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1
GATE EE 2007
MCQ (Single Correct Answer)
+1
-0.3
A three - phase fully - controlled thyristor bridge converter is used as line commuted inverter to feed $$50kW$$ power $$420$$ $$V$$ $$dc$$ to a three phase, $$415$$ $$V$$ (line), $$50$$ $$Hz$$ $$ac$$ mains, Consider $$dc$$ link current to be constant. The $$rms$$ current of the thyristor is
A
$$119.05$$ $$A$$
B
$$79.37$$ $$A$$
C
$$68.73$$ $$A$$
D
$$39.68$$ $$A$$
2
GATE EE 2005
MCQ (Single Correct Answer)
+1
-0.3
The output voltage waveform of a three - phase square-wave inverter contains
A
only even harmonics
B
both odd and even harmonics
C
only odd harmonics
D
only triple harmonics
3
GATE EE 2000
MCQ (More than One Correct Answer)
+1
-0
Triangular $$PWM$$ control, when applied to a $$BJT$$ based three phase voltage source inverter, introduces.
A
low order harmonic voltages on the $$dc$$ side.
B
very high order harmonic voltage on the $$dc$$ side
C
low order harmonic voltage on the $$ac$$ side
D
very high order harmonic voltage on the $$ac$$ side
4
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
A $$PWM$$ switching scheme is used with a three phase inverter to
A
Reduce the total harmonic distortion with modest filtering
B
Minimize the load on the $$DC$$ side
C
Increase the life of the batteries
D
Reduce low order harmonics and increase high order harmonics
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Electric Circuits
Network Elements Transient Response Two Port Networks Sinusoidal Steady State Analysis Network Theorems Three Phase Circuits Graph Theory
Electrical Machines
Induction Machines D.C Machines Transformers Synchronous Machines
Engineering Mathematics
Vector Calculus Calculus Transform Theory Probability and Statistics Differential Equations Linear Algebra Numerical Methods Complex Variable
Signals and Systems
Continuous Time Signal Fourier Transform Miscellaneous Discrete Time Signal Z Transformation Continuous Time Periodic Signal Fourier Series Continuous and Discrete Time Signals Continuous Time Signal Laplace Transform Linear Time Invariant Systems Sampling Theorem
Power Electronics
Power Semiconductor Devices Ac Voltage Controllers Single and Three Phase Rectifier Choppers and Commutation Techniques Inverters
Power System Analysis
Circuit Breaker Parameters and Performance of Transmission Lines Switch Gear and Protection High Voltage Dc Transmission Symmetrical Components and Symmetrical and Unsymmetrical Faults Load Flow Studies Per Unit System Power Generation Cost Power System Stability Generating Power Station
Digital Electronics
Boolean Algebra Combinational Circuits Logic Gates Logic Families and Memories Minimization Sequential Circuits Analog to Digital and Digital to Analog Converter Microprocessor
Analog Electronics
Diode Circuits and Applications Feedback Amplifiers and Oscillator Circuits Frequency Response Bjt and Mosfet Biasing Small Signal Modeling 555 Timer Operational Amplifier
Electromagnetic Fields
Time Varying Fields Electrostatics Magnetostatics
Control Systems
Controller and Compensator Root Locus Techniques Polar Nyquist and Bode Plot State Variable Analysis Basics of Control System Time Response Analysis Routh Hurwitz Stability Block Diagram and Signal Flow Graph
Electrical and Electronics Measurement
Basic of Indicating Instruments Error Analysis and Measurement Cathode Ray Oscilloscope Measurement of Resistance and A.C Bridges Digital Voltmeters Questions Potentiometer and Instrument Transformers Measurement of Energy and Power
General Aptitude
Verbal Ability Logical Reasoning Numerical Ability
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