101 Basic Series - Module 21 - CEU Education
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1
There are three main ways to start a motor: With across-the-line starters, adjustable frequency drives, and reduced voltage starters.
2
By reducing voltage to the motor, torque is _________.
3
The starter type that requires a special motor (regardless of voltage system) is _________.
4
The current inrush from starting large motors can cause flickering lights or brownouts.
5
One reason for using reduced voltage starting is to avoid overload the distribution system.
6
When maximum starting torque per line amp is required, an autotransformer reduced voltage starter should be used.
7
Best starter type for high inertia load is _____.
8
In a primary resistor reduced voltage starter, the resistors resist the current flow, resulting in the voltage ____________.
9
One reason for using reduced voltage starting is to avoid stress on equipment or product lines.
10
The winding of the motor are operated in series during part winding reduced voltage starting.
11
A typical NEMA design B motor can draw _____ times its full load operating current at start-up.
12
With a wye-delta starter, while switching from wye to delta, the motor must disconnect and reconnect.
13
The least expensive starter type is ________.
14
Due to decreased voltage, torque is also reduced, which provides a soft, easy start for the motor and its load.
15
During acceleration, the SCR is responsible for controlling motor voltage, current and torque.
16
__________ uses an extra contactor and a set of resistors to keep the motor on-line during the switch from wye to delta.
17
The starter type that has three starting torques available through taps is _____.
18
A typical NEMA design B motor generates about _____ of its normal full load torque during start-up.
19
The transformer of an autotransformer starter ____ the current in order to reduce the voltage.
20
When connected in the delta configuration for starting, the winding are receiving reduced voltage.