Electrical Engineering · Question Bank

circuits

301 questions · page 12 of 16. Answer in your head first, then check the solution.

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#221
Why are inductance and capacitance not relevant in a dc circuit?
Abecause it is a simple circuit
Bbecause dc circuits only require resistance as load
Cbecause they do not exist in a dc circuit
Dbecause frequency of dc is zero
#222
When current and voltage are in phase in an ac circuit, the _____ is equal to zero.
Aresistance
Breactance
Cinductance
Dcapacitance
#223
Thevenin's theorem is what form of an equivalent circuit?
Acurrent
Bvoltage
Cboth current and voltage
Dneither current nor voltage
#224
Which of the following combination of length and cross-sectional area will give a certain volume of copper the least resistance?
A2L and A/2
Bdoes not matter because the volume of copper remains the same
CL and A
DL/2 and 2A
#225
The ratio between the reactive power and the apparent power of an ac load is called
Aquality factor
Bpower factor
Cpower ratio
Dreactive factor
#226
Norton's theorem is what form of an equivalent circuit?
Avoltage
Bcurrent
Cboth voltage and current
Dneither voltage nor current
#227
An inductive load always has a _____ power factor.
Aleading
Blagging
Czero
Dunity
#228
When resistances are connected in parallel, the total resistance is
Aless than the smallest resistance in the connection
Bgreater than the smallest resistance in the connection
Cbetween the smallest and greatest resistance in the connection
Dincreasing or decreasing depending upon the supply voltage
#229
The arc across a switch when it opens an RL circuit is a result of the
Alarge self-induced voltage across L
Blong time constant
Clow resistance of the open switch
Dsurge of resistance
#230
_____ is a rotating vector whose projection can represent either current of voltage in an ac circuit.
Apolar diagram
Bscalar quantity
Cvelocity
Dphasor
#231
Which factor does not affect resistance?
Alength
Bresistivity
Ccross-sectional area
Dmass
#232
Which of the following capacitors are used only in dc circuits?
Amica
Bceramic
Cmylar
Delectrolytic
#233
The maximum power transfer theorem is used in
Apower system
Belectronics circuits
Crefrigeration
Dair conditioning
#234
In Norton's theorem, the short circuit current is obtained by
Aoperating the load terminals
Bshorting the load terminals
Copening the voltage source
Dshorting the voltage source
#235
For maximum power transfer, what is the relation between load resistance Rl and the internal resistance of the voltage source?
ARl = 2 r
BRl = 1.5 r
CRl = r
DRl = 3 r
#236
A capacitor of 0.5 μF charged to 220 V is connected across an uncharged 0.5 μF capacitor. What is the voltage across each capacitor?
A220 V
B150 V
C110 V
D22 V
#237
When capacitors are connected in series, the total capacitance is
Asmaller than the smallest capacitor
Bsmaller than the largest capacitor
Cgreater than any of the capacitor
Dgreater than the largest capacitor
#238
What theorem is generally used in the analysis of vacuum tubes?
Asuperposition theorem
BMillman's theorem
CThevenin's theorem
DNorton's theorem
#239
Another term of the quality factor of the resonant circuit.
Afigure of merit
Bfigure of demerit
Cnoise factor
Dnoise figure
#240
Which of the following represents the energy stored in a capacitor?
A(CV^2)/2
B(2Q^2)/C
C(C^2)/V
DCV

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