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Which of the following color has the highest energy?
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:
Transformer is used in rectification to ___________ the supply voltage.
PMC Practice 5
Physics
Alternating Current
Elimination Tool:
Simple oscillating circuit consists of?
If the peak voltage is 9V, calculate the peak to peak voltage.
PMC Practice 8
Physics
Alternating Current
Elimination Tool:
At resonance, the RLC circuit behaves like:
What will be the Impedance for V = 10 sin(wt) and I = 20 sln(wt)
Resistance of RCL series circuit at resonance Is?
A diode works in _______ bias for rectification.
PMC Practice 6
Physics
Alternating Current
Elimination Tool:
In a half wave rectifier, the diode conducts during:
NUMS 2019 Reconduct
Physics
Alternating Current
Elimination Tool:
A full wave rectifier is operating from 50 Hz mains. Fundamental frequency of ripple will be:
PMC Practice 1
Physics
Alternating Current
Elimination Tool:
An Inductor of 1H Is connected across a 220V, 50Hz supply. The peak value of current is approximately:
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:
Voltage after which in forward bias current start to rise with increase in voltage is called:
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
Voltage Is current In RC circuit.
Power of RCL circuit at resonance Is?
In a pure resistive circuit current and voltage are
A half wave rectifier is operating from 50 Hz mains, fundamental frequency of ripple will be
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
The maximum efficiency of a half-wave rectifier is:
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
In case of half wave rectification the resistance of diode during negative half of A.C is:
UHS 2018
Physics
Alternating Current
Elimination Tool:
Power factor of the pure capacitive circuit is?
Current that fluctuates periodically with time is ——
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
Which of the following are component of half wave rectifier?
PMC Practice 1
Physics
Alternating Current
Elimination Tool:
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:
Step up transformer have ________ turns in secondary coil.
PMC Practice 1
Physics
Alternating Current
Elimination Tool:
Which of the following remains unchanged in a transformer.
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
The rectifier is a device which converts?
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
Half wave voltage multipliers can provide what degree of voltage multiplication?
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
For an ideal step-up transformer Ps ——- Pp.
PMC Practice 8
Physics
Alternating Current
Elimination Tool:
The frequency of AC used in Pakistan is
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 number of diodes in bridge rectifier is
PMC Sample 3
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 maximum instantaneous value measured from zero value is known as?
PMC Sample 3
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:
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:
The bridge rectifier is preferred to an ordinary two diode full-wave rectifier because?
PMC Practice 2
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:
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:
In a full-wave rectification, the number of diodes used are:
PMC 2020
Physics
Alternating Current
Elimination Tool:
Impedance in RLC series circuit Is given by
The angle made by the coil of an AC generator at a time Interval 3T/4 is?
The AC generator is similar to:
PMC 2021 Tested
Physics
Alternating Current
Elimination Tool:
PIV stands for :
PMC 2020
Physics
Alternating Current
Elimination Tool:
In which rectifier is the ripple factor less?
PMC Practice 1
Physics
Alternating Current
Elimination Tool:
Mutual inductance has a practical role in performance of:
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
Electromagnetic waves are produced due to flow of
What is the range of typical band gap in conductors
PMC Sample 3
Physics
Alternating Current
Elimination Tool:
Power factor. of RLC circuit at Resonance Is
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:
Alternating Current Generators use:
PMC Practice 5
Physics
Alternating Current
Elimination Tool:
The ripple factor of a half-wave rectifier is:
PMC Practice 2
Physics
Alternating Current
Elimination Tool:
The output voltage of a rectifier is:
PMC Practice 4
Physics
Alternating Current
Elimination Tool:
Impedance of a circuit Is calculated as:
Power factor in an AC circuit Is?
Identify the factor on which mutual inductance does not depend:
PMC Practice 3
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:
RLC circuit can be excited by
that the supply for the potentiometer is taken?
PMC Practice 8
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 use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load:
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
The process of combining low frequency waves with high frequency is called:
X-rays have frequency greater than
The principle of an AC generator is.
NTS 2019
Physics
Alternating Current
Elimination Tool:
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:
In a step up transformer ________.
NTS 2019
Physics
Alternating Current
Elimination Tool:
Reactance of an Inductor Is given by:
P = Irms Vrms Is applicable for
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:
The frequency of applied AC is 2 kHz. Its time period will be:
PMC Practice 3
Physics
Alternating Current
Elimination Tool:
Wavelength of X-rays is of the order of?
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:
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:
