Task lighting is used to _____.
a. emphasize art or décor
b. illuminate a vertical surface
c. focus illumination on a specific surface
d. provide minimum exit lighting
c. focus illumination on a specific surface
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The ____________________ name is the Latin name for a plant
Fill in the blank(s) with correct word
Answer the following statement(s) true (T) or false (F)
Any water used to make concrete should be clean and even drinkable.
What statement best describes the action of a zener diode?
A) Zener diodes regulate voltage levels below their minimum forward bias B) Zener diodes are used mostly in tuning circuits C) Zener diodes regulate voltage upon exceeding reverse breakdown voltage D) When the diode is biased into saturation, it tends to regulate voltage because of it's bulk resistance
A separately excited DC motor is rated at 10 kW, 300 V, 1,000 rpm, and is supplied by a three-phase controlled bridge rectifier. The power supply is sinusoidal and rated at 220 V, 60 Hz. The motor armature resistance is 0.2 ?, and the motor constant is Ka = 1.38 V-s/rad. The motor delivers rated power at ? = 0°. Calculate the speed, power factor, and efficiency for a firing angle ? = 30° if the load torque is constant. Assume that additional inductance is present to ensure continuous conduction.
Find: Speed, power factor, and efficiency for a firing angle of 30°. Assumptions: Load torque is constant, and the DC motor deliver the power P at 0° of firing angle. Additional inductance is present to ensure continuous conduction.