The ohmic value of a resistor with negative temperature coefficient
Increases with increasing temperature
Increase with decreasing temperature
Stays unchanged with temperature change
Stays unaffected even with increasing temperature
Correct Answer :
B. Increase with decreasing temperature
Related Questions
What rating of a resistor determines its ability to absorb heat?
Wattage
Ohmic
Current
Voltage
A capacitor consists of two
Conductors only
Dielectric only
Conductors separated by a dielectric
Dielectric separated by a conductor
Which of the following is the peakiest?
Square wave
Sinusoidal wave
Triangular wave
Rectangular wave
The factor 0.707for converting peak to rms applies only to
Square waves
Triangle waves
Sawtooth waves
Sine waves
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
The electric field strength between capacitor plates has a unit
Volts per meter
Volts per mil
Amperes per meter
Amperes per mil
What does a capacitor store?
Voltage
Charge
Current
Power
At what frequency will the current in a series RLCcircuit reach its maximum value for an applied voltage of 15 V with R = 500 a L = 100 H and C= 0.001 F?
503 kHz
403 kHz
603 kHz
303 kHz
What is the temperature coefficient of the resistance Eureka?
Infinity
Negative
Almost zero
Positive
What is the hot resistance of a 100 Wa 220 V incandescent lamp?
It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.
Infinite
Zero
Low
High
What fusion of elements is without chemical action between them?
Mixture
Compound
Alloy
Ionization
When current and voltage arte in phase in an ac circuita the ___ is equal to zero.
Resistance
Reactance
Inductance
Capacitance
The presence of an electric current is made known by
Electric shock
Effects produced
Magnetic shock
Flashing
The curve between current and frequency is termed as
Voltage curve
Gain curve
Power curve
Resonance curve
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 is the specific resistance of a pure silicon?
55 -mm
55 -m
55 -cm
55 k -m
In an ac circuita the power dissipated as heat depends on
Impedance
Capacitive reactance
Resistance
Inductive reactance
The symbol Q refers to
Resonance quotient
Quality factor
Power quotient
Qualification test
The value of temperature coefficient ( ) is dependent upon
The nature of material and temperature
The length of material
The cross-sectional area of the material
The volume of the material
A rheostat is a form of
Variable resistor
Variable capacitor
Potentiometer
Thermocouple
The internal resistance of an ideal current source is
Infinite
Zero
Equal to the load resistance
To be determined
A neon glow lamp used as a night light ionizes at approximately
70 V
80 V
90 V
100 V
If the capacitance of mica capacitor is 5 times the capacitcitora then the relative permittivity of mica is
What is the most convenient way of achieving large capacitance?
By using multiplate construction
By using air as dielectric
By decreasing distance between plates
By using dielectric of low permittivity
A capacitor of 0.5 F charged to 220 V is connected across an uncharged 0.5 F capacitor. What is the voltage across each capacitor?
220 V
150 V
110 V
22 V
Two complex numbers or phasors are said to be conjugate if they
Differ only in the algebraic sign of their quadratic components
Differ only in the algebraic sign of their real components
Are equal in their real and quadrature components including alge
Are equal in their real components but differ in their quadrature components i ncluding algebraic signs.
The ratio between the active power and the apparent power of a load in an ac circuit is called
Quality factor
Power factor
Power ratio
Power reactive
Liquids that are good conductors because of ionization are called
Electrolytic
Bases
Acid
Electrolytes
When the movable plates of a gang capacitor completely overlap the fixed platesa the capacitance of the capacitor is
Halfway between maximum and minimum
Maximum
Minimum
Zero