In class A operation, the input circuit of a JFET is ____________ biased?
(A) forward
(B) reverse
(C) not
(D) none of the above
The pinch-off voltage in a JFET is analogous to _____________ voltage in a vacuum tube?
(A) anode
(B) cathode
(C) grid cut off
(D) none of the above
Which of the following devices has the highest input impedance ?
(A) JFET
(B) MOSFET
(C) Crystal diode
(D) ordinary transistor
The two important advantages of a JFET are _________________?
(A) high input impedance and square-law property
(B) inexpensive and high output impedance
(C) low input impedance and high output impedance
(D) none of the above
In a JFET, when drain voltage is equal to pinch-off voltage, the depletion layers ______________?
(A) almost touch each other
(B) have large gap
(C) have moderate gap
(D) none of the above
A JFET has high input impedance because _________________?
(A) it is made of semiconductor material
(B) input is reverse biased
(C) of impurity atoms
(D) none of the above
In a certain common-source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is_______________?
(A) 1
(B) 11.4
(C) 8.75
(D) 3.2
A certain common-source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ______________?
(A) the voltage gain will increase
(B) the transconductance will increase
(C) the voltage gain will decrease
(D) the Q-point will shift
If load resistance in the above question (Q.49) is removed, the output voltage will_____________?
(A) increase
(B) decrease
(C) stay the same
(D) be zero