37 ____________________________________ IN QUESTIONS 4-18 THROUGH 4-22, MATCH THE LIMITER CIRCUIT IN COLUMN A TO THE CIRCUIT DESCRIPTION IN COLUMN B. CHOICES MAY BE USED ONCE, MORE THAN ONCE, OR NOT AT ALL. A.   LIMITER           CIRCUIT 4-18.    1.    A 2.    B 3.    C 4.    D 4-19.    1.    A 2.    B 3.    E 4.    F B.   CIRCUIT DESCRIPTION A.   Series-positive limiter with no bias B.   Series-negative limiter with no bias C.   Series-positive limiter with negative bias D.   Series-positive limiter with positive bias E.   Series-negative limiter with negative bias F.   Series-negative limiter with positive bias 4-20.    1.    C 2.    D 3.    E 4.    F 4-21.    1.    C 2.    D 3.    E 4.    F 4-22.    1.  C 2.  D 3.  E 4.  F _______________________________________ 4-23.   In a parallel-diode limiter, (a) how is the output taken and (b) under what diode condition is it developed? 1.  (a) Across the resistor (b) When the diode is cut off 2.  (a) Across the resistor (b) When the diode is conducting 3.  (a) Across the diode (b) When the diode is conducting 4.  (a) Across the diode (b) When the diode is cut off 4-24.   In a parallel-positive limiter, where is the input sine wave applied? 1.  At the anode of the diode 2.  At the cathode of the diode 3.  Through a series resistor to the anode of the diode 4.  Through a series resistor to the cathode of the diode