In an oscilloscope, the ____ increase(s) the amplitude of the input voltage to the proper level for deflection of the electron beam in the cathode-ray tube.
A. sweep generator
B. horizontal and vertical deflection amplifiers
C. power supplies
D. synchronizing circuits
Answer: B
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Answer the following statement(s) true (T) or false (F)
1. Motors that used a centrifugal switch to disconnect the start windings cannot be used with variable voltage control.
2. Double-face clutches have both the armature and field discs mounted on the same hub.
3. The accompanying diagram has a double-face magnetic clutch.
4. Clutches cannot provide a smooth start for loads that can be damaged by sudden starting, or for high inertia loads such as centrifuges or flywheels
5. The problem with eddy current clutch circuits is that they lack a speed sensing device that automatically increases or decreases the DC excitation current when load is added or removed
Solve and reduce all answers to lowest terms:2/3 - 5/8 =
What will be an ideal response?
An energy-saving construction system developed by the Arkansas Power and Light Company uses 2* 6 wall studs spaced ____ inches OC (on center).
a.2 b.6 c.12 d.24
Answer the following statement(s) true (T) or false (F)
1. In a wye connection, the line current and phase current are not the same. 2. Dual voltage motors not intended for wye-delta connection will have certain terminals tied internally. 3. Dual voltage motors designed for wye-delta starting will supply all 12 T leads at the terminal connection box. 4. Closed transition starting does not disconnect the motor from the power line. 5. Open transition starting means that the motor is connected to the power line during the transition from wye to delta.