Analog Electronics Mcqs - Set 3

1)   A source follower using an FET usually has a voltage gain which is___________?

a. greater than +100
b. slightly less than unity but positive
c. exactly unity but negative
d. about -10
Answer  Explanation 

ANSWER: greater than +100

Explanation:
No explanation is available for this question!


2)   An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.

a. 10 volts
b. 5 volts
c. 5/1 volts
d. 5/2 volts
Answer  Explanation 

ANSWER: 5/2 volts

Explanation:
No explanation is available for this question!


3)   A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?

a. CMMR
b. Bandwidth
c. Slew rate
d. Open-loop gain
Answer  Explanation 

ANSWER: Slew rate

Explanation:
No explanation is available for this question!


4)   The effective channel length of a MOSFET in a saturation decreases with increase in___________?

a. Gate voltage
b. Drain voltage
c. Source voltage
d. Body voltage
Answer  Explanation 

ANSWER: Drain voltage

Explanation:
No explanation is available for this question!


5)   An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?

a. 0.25
b. 0.5
c. 0.75
d. 1
Answer  Explanation 

ANSWER: 0.5

Explanation:
No explanation is available for this question!


6)   Class AB operation is often used in power large signal amplifiers in order to_________?

a. get maximum efficiency
b. remove even harmonics
c. overcome a crossover distortion
d. reducing collector dissipation
Answer  Explanation 

ANSWER: overcome a crossover distortion

Explanation:
No explanation is available for this question!


7)   Negative feedback in an amplifier____________?

a. Reduces gain
b. Increase frequency &phase distortion
c. Reduces bandwidth
d. Increases noise
Answer  Explanation 

ANSWER: Reduces gain

Explanation:
No explanation is available for this question!


8)   The current gain of a bipolar transistor drops at high frequencies because of____________?

a. Transistor capacitances
b. High current effects in the base
c. Parasitic inductive elements
d. The early effect
Answer  Explanation 

ANSWER: Transistor capacitances

Explanation:
No explanation is available for this question!


9)   Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?

a. Internal Capacitance of the device
b. Coupling capacitor at the input
c. Skin effect
d. Coupling capacitor at the output
Answer  Explanation 

ANSWER: Internal Capacitance of the device

Explanation:
No explanation is available for this question!


10)   The action of JFET in its equivalent circuit can best be represented as a_____________?

a. Current controlled Current source
b. Current controlled voltage source
c. Voltage controlled voltage source
d. voltage controlled current source
Answer  Explanation 

ANSWER: voltage controlled current source

Explanation:
No explanation is available for this question!