Calculate the following:
A dc, separately excited motor is used to hoist a constant-weight load. The motor
is driven by a full-wave, ac/dc converter. The voltage on the ac side is 110 V
(rms). The field constant of the motor K? is 3 Vs, and the armature resistance is 1
?. The armature current is continuous under loaded conditions. When the
triggering angle is 30o, the motor speed is 60 rpm.
a. Load torque
b. Load power
c. Armature current when the triggering angle is adjusted to 45°
d. Motor speed when the triggering angle is reduced to 30° and the field current
is reduced by 10%
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Fill in the blank(s) with the appropriate word(s).
The first state in Europe to establish banks was
a. Florence. b. Genoa. c. the Papal States. d. Venice.
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A) A1 B) B1 C) A3 D) A2
Refrigerant migration into the compressor crankcase will not usually occur if the temperature where the compressor is located is kept well above the _____.
a. height of the evaporator b. height of the condenser c. temperature of the thermostat d. temperature of system piping and components