If one of the resistors in a parallel circuit is removed, what happens to the total resistance?
ADecreases
Bincreases
Cexactly doubles
Dremains constant
Electrical Engineering · Question Bank
DC Circuits
15 of 52 questions match. Answer in your head first, then check the solution.
In a parallel circuit the potential difference across the resistance
Avaries
Bis different from the applied voltage
Cis sometimes constant
Dis always constant
The condition in Ohm’s Law is that
Aratio V/I should be constant
Bcurrent should be proportional to voltage
Cthe temperature should remain constant
Dthe temperature should vary
A switch is connected across a 220 V supply. What is the voltage across the switch when it is opened?
A0 V
B110 V
C220 V
D440 V
The curve representing Ohm’s law is
Aa parabola
Blinear
Ca sine function
Da hyperbola
The concept of Ohm's law is not applicable in which of the following?
AAlternating current circuits
BHigh current circuits
CSemiconductors
DSmall resistors
To determine the polarity of the voltage drop across a resistor, which one is needed to be known?
AOhmic value of the resistance in the resistor
BValue of current through the resistor
CType of voltage applied in the circuit
DCurrent direction in the resistor
The useful current that is delivered by a solar panel can be increased by.
AConnecting capacitors in parallel with the solar cells
BConnecting resistors in series with the solar cells
CConnecting two or more groups of solar cells in parallel
DConnecting resistors in parallel with two solar cells
Which of the following statements is true?
AA rheostat needs three terminals
BAn open resistor has a resistance of zero ohm
CCarbon resistors can have a power rating less than 2
DWire-wound resistors cannot be used for a rheostat
Which of the following statements is true to both series and parallel circuits?
AVoltage are additive
BCurrents are additive
CPowers are additive
DAll of these
In a parallel circuit with unequal branch resistances
AThe current is highest in the lowest
BThe current is highest in the highest
CThe current is equal in all the branches
DThe voltage is highest across the lowest
Which of the following is the same in all parts of a series circuit?
ACurrent
BVoltage
CPower
DResistance
The physical size of a resistor that determines its ability to absorb heat is rated in which of the following units?
AOhms
BVolts
CWatts
DKilowatt-hour
The algebraic sign of an IR drop is primarily dependent on which of the following?
AAmount of current flowing through it
BValue of resistance
CDirection of current flow
DBattery connection
Wire wound resistors are unsuitable for use at high frequencies. Why?
AThey are likely to melt under excessive eddy currents
BThey exhibit unwanted inductive and capacitive effects
CThey will create more electrical noise
DThey will consume more power
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