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Monday 3 June 2013

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PUBLIC SECTOR UNDERTAKING
PSU Study Materials
Electronics & Communication Engg.
Q.1.Power diode is generally made from
  • Silicon
  • Germanium
  • Both
  • None of these
Q.2.When the both junction of NPN diode is reverse biased, then the diode is in which mode
  • Active
  • Cutoff
  • Saturation
  • inverted
Q.3.Which transistor mode gives the inverted output
  • Common Emitter
  • Common Base
  • Common Collector
  • None of these
Q.4.Which coupling gives the higher gain in case of amplifier
  • Capacitor coupling
  • Impedance coupling
  • Transformer coupling
  • None of these
Q.5.Which distortion is least objectionable in audio amplification
  • Phase
  • Frequency
  • Harmonic
  • Inter mediation
Q.6.A narrow band amplifier has a band pass nearly…………of central frequency
  • 33.3%
  • 10%
  • 50%
  • 25%
Q.7.Phase shift oscillator consists
  • RL
  • RC
  • RLC
  • LC
Q.8.Multivibrater Produces
  • Sine wave
  • Square wave
  • Smooth wave
  • sawtooth
Q.9.Convert the 101101 Binary number into octal no
  • 65
  • 55
  • 51
  • 45    
Q.10.The number10 is represented  in BCD Number System
  • 10100
  • 1100
  • 010111
  • None of these
Q.11.Which PNP device has a terminal for synchronizing purpose
  • SCS
  • Triac
  • Diac
  • SUS
Q.12.Addition of indium in semiconductor crystal makes
  • PNP
  • NPN
  • PNPN
  • NPNP
Q.13.Free electron exists in which band
  • 1
  • 2
  • 3
  • Conduction band
Q.14.Ripple factor of half wave rectifier
  • 1.21
  • 0.48
  • 0.5
  • None of these
Q.15.Transistor that can be used in enhancement mode
  • NPN
  • UJT
  • JFET
  • MOSFET
Q.16.Following contributes to harmonic distortion in Amplifier
  • +Ve feedback
  • –Ve feedback
  • Defective active device
  • None of these
Q.17.High cutoff frequency
  • CB
  • CC
  • CE
  • None of these
Q.18.Which is used as data selector?
  • Encoder
  • Decoder
  • modulator
  • Demodulator
Q.19.Read write capable memory
  • RAM
  • ROM
  • Both
  • None of these
Q.20.the radix or base of hexadecimal number system is -----------
  • 8
  • 16
  • 5
  • none of these
Q.21.the no of 1’s in the binary representation of the expression 162*9+162*7+16*5+3 are
  • 10
  • 23
  • 6
  • 4
Q.22.the no of latches in F/F are -------
  • 1
  • 2
  • 3
  • 4
Q.23.how many flip-flops are required to construct Mod -12 counter
  • 5
  • 4
  • 12
  • none
Q.24.which logic gate has the output is compliment of its input ----------
  • OR
  • AND
  • NOT
  • X-OR
Q.25.no.of 2-input multiplexers needed to construct a 210 input multiplexer…….
  • 12
  • 31
  • 20
  • 16
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