Chapter1- Low power amplifier MCQ questions with answer

  

------------------ circuit is used to provide strength to weak signals

a)      Oscillator

b)      Voltage regulator

c)       Amplifier

d)      Integrator

 

The function of resistor RE in single stage CE amplifier is ------------------

a)      To provide biasing

b)      To provide stabilization to transistor

c)       Block ac and pass dc

d)      Block dc and pass ac

 

In voltage amplifiers, voltage gain Av is the ratio of------------------

a)      Output voltage to input voltage

b)      Output current to input current

c)       Output voltage to input current

d)      Input voltage to output voltage

 

In multistage amplifiers, output of one stage is connected to next stage by using ------------------

a)      Coupling devices

b)      Transistors

c)       Capacitors

d)      Resistors

 

Which is not coupling technique used in amplifiers?

a)      RC

b)      TC

c)       DC

d)      CC

 

Single stage CE amplifiers are used in audio amplifiers

a)      True

b)      False

 

Transformer coupling is used in power amplifier

a)      True

b)      False

 

Advantage of direct coupling technique, ------------------

a)       Circuit is simple

b)      Cost is less

c)       Small in size

d)    All of above

 

Frequency response of transformer coupling is ------------------

a)      Excellent

b)      Best

c)       Poor

d)      None of above

 

To select and amplify particular frequency signals ------------------ amplifiers are used.

a)      Single stage CE amplifiers

b)      Multistage amplifiers

c)       FET amplifiers

d)      Tuned amplifiers

 

Direct coupled amplifiers are used in ------------------ applications11

a)      Voltage amplifier

b)      Power amplifier

c)       Low frequencies applications

d)      None of above

 

In tuned amplifier, resistive load is replaced by ------------------

a)      Capacitor

b)      Inductor

c)       Tank circuit/tuned circuit

d)      Transformer

 

Tuned amplifiers works on ------------------principle

a)      Parallel resonance

b)      Feedback

c)       Coupling

d)      None of above

 

In staggered tuned amplifier, each tuned circuit is tuned at ----------------------- frequency which is useful to obtain increased bandwidth

a)      Same frequency

b)      Slightly different frequency

c)       Very high frequency

d)      None of above

 

In case of tuned amplifier, ___________ is a frequency at which the inductive reactance is equal to the capacitive reactance

a)      Cut off frequency

b)      Coupling frequency

c)      Tuning frequency

d)     Resonant frequency

 

To obtain greater voltage gain and power gain_________ amplifiers are used

a)      Power amplifier

b)      Tuned amplifier

c)      Multistage amplifier

d)      Class A amplifier

 

If value of inductor L is 10mH and capacitor C is 4.7 μf, resonant frequency of single tuned is ________

a)      73.412 Hz

b)      738.12 Hz

c)      743.12 Hz

d)      734.12 Hz