Isro Electronics Lengthy Quiz 1-26/07/2020
59 Questions
| Total Attempts: 84
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/R (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) R 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) IB / IE (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 C (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 C (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
Questions: 10 | Attempts: 308 | Last updated: Aug 19, 2019
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