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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