Randoms
https://lms.protechskillsinstitute.org/media/images/tg_images/J205LM.J1_L02_TG025.jpg
Side 2 shows what type of connections?
Low Voltage
False
180 degrees
When current and voltage are known how do you find resistance?
E/I
A frying pan is connected to a 110-volt circuit with a resistance of 10 ohms. How many amperes does the frying pan draw?
11 A
Draw a series connected winding
Figure 4-5
What percentage of normal bank capacity is avaiable on the secondary in an open delta connection?
A. 56.7%
B. 57.7%
C. 58 %
D. 66.7%
B. 57.7%
T or F
Transformer primary and secondary winding with the same characteristics can be series together for constant voltage or connected in parallel for higher source or load voltages
False
Series- Voltage is additive
Parallel- Voltage is constant
The polarity of the transformer is _________ when H1 and X1 are adjacent to each other and ______ when H1 is diagonal to X1
Subtractive
Additive
Free 200 points
+200
______ power is the actual power used at the load.
True power
What is the most common type of transformer use for residential power distribution?
A. Pole Mount
B. Pad Mount
C. Substation Mount
D. Panel Mount
A. Pole Mount
T or F
Multiple winding transformers can only be wired in parallel
False
______ convey important details about transformers capabilities.
Nameplate.
400 x 57.7% = 230.8 kVA
Single phase transformers are often used in power distribution because they can be connected in different ways for single phase or ___ __________ utilization.
3 Phase
What is the E stand for (full name) in the Ohm's law formula.
Electromotive Force
T or F
Single phase transformers are available in a variety of phase-shifting configurations to reduce specific harmonics?
False
Three Phase
Between page 123 and 125 identify a wye-delta transformer connection
Page 125 right hand side.
What's the primary voltage of a transformer with a 70:4 turn ratio and 48v secondary?
1680
In a 3 Phase Delta configured transformer the phase-phase is how many times the winding voltage?
1.732
Instrument transformers are also called ________ transformers and can step 2400V down to 120v.
A. Step up
B. Step down
C. Exhancer
D. Metering
D. Metering
T or F
Apparent power is the power that is stored and released by inductors and capacitors that flow back to the source.
False
Reactive
Draw a primary wye, secondary wye single voltage 3 phase line diagram connections
Picture
The winding current measured across a coil of a delta configured transformer is 3.67A. What is the line current?
6.36A
3.67 x 1.732
Free 500 points
+500