What is the peak factor for alternating current or voltage varying sinusiodally?
Correct Answer :
A.
Related Questions
The internal resistance of an ideal voltage source is
Infinite
Equal to the load resistance
Zero
To be determined
A rheostat is a form of
Variable resistor
Variable capacitor
Potentiometer
Thermocouple
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
Which of the following capacitors are used only in dc circuits?
Mica
Ceramic
Mylar
Electrolytic
Which of the statements below is not true?
Current source is an active element
Resistor is a linear element
Voltage source is a passive element
Diode is a non-linear element
Which one of the following elements serves as a protection against overload?
Fuse
Switch
Resistor
Relay
Which of the following is not a factor affecting dielectric strength?
Mass
Moisture content
Temperature
Thickness
What is the rms value of a square wave?
Equals its peak value
Equals its peak-to-peak value
Peak divided by square root of two
Peak divided by pi
What is a closed path made of several branches of the network called?
Junction
Node
Terminal
Loop
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
What is the reciprocal of quality factor?
Power factor
Reactive factor
Dissipation factor
1/Q factor
When the temperature of copper wire is increased its resistance is
Increased
Decreased
Constant
Zero
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
The resistance of an insulator ___ when its temperature is increased.
Decreases
Remains the same
Increases
Varies
Delta to wye or wye to delta transformation technique is applied to a ___ network.
One-terminal
Two-terminal
Three-terminal
Complex
If three 100-pF capacitors are connected in seriesa then the total capacitance is
300 pF
100 pF
50 pF
33.3 pF
When the net reactance in a series coil-capacitor circuit is zero at frequency fa the nature of its reactance of frequency 2f is
Inductive
Capacitive
Resistive
Infinite
A capacitor opposes change in
Voltage
Current
Voltage and current
Neither voltage nor current
What is the complex impedance of a circuit with an absolute resistance of 300 ?
0 + j 300
300 + j 90
0 ± j 300
300 +j 0
What is the specific resistance of a pure germanium?
55 -cm
55 -m
55 -mm
55 k -m
The current is ____ times the maximum current at half-power points of a resonance curve.
What refers to such work at very low temperaturesa near absolute zero?
Cryogenics
Superconductivity
Subsonic
Thermionic
The usual load of a dc circuit is a/an
Resistor
Capacitor
Inductor
Both inductor and capacitor
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 refers to the lowest voltage across any insulator that can cause current flow?
Conduction voltage
Critical voltage
Breakdown voltage
Voltage capacity
What is the resonant frequency of a circuit when L of 3 microhenrys and C of 40 picofarads are in series?
14.5 kHz
145 MHz
14.5 MHz
145 kHz
What does a capacitor store?
Voltage
Charge
Current
Power
In an ac circuit with inductive reactance ?, the
Phase angle of the circuit is always 45�
Voltage across the inductance must be 90� out o f-phase witht he applied voltage
Current through the inductance lags its induced voltage by 90�
Current through the inductance and voltage across it are180� outof-phase
The maximum power transfer theorem is used in
Power system
Electronic system
Refrigeration
Air conditioning
An open resistor when checked with an ohmmeter reads
Zero
Infinite
High but within the tolerance
Low but not zero