Which of the following capacitors is suitable for dc filter circuits?
Mica
Ceramic
Paper
Electrolytic
Correct Answer :
D. Electrolytic
Related Questions
The unit of elastance is
Farad
Daraf
Siemen
Henry
An inductance of 1 mH is
0.001 H
0.01 H
0.0001 H
0.10 H
An ac series circuit is composed of a resistance of 20 a inductive reactance of 40 a and a capacitive reactance of 15 . If a current of 1 ampere is flowinga what is the applied voltage
320 V
32 V
220 V
22 V
A series-parallel combination of identical resistors will
Increase the power rating compared with one resistor alone
Increase the voltage rating compared with one resistor alone
Reduce the voltage rating compared with resistor alone
Result in an expensive circuit
Two capacitors of capacitance 9 F and 18 F in series will have a total capacitance of
27 F
162 F
6 F
180 F
An impedance given by 90 -45� is a/an ___ impedance.
Inductive
Conductive
Resistive
Capacitive
Norton�s theorem is what form of an ac equivalent circuit?
Voltage
Current
Both voltage and current
Neither voltage nor current
An alloy composed of 84 % coppera 12 % manganese and 4 % nickel.
Manganin
Constantan
Nichrome
German silver wire
The impedance in the study of electronics is represented by resistan
Inductance
Capacitance
Inductance and capacitance
Reactance
Barium-strontium titanite dielectric material is also called
Ceramic
Polyster
Electrolytic
Bakelite
Which of the following is not a factor affecting dielectric strength?
Mass
Moisture content
Temperature
Thickness
A factor that states how much the resistance changes for a change in temperature?
Resistivity
Specific resistance
Coefficient of temperature change
Temperature coefficient of resistance
A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in seriesa the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.
Child�s law
CR law
Coulomb�s law
Debye T3 law
The current is ____ times the maximum current at half-power points of a resonance curve.
Transient period is considered over after
Which one of the following elements serves as a protection against overload?
Fuse
Switch
Resistor
Relay
When resistance are connected in parallela the total resistance is
Less than the smallest resistance in the connection
Greater than the smallest resistance in the connection
Between the smallest and greatest resistance in the connection
Increasing and decreasing depending upon the supply voltage
A capacitance of 6 ��F means
6 pF
6 nF
6 fF
6 aF
What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?
1.65 kHz
16.5 MHz
16.5 kHz
165 kHz
In a parallel bank with unequal branch resistances
The highest R has the highest I
The lowest R has the highest V
The lowest R has the highest V
The highest R has the highest V
The internal resistance of an ideal current source is
Infinite
Zero
Equal to the load resistance
To be determined
In a circuita an active element is one which
Supplies energy
Receives energy
Both supplies and receives energy
Amplifies signal
The farad is not equivalent to which of the following combination of units
CV2
C2/J
C/V
J/V2
What is the hot resistance of a 100 Wa 220 V incandescent lamp?
What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?
Surge
Stray
Natural
Normal
The power factor of a certain circuit in which the voltage lags behind the current is 80 %. To increase the power to 100 %a it is necessary to add ___ to the circuit.
Inductance
Capacitance
Resistance
Impedance
What rating of a resistor determines its ability to absorb heat?
Wattage
Ohmic
Current
Voltage
The maximum power transfer theorem is used in
Power system
Electronic system
Refrigeration
Air conditioning
When frequency of an ac wave decreasesa the value of XLin a coil
Approaches zero
Gets larger positively
Gets larger negatively
Stays constant
A capacitor is basically constructed of
Two conductors separated by a dielectric
Two dielectric separated by a conductor
Conductors and dielectric
Conductors and semiconductors