A transformer has a 2:1 turns ratio. 120 V is applied to the primary. What is the secondary voltage?
A. 24 V
B. 60 V
C. 120 V
D. 600 V
Answer: B
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A bedplate has all of the main caps cast as one unit.
Answer the following statement true (T) or false (F)
The period of a waveform is the
A) height of the pulses expressed in volts. B) number of cycles per second. C) time interval from one pulse to the same point on the next pulse. D) time duration of each pulse.
A signal, x(t) = 20 cos (1000?t) is impulse sampled at a sampling rate of 2000 samples/second. Graph two periods of the impulse-sampled signal x?(t) . (Let the one sample be at time, t = 0.) Then graph four periods, centered at 0 Hz, of the CTFT X?( f ) of the impulse-sampled signal x?(t) . Change the sampling rate to 500 samples/second and repeat.
What will be an ideal response?
If the voltage on each leg to a contactor is 250 and the voltage on each leg leaving the contactor is 240 what corrective action is necessary?
a. Replace the contactor, the contacts are starting to pit, or burn. b. Have an electrician correct the voltage, 250 volts is too high. c. Clean or file down the contacts of the contactor. d. Don’t do anything, the motor is getting the proper voltage.