not replaced vacuum tubes because (A) transistors are non-linear (B) transistors do not have grid (C) high power transistors are not available     (D) heat dissipation from transistors is difficult
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 16. 
    Demodulation (A) is performed at the transmitting station (B) removes side bands (C) rectifies modulated signal (D) is opposite of modulation
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 17. 
    A frequency multiplier stage should operate as (A) Class A (B) Class B (C) Class     (D) Either of the above
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 18. 
     A frequency multiplier stage should operate as (A) Class A (B) Class B (C) Class     (D) Either of the above
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 19. 
    Pulse modulation is used in (A) radio navigation (B) automatic landing equipment (C) data communication (D) all of the above     
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 20. 
    Which of the following modulating system is digital ? (A) PPM (B) PWM (C) PCM     (D) PEM
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 21. 
    The balanced modulator circuit uses - (A) two identical diodes (B) two identical triodes    (C) two diodes with different V-I characteristics (D) two triodes with different V-I characteristics
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 22. 
    To observe a portion of a wave form we must use (A) free-running oscilloscope (B) triggered-sweep oscilloscope     (C) vector scope (D) cathode ray tube
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 23. 
    An oscilloscope is generally used to measure the value of (A) dc voltage (B) rms, ac voltage (C) peak to peak ac voltage      (D) average value of ac voltage
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 24. 
    Which one do you like?
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 25. 
     The purpose of a syne control in an oscilloscope is to (A) set the intensity level (B) control brightness (C) set the focus (D) lock the signal      
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

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