Q.1
An RC oscillator uses
  • one RC combination
  • two RC combinations
  • at least three RC combinations
  • either (a) or (b)
Q.2
Which power amplifier can deliver maximum load power?
  • Class A
  • Class AB
  • Class B
  • Class C
Q.3
In a common emitter, unbypassed resister provides
  • voltage shunt feedback
  • current series feedback
  • negative voltage feedback
  • positive current feedback
Q.4
Colpitts oscillator consists of _____ capacitor and _______ inductor
  • one, one
  • one, two
  • two, two
  • two, one
Q.5
The abbreviation PIV in the case of a diode stands for ____________
  • Peak Inferior Voltage
  • Problematic Inverse Voltage
  • Peak Inverse Voltage
  • Peak Internal Voltage
Q.6
The bandwidth of an RF tuned amplifier is dependent on
  • Q –factor of the tuned o/p circuit
  • Q –factor of the tuned i/p circuit
  • Quiescent operating point
  • Q-factor of the o/p and i/p circuits as well as quiescent operating point
Q.7
An exponential amplifier has diode in feedback path.
  • True
  • False
Q.8
The threshold voltage of a diode at Antarctica and India were found to be V1 and V2 respectively. Which of the following relations between V1 and V2 hold good?
  • V1 > V2
  • V1 = V2
  • V1 < V2
  • Can’t be determined
Q.9
To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
  • surge resistor
  • surge inductor
  • surge capacitor
  • both (a) and (b)
Q.10
Reverse collector saturation current ICBO is __________
  • Collector current when emitter current is zero
  • Collector current when base current is zero
  • Same as reverse saturation current
  • Collector current when either emitter or base current is zero
Q.11
The coupling capacitor in amplifier circuits
  • affects dc biasing
  • does not affect dc biasing
  • affects dc biasing to some extent
  • both (a) and (c)
Q.12
The effective channel length of a MOSFET in a saturation decreases with increase in
  • Gate voltage
  • Drain voltage
  • Source voltage
  • Body voltage
Q.13
For high frequencies a capacitor like
  • an open circuit
  • a short circuit
  • either open circuit or short circuit
  • none of the above
Q.14
Which of the following power amplifiers has highest efficiency?
  • Class A
  • Class AB
  • Class B
  • Class C
Q.15
The input voltage for starting oscillations in an oscillator is caused by
  • negative feedback
  • positive feedback
  • noise voltage in resistors
  • a special generator
Q.16
In a push pull circuit
  • each transistor conducts for 180°
  • each transistor conducts for more than 180° but less than 360°
  • each transistor conducts for less than 180°
  • the period of conduction of each transistor depends on circuit configuration
Q.17
In a half wave diode rectifier circuit the current flows in the load circuit for
  • 90° in each cycle
  • 180° in each cycle
  • 270° in each cycle
  • 360° in each cycle
Q.18
How is BJT used as a faster switch?
  • By operating it in the saturation and cut-off region
  • By operating it in the active and cut-off region
  • By using it in strong saturation
  • By decreasing its ON resistance
Q.19
The encapsulation of transistor is necessary for
  • Preventing radio interference
  • Preventing photo-emission effects
  • Avoiding loss of free electrons
  • Mechanical ruggedness
Q.20
What is the condition if no external potential energy is applied to the PN junction then diode ?
  • Forward biased
  • Reversed biased
  • Zero Bias
  • None of These
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