The ratio between the reactive power and the apparent power of an ac load is called
Quality factor
Power factor
Power ratio
Reactive power
Correct Answer :
D. Reactive power
Related Questions
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
How many degrees of phase represents one full cycle?
Which of the following is a common material used in wire-wound resistors?
Manganin
Carbon
Bronze
German silver wire
Which of the following is not considered a physical factor affecting resistance?
Length
Material type
Temperature
Cross-sectional
For a carbon composition resistora typical resistance values range from
2.7 to 22 M
1000 to 10000
10 to 10 M
2.7 to 2.7G
For a parallel ACcircuita ___ is used as a reference phasor.
Voltage
Power
Current
Resistance
What is the total capacitance of 10 capacitorsa each of 20 F in series?
200 F
2 F
100 F
0.5 F
What is the total effective capacitance of two 0.25 F capacitors connected in series?
0.125 F
1.25 F
0.50 F
2.5 if
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
Refers specifically to steady state values of quantities in ac circuits which are complex numbers.
Domain
Scalar quantity
Vector quantity
Phasor quantity
The usual load of a dc circuit is a/an
Resistor
Capacitor
Inductor
Both inductor and capacitor
Transient period is considered over after
What theorem is usually used in the analysis of transistor circuit?
Superposition theorem
Millman�s theorem
Thevenin�s theorem
Norton�s theorem
What is the hot resistance of a 100 Wa 220 V incandescent lamp?
For parallel capacitorsa total charge is
The sum of individual charges
Equal to the charge of either capacitors
Equal to the product of the charges
The quotient of the charges
What maximum voltage can be applied across the capacitor of time?
Working voltage
Surge voltage
Stray voltage
Peak voltage
³Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR�. This states
Compensation theorem
Reciprocity theorem
Millman�s theorem
Superposition theorem
In a pure capacitancea
Current leads voltage by 90�
Current leads voltage by 180�
Current lags voltage by 90�
Current lags voltage by 180�
The maximum power transfer theorem is used in
Power system
Electronic system
Refrigeration
Air conditioning
In calculating maximum instantaneous power ___ voltage or current is used.
Peak
Average
Rms
Instantaneous
At parallel resonancea the currents flowing through L and C are
Infinite
Zero
Unequal
Equal
What is the purpose of a load in an electric circuit?
To increase the circuit current
To decrease the circuit current
To utilize electrical energy
To make the circuit complete
Which of the following dielectric materials makes the highest-capacitance capacitor?
Air
Barium-strontium titanite
Mica
Electrolyte
What determines the direction of induced emf in a conductor or coil?
Cork screw rule
Fleming�s left hand rule
Ampere�s circuital law
Fleming�s right hand rule
The resistance of an insulator ___ when its temperature is increased.
Decreases
Remains the same
Increases
Varies
An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil
Faradic current
Transient ac current
Inductive current
Capacitive current
An electric circuit contains
Passive elements
Active elements
Both active and passive elements
Reactive elements
The ___ of an alternating quantity is defined as the fractional part of a period or cycle through which the quantity has advanced from selected origin.
Phase
Frequency
Amplitude
Waveform
Which component opposes voltage change?
Resistor
Inductor
Capacitor
Transistor
Under the conditions of maximum power transfera a voltage source is delivering a power of 15 W to the load. What is the power generated by the source?
60 W
30 W
15 W
4 W