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Voltage after which in forward bias current start to rise with increase in voltage is called:
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
Wavelength of X-rays is of the order of?
At resonance, the RLC circuit behaves like:
Voltage Is current In RC circuit.
that the supply for the potentiometer is taken?
PMC Practice 8
Physics
Alternating Current
Elimination Tool:
Identify the factor on which mutual inductance does not depend:
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
The direction of current through the load resistance of a full-wave rectification circuit:
UHS 2019
Physics
Alternating Current
Elimination Tool:
The frequency of applied AC is 2 kHz. Its time period will be:
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
Power factor in an AC circuit Is?
Impedance of a circuit Is calculated as:
The output voltage of a rectifier is:
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
Electromagnetic waves are produced due to flow of
Power of RCL circuit at resonance Is?
In case of half wave rectification the resistance of diode during negative half of A.C is:
UHS 2018
Physics
Alternating Current
Elimination Tool:
The angle made by the coil of an AC generator at a time Interval 3T/4 is?
A full wave rectifier is operating from 50 Hz mains. Fundamental frequency of ripple will be:
PMC Practice 1
Physics
Alternating Current
Elimination Tool:
If the instantaneous current in a circuit is given by I = A sin (wt) ampere, the RMS value of the current is:
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
What is the range of typical band gap in conductors
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
Which of the following color has the highest energy?
Power factor. of RLC circuit at Resonance Is
In a bridge type full-wave rectifier, if Vm is the peak voltage across the secondary coil of the transformer, the maximum voltage coming across each reverse biased diode is:
PMC Practice 5
Physics
Alternating Current
Elimination Tool:
In a half wave rectifier, the diode conducts during:
NUMS 2019 Reconduct
Physics
Alternating Current
Elimination Tool:
RLC circuit can be excited by
If the peak voltage is 9V, calculate the peak to peak voltage.
PMC Practice 8
Physics
Alternating Current
Elimination Tool:
Simple oscillating circuit consists of?
In a step-down transformer, the current in the primary coil is ______ than that in the secondary coil.
PMC 2021 Tested
Physics
Alternating Current
Elimination Tool:
The frequency of AC used in Pakistan is
In a step up transformer ________.
NTS 2019
Physics
Alternating Current
Elimination Tool:
In a full-wave rectification, the number of diodes used are:
PMC 2020
Physics
Alternating Current
Elimination Tool:
PIV stands for :
PMC 2020
Physics
Alternating Current
Elimination Tool:
The maximum efficiency of a half-wave rectifier is:
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
An alternating voltage source is connected to a resistor R, and a capacitor C, then which of the following statements about phase angle between voltage V and current I is correct?
NUMS 2019 Cancelled
Physics
Alternating Current
Elimination Tool:
In electronic circuits, a PN junction diode is used to convert alternating current into direct current. This process is called:
NTS 2018
Physics
Alternating Current
Elimination Tool:
Half wave voltage multipliers can provide what degree of voltage multiplication?
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
The principle of an AC generator is.
NTS 2019
Physics
Alternating Current
Elimination Tool:
Resistance of RCL series circuit at resonance Is?
In a pure resistive circuit current and voltage are
If a half wave rectifier is used to convert 50Hz AC into DC, then the number of pulses present in rectified voltage is:
PMC Sample 1
Physics
Alternating Current
Elimination Tool:
The AC generator is similar to:
PMC 2021 Tested
Physics
Alternating Current
Elimination Tool:
The bridge rectifier is preferred to an ordinary two diode full-wave rectifier because?
PMC Practice 2
Physics
Alternating Current
Elimination Tool:
In a practical transformer mutual induction between primary and secondary coils takes place. In such transformer what can be deduced about the power.
UHS 2018
Physics
Alternating Current
Work, Power & Energy
Elimination Tool:
Transformer is used in rectification to ___________ the supply voltage.
PMC Practice 5
Physics
Alternating Current
Elimination Tool:
A circuit that adds positive or negative D.C. voltage to an input sine wave is called:
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
The maximum instantaneous value measured from zero value is known as?
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
An alternation voltage V (in volts) is represented by the equation:
V = 300 sin (100πt)
What is the value of “f” for this voltage?
UHS 2019
Physics
Alternating Current
Elimination Tool:
The number of diodes in bridge rectifier is
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
In which rectifier is the ripple factor less?
PMC Practice 1
Physics
Alternating Current
Elimination Tool:
Current that fluctuates periodically with time is ——
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
Alternating Current Generators use:
PMC Practice 5
Physics
Alternating Current
Elimination Tool:
Reactance of an Inductor Is given by:
A half wave rectifier is operating from 50 Hz mains, fundamental frequency of ripple will be
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
Step up transformer have ________ turns in secondary coil.
PMC Practice 1
Physics
Alternating Current
Elimination Tool:
What will be the Impedance for V = 10 sin(wt) and I = 20 sln(wt)
If an AC voltage of rms value of 10 volts is applied as input of a half-wave rectifier, then the voltage value of the DC output will be:
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
What is the instantaneous power dissipated through a resistor of resistance 10 ohm if it is connected to an AC source of frequency 15 Hz at 1/180 sec if peak value is 20 V?
UHS 2018
Physics
Alternating Current
Elimination Tool:
The ripple factor of a half-wave rectifier is:
PMC Practice 2
Physics
Alternating Current
Elimination Tool:
The process of combining low frequency waves with high frequency is called:
P = Irms Vrms Is applicable for
X-rays have frequency greater than
Which of the following are component of half wave rectifier?
PMC Practice 1
Physics
Alternating Current
Elimination Tool:
The use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load:
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
Mutual inductance has a practical role in performance of:
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
Impedance in RLC series circuit Is given by
For an ideal step-up transformer Ps ——- Pp.
PMC Practice 8
Physics
Alternating Current
Elimination Tool:
Which of the following remains unchanged in a transformer.
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
Power factor of the pure capacitive circuit is?
In RLC series circuit at resonance, the A.C voltage across Resistance R, Inductance L and capacitance C are 5V, 10V and 10 V respectively. The A.C voltage applied to the circuit will be:
NUMS 2015
Physics
Alternating Current
Elimination Tool:
A diode works in _______ bias for rectification.
PMC Practice 6
Physics
Alternating Current
Elimination Tool:
The principle of a capacitor is based on which of the following facts?
NTS 2011
Physics
Alternating Current
Elimination Tool:
The rectifier is a device which converts?
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
An Inductor of 1H Is connected across a 220V, 50Hz supply. The peak value of current is approximately:
If a half-wave rectifier is used to convert 50 Hz AC into DC, then the number of pulses present in the rectifier voltage is:
PMC Practice 2
Physics
Alternating Current
Elimination Tool:
Consider two capacitors with capacitance 2µF and 4µF. With which type of connection will the 4µF capacitor have a greater amount of stored energy than the 2µF capacitor?
PMC Practice 2
Physics
Alternating Current
Elimination Tool:
