25 3-54.   How does the UJT differ from a conventional transistor?   1.    The UJT has a second base instead of a collector   2.    The UJT has a second emitter instead of a collector   3.    The UJT has two collectors 3-55.   When properly biased, what area(s) of the UJT act(s) as a resistor?   1.    The area between base 1 and base 2   2.    The area between emitter 1 and emitter 2   3.    The area between collector 1 and collector 2   4.    All of the above 3-56.   The emitter of the UJT may be compared to what electronic component?   1.    A fully charged capacitor   2.    The wiper arm of a variable resistor   3.    The collector of a conventional transistor   4.    The secondary winding of a step-down transformer 3-57.   What determines the level of voltage gradient at the emitter-base material contact point of a UJT?   1.    The bias voltage   2.    The manufacturer's specifications   3.    The base area of the emitter   4.    The voltage potential between base 2 and emitter 3-58.   The UJT conducts from base 1 to (a) what point when it is forward biased and from (b) what point to bass 2 when it is reversed biased? 1.    (a) Emitter (b) base 1   2.    (a) Emitter (b) emitter   3.    (a) Base 2 (b) base 1   4.    (a) Base 1 (b) emitter 3-59.   UJTs may be used in which of the following circuits? 1.    Switching   2.    Waveshaping   3.    Oscillating   4.    Each of the above 3-60.   The field-effect transistor (FET) combines what desired characteristic of the vacuum tube with the many other advantages of the transistor? 1.    Low output impedance   2.    High output impedance   3.    Low input impedance   4.    High input impedance 3-61.   What does the FET use to control the electrostatic field within the transistor?   1.    Current   2.    Voltage   3.    Low input impedance   4.    High input impedance 3-62.   The junction field-effect transistor's (JFET) gate element corresponds very closely in operation with (a) what part of a conventional transistor and (b) what part of the vacuum tube?   1.    (a) Emitter (b) cathode   2.    (a) Base (b) grid   3.    (a) Base (b) cathode   4.    (a) Collector     (b) plate 3-63.   In the JFET, the portion of the bar between the deposit of gate material is of a smaller cross section than the rest of the bar. What does this cross section form?   1.    A gate   2.    A drain   3.    A source   4.    A channel