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Inductance
Quiz 1
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Q.1
Which of the following are units for inductance?I. HenryII. Joules/(Ampere)2III. Volt . second/Ampere
I only
II only
III only
I and II only
I, II and III
Q.2
Which of the following is the total series capacitive reactance formula?
XCT = XC1 * XC2 * XC3....
XCT = XC1 - XC2 - XC3...
XCT = XC1 + XC2 + XC3...
XCT = 1/[(1/XC1) + (1/XC2) + (1/XC3) ...]
Q.3
Which component opposes any change in current?
Diode
Transistor
Inductor
Capacitor
Q.4
1 Henry is equivalent to
Weber.Tesla
V.s/A
Tesla/s
Weber.A/s
Q.5
A time-delay relay that uses an RC timing circuit is called a(n)_________
solid-state, time-delay relay
adjustable relay
dashpot time-delay relay
motor-driven, time-delay relay
Q.6
In an electric DC power supply, a capacitor is commonly used to__________
block the current flow
increase the current flow
filter out the unwanted AC voltage
decrease the voltage
Q.7
How power rating is specified for transformers?
Watts (W)
Voltage (V)
Volt ampere(VA)
Horse power(HP)
Q.8
Lenz's law states that the induced voltage across an inductor ____.
Always opposes the current through the inductor
Always opposes any change in current
Changes polarity as current changes direction
Always opposes the applied votage
Q.9
A coil that opposes any change in current flow is called a(n) __________
inductor
capacitor
transducer
oscillator
Q.10
A common inductor found in fluorescent light fixtures is a __________
starter
cathode
ballast
switcher
Q.11
The formula for calculating total parallel capacitance is __________
CT= C1 + C2 + C3...
(1/CT) = (1/C1) + (I/C2) + (1/C3)
CT= C1 * C2 * C3...
CT = C1 - C2 - C3 ....
Q.12
One of the effects a capacitor has in a DC circuit is that it will __________.
charge to a voltage equal to the source voltage
continue to charge until the source is completely drained
act like an open until it is fully charged
All of the above
None of the above
Q.13
Which of the following is a type of capacitor?
Electrolytic
Nonpolarized
Variable
All of the above
None of the above
Q.14
The energy stored by a capacitor is called a(n) __________.
induced voltage
electrostatic charge
voltage spike
All of the above
None of the above
Q.15
Capacitance is measured in __________.
Farads
henrys
Ohms
Volts
Q.16
Which of the following is the correct formula for calculating total parallel inductive reactance in a parallel circuit?
XLT = XL1 + XL2 + XL3 ...
XLT = XL1 * XL2 * XL3...
XLT = 1/[(1/XL1) + (1/XL2) + (1/XL3) ... ]
XLT = (1/XL1) + (1/XL2) + (1/XL3) ...
Q.17
Which of the following is the correct formula for calculating total series inductance?
LT = L1 + L2 + L3...
LT = L1 * L2 * L3...
LT = (1/L1) + (1/L2) + (1/L3) ..
All of the above
None of the above
Q.18
The resistance provided by an inductor in an AC circuit is called __________.
induced resistance
inductive reactance
electromotive force
All of the above
None of the above
Q.19
__________ affects a DC circuit only when the current is first turned on, turned off, or when there is a charge in the load resistance.
capacitance
Inductance
A time delay
A relay
Q.20
Inductance is measured in __________.
Ohms
Farads
henrys
RPMs
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