Technician A says that an Allison hydromechanical transmission can be operated in PTO mode when the engine is running and the transmission is in neutral. Technician B says that an Allison transmission PTO gear is driven by the torque converter turbine. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: C
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By the year 2050, scientists predict there will be _____ billion people in the world
A) just under 2 B) not more than 5 C) over 11 D) not less than 50
The reason for using a reducing plenum system is to ____.
A. reduce maintenance costs B. reduce the operating cost of the system C. provide easier means of fastening the takeoff fittings D. maintain a constant pressure throughout the length of the trunk duct
What is a k factor?
A) A measure of specific heat capacity in BTU/lb B) A measure of thermal resistance in BTU/hr/ft2/°F/in of thickness C) A measure of thermal conductivity in BTU/hr/ft2/°F/in of thickness D) A measure of heat content in BTU/lb
A dc/dc converter consists of a 100 V dc source in series with a 10 ? load resistance and a bipolar transistor. Assume that the transistor is an ideal switch. In each cycle, the transistor is turned on for 100 ?s and turned off for 300 ?s. Calculate the following:
a. Switching frequency of the converter b. Average voltage across the load c. Average load current d. rms voltage across the load e. rms current f. rms power consumed by the load