This set was probably intended as a replacement for the Model 71 B radio. The Type 63 manpack set was the newest item supplied by China. Needless to say this setrequired access to commercial power or a portable generator. This set covered 1.5 to 25 MHz in 8 bands. It was designed for fixed station use and operatedon 110 or 220 volts. The Chinese type 7512 Radio Receiver was an AM table model receiver that was wellconstructed but very heavy at 90 lb. This set was known to be used by the VietCong. without the batteries and was 61/2" x 101/2" x 11" and covered 2-12MHz. It was contained in a thin sheet metal case with a snap-onbattery case and had a switch for connection to an external battery.
The Type 139 radio receiver was a manpack AM set which could be interchanged with thereceiver of the 102E set. This set was being replaced by the XD 6 set which had the same technical characteristics. The receiver and transmitter alone weighed 38 lb. The complete set with accessories weighed 105 lb. The set was a 15 watt set with a range of 75 miles, and covered 2-12 MHz. versions but had a built-in voltmeter, an idea first seen in WW II Japanese generators. The hand-cranked generator looked just like the U.S. The transmitter required a 6410 hand cranked generator or a 964IE Dynamotor. The transmitter took up more space and the outer carrier, a metal chest housed the transmitter, receiver and a space for the D81 dry battery.
Now check the option by using formula CV = θ (a) 2.8 × 11.4285 = 32 μC ≠ 36 μC (option (a) is wrong) hence ‘c’ option can be right Now when 7V (b) 7V × 11.One of the most often captured radios was the Chicom Model 102E which was man-packed or mounted in vehicles. & when two capacitor ar e in parallel then their addition = C 1 + Solving : Equivalent capacitance, as C 2 & C 3 are in series and we know that when capacitance are in series equivalent capacitance =
(c) Then apply the remaining answer for remaining options. (b) By calculating capacitance, we can check which answer can be the solution, it reduce your effort in solving problem. Devising a plan : (a) We will first calculate equivalent capacitance of given figure. safe voltage in volts that can be applied across the combination and Corresponding total charge is C.
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