Technician A says that AGM batteries should only be tested using a conductance tester. Technician B says that AGM batteries should only be charged using a special charger. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer: A
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Las tapas sólidas se utilizan en bandejas portacables para:
a. retener el calor dentro de bandejas en áreas sin calefacción. b. reforzar las bandejas. c. proteger el aislamiento de los cables de la luz solar directa. d. evitar la entrada de roedores.
A five-speed transmission is in fourth gear. Which is correct?
A) There is a 1:1 gear ratio
B) The 3-4 synchronizer has engaged the input shaft gear
C) Both A and B
D) Neither A nor B
A 220 V, dc series motor has an armature current of 86 A, armature resistance of 0.2 ?, and a field resistance of 0.1 ?. The terminal voltage of the motor can be adjusted by means of solid-state devices. Ignore the field saturation.
a. When the motor runs at 600 rpm, the armature current is 20 A. A 0.1 ? resistance is added in shunt to the field windings. If the load torque remains constant, calculate the speed of the motor. b. The resistance in shunt of the field windings is removed. The motor is used to lower the same mechanical torque described in (a) by a countercurrent braking method. The desired speed in the countercurrent braking is 10 rpm. The braking current is twice the rated value. Calculate the armature voltage of the motor.
The two substances used in liquid column thermometers are ____________________ and ____________________.
Fill in the blank(s) with the appropriate word(s).