Current Affairs Of Pakistan 2020 Free Online MCQS With Answers

Current Affairs Of Pakistan

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Current Affairs Of Pakistan

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Current Affairs Of Pakistan
Current Affairs Of Pakistan

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Current Affairs Of Pakistan

An SCR can be used———–?
A. as static conductor
B. for power control
C. for speed control of dc shunt motor
D. All of these (Answer)
With gate open, the maximum anode current at which SCR is turned off from ON condition is called————?
A. breakdown voltage
B. peak reverse voltage
C. holding current (Answer)
D. latching current
A crowbar is a circuit which is used to protect a————-?
A. voltage sensitive load from excessive dc power supply output voltages (Answer)
B. current sensitive load from excessive dc power supply output voltages
C. voltage sensitive load from excessive ac power supply output voltages
D. current sensitive load from excessive ac power supply output voltages
Bidirectional semiconductor device is———–?
A. Diode
B. BJT
C. SCR
D. TRIAC (Answer)
A full wave rectifier with resistive load produces———–?
A. Second harmonic
B. Third harmonic
C. Fifth harmonic
D. Do not produce harmonics (Answer)
An ideal diode is———–?
A. Unidirectional
B. Bidirectional
C. Fixed voltage polarity
D. Only (a) and (c) (Answer)
The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is———–?
A. Sine wave
B. Square wave (Answer)
C. Saw – tooth wave
D. Trapezoidal wave
The IGBT resulted in higher switching speed and lower energy losses. It can be used for———–?
A. Uninterruptible power supplies
B. Induction heating system
C. Constant voltage and frequency power supplies
D. All of these (Answer)

Current Affairs Of Pakistan
To detect an over – current fault condition, the most reliable method is to connect a————-?
A. Current sensor across IGBT
B. Voltage sensor across IGBT
C. Current sensor in series with IGBT (Answer)
D. Voltage sensor in series with IGBT
261.Harmonics in 3 phase inverters can be reduced by using———–?
A. Passive filter
B. Active filter
C. Both passive and active filters (Answer)
D. None of these
The on – state voltage drop of IGBT consists of———-?
A. Drop across the collector junction
B. Drop across the drift region
C. Drop across MOSFET portion
D. All of these (Answer)
The maximum firing angle in the half wave controlled regulator is————-?
A. 180 degree
B. 190 degree
C. 200 degree
D. 210 degree (Answer)
With increase in firing angle,
A. Both harmonic distortion and quality of input current increases
B. Harmonic distortion increases and quality of input current decreases (Answer)
C. Harmonic distortion decreases and quality of input current increases
D. Both harmonic distortion and quality of input current decreases
n a phase controlled 3 phase ac voltage controller, the harmonic present is———-?
A. 2nd (Answer)
B. 3rd
C. 5th
D. 7th
The power MOSFET device is a———–?
A. Current controlled unipolar device
B. Voltage controlled unipolar device (Answer)
In dual converters—————-?
A. Both rectifiers provides positive current to the load (Answer)
B. Both rectifiers provide negative current to the load
C. One rectifiers provide positive current to the load and the other negative current
D. One rectifier provide positive current to the source and the other negative current to the load
The conduction losses in IGBT is————?
A. More than that of MOSFET
B. Lower than that of MOSFET (Answer)
C. Equal to that of MOSFET
D. Equal to that of BJT

Current Affairs Of Pakistan
For a buck converter to reduce the conduction losses in diode
A. A high on – resistance switch can be added in parallel
B. A low on – resistance switch can be added in parallel
C. A high on – resistance switch can be added in series
D. A low on – resistance switch can be added in series (Answer)
For bidirectional operation of converters————?
A. A parallel combination of controllable switch and a diode is used (Answer)
B. A parallel combination of controllable switch and capacitor is used
C. A series combination of controllable switch and a diode is used
D. A series combination of controllable switch and a capacitor is used
In rectifiers, load current flow is———?
A. Unidirectional (Answer)
B. Bidirectional
C. Either (a) or (b)
D. Non directional
Due to non sinusoidal waveform of the input current, the power factor of the rectifier is————?
A. Negatively affected by firing angle
B. Negatively affected by distortion of the input current
C. Positively affected by both firing angle and distortion of the input current
D. Both (a) and (b) (Answer)
Single phase VSI are mainly used in———–?
A. Power supplies
B. Ups
C. Multilevel configuration
D. All of these (Answer)
The man made noise sources is / are————-?
A. Motors
B. Switches, radio interferences
C. Computers, digital electronics
D. All of these (Answer)
Very large values of modulation index (greater than 3.24) lead to———–?
A. Square AC output voltage (Answer)
B. Sine AC output voltage
C. Triangular AC output voltage
D. Trapezoidal AC output voltage

Current Affairs Of Pakistan
Any electrical signal present in a circuit other than the desired signal is known as————–?
A. Noise (Answer)
B. Distortion
C. Interference
D. All of these
In single phase VSI, the harmonic which is not present is————?
A. 2nd (Answer)
B. 3rd
C. 5th
D. 7th
In commutation PAC stands for——-?
A. Permanent angle converter
B. Phase angle converter (Answer)
C. Phase angle commutation
D. Phase and commutation
Double fourier series analysis of PWM is————-?
A. Two dimensional functions (Answer)
B. Three dimensional functions
C. One dimensional functions
D. All of these
In the operation and control of both naturally commutated and forced commutated SCR base converter, commutation plays an important role. The converters is / are ———–?
A. AC – DC
B. DC – DC
C. DC – AC
D. All of these (Answer)
In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output
A. Zero
B. Switches between – 1 / 2 and + 1 / 2 (Answer)
C. Switches between – 1 and + 1
D. Switches between 0 and + 1

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