3-42. What is the automatic time-out (time-delay) circuit used to prevent in most radar sets? 1. Power application to the filaments 2. Power application to the high-voltage sections prior to proper warm-up time 3. Radar transmission until airborne 4. Personnel injury during radar maintenance 3-43. During the search mode of operation, which of the following functions is NOT available? 1. Selectable range marks 2. Horizon antenna scan 3. Manual antenna control 4. Operable B-scope 3-44. In the fire control mode. operation is limited to what minimum range in yards? 1. 40,000 2. 20,000 3. 3,500 4. 2,500 3-45. Which of the following functions is NOT available in the bomb director mode? 1. PPI display 2. Controllable range and azimuth marks 3. Depressed-center sector scan 4. Operating ranges same as the search mode 3-46. The basic controls of the 11D13A are grouped into what total number of major categories? 1. Five 2. Two 3. Six 4. Four 3-47. The standby position of the 11D13A power switch applies which of the following types of power to the system? 1. Filament power only 2. Keep alive voltage to the TR tubes only 3. Filament power and keep alive voltage to the TR tubes 4. High voltage power to the varactor 3-48. The mode switch of the 11D13A selects one of the submodes of operation. 1. True 2. False 3-49. What component of the 11D13A allows the operator to select manual search operation? 1. Antenna control 2. Mode switch 3. Receiver gain 4. Power selector 3-50. With the 11D13A in the basic search mode, what type of display is presented? 1. Depressed-center PPI 2. A-scope 3. B-scope 4. PPI 3-51. With the 11D13A in the automatic search mode, which of the following indicators will display information? 1. A-scope and B-scope 2. A-scope and PPI 3. B-scope and PPI 4. B-scope and depressed-center PPI 3-52. Which of the following items causes the “jizzle” on the display in a fire control radar set during the automatic search mode of operation? 1. Antenna nutation 2. Antenna beamwidth 3. Acquisition marks 4. Target return 19