GATE
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Graduate Aptitude Test in Engineering

GATE ECE

Network Theory
Control Systems
Electronic Devices and Vlsi
Analog Circuits
Digital Circuits
Microprocessors
Signals and Systems
Communications
Electromagnetics
General Aptitude
Engineering Mathematics

GATE CSE

Discrete Mathematics
Programming Languages
Theory of Computation
Operating Systems
Digital Logic
Computer Organization
Database Management System
Data Structures
Computer Networks
Algorithms
Compiler Design
Software Engineering
Web Technologies
General Aptitude

GATE CE

Engineering Mechanics
Strength of Materials Or Solid Mechanics
Structural Analysis
Construction Material and Management
Reinforced Cement Concrete
Steel Structures
Geotechnical Engineering
Fluid Mechanics and Hydraulic Machines
Hydrology
Irrigation
Environmental Engineering
Transportation Engineering
Geomatics Engineering Or Surveying
Engineering Mathematics
General Aptitude

GATE EE

Electric Circuits
Electromagnetic Fields
Signals and Systems
Electrical Machines
Engineering Mathematics
General Aptitude
Power System Analysis
Electrical and Electronics Measurement
Analog Electronics
Control Systems
Power Electronics
Digital Electronics

GATE ME

Engineering Mechanics
Strength of Materials
Theory of Machines
Engineering Mathematics
Machine Design
Fluid Mechanics
Turbo Machinery
Heat Transfer
Thermodynamics
Production Engineering
Industrial Engineering
General Aptitude

GATE PI

Engineering Mechanics
Strength of Materials
Theory of Machines
Engineering Mathematics
Machine Design
Fluid Mechanics
Heat Transfer
Thermodynamics
Casting
Metal Forming
Joining of Materials
Machine Tools and Machining
Metrology
Industrial Engineering

GATE IN

Engineering Mathematics
JEE
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Joint Entrance Examination

JEE Main

Physics
Chemistry
Mathematics

JEE Advanced

Physics
Chemistry
Mathematics

GATE EE

Choppers and Commutation Techniques

Power Electronics

(Past Years Questions)

START HERE

Marks 1

More
A buck converter, as shown in Figure $$(a)$$ below, is working in steady state. The output voltage and the inductor curr...
GATE EE 2016 Set 1
In the following chopper, the duty ratio of switch $$S$$ is $$0.4.$$ If the inductor and capacitor are sufficiently larg...
GATE EE 2015 Set 1
A step-up chopper is used to feed a load at $$400$$ $$V$$ $$dc$$ from a $$250$$ $$V$$ $$dc$$ source. The inductor curren...
GATE EE 2014 Set 2
The power electronic converter shown in the figure has a single-pole double-throw switch. The pole $$P$$ of the switch i...
GATE EE 2010
A step down chopper is operated in the continuous conduction mode in steady state with a constant duty ratio $$D.$$ If $...
GATE EE 2002
In a thyristor $$dc$$ chopper which type of commutation results in best performance?
GATE EE 1996
A $$dc$$ to $$dc$$ transistor chopper supplied from a fixed voltage $$dc$$ source feeds a fixed resistive-inductive load...
GATE EE 1995
Consider the chopper circuit of figure. The chopper operates at $$400$$ $$Hz$$ and $$50$$% duty cycle. The load current...
GATE EE 1995
Match the following List $$-$$ $${\rm I}$$ $$A.$$ Commutation $$B.$$ $$V$$ $$-$$ Curves $$C.$$ Free wheeling diode $$D.$...
GATE EE 1994
A chopper operating at a fixed frequency is feeding an $$R$$-$$L$$ load. As the duty ratio of the chopper is increased f...
GATE EE 1993

Marks 2

More
The figure shows two buck converters connected in parallel. The common input dc voltage for the converters has a value o...
GATE EE 2018
A dc to dc converter shown in the figure is charging a battery bank, B2 whose voltage is constant at 150 V. B1 is anothe...
GATE EE 2018
In the circuit shown all elements are ideal and the switch $$S$$ is operated at $$10$$ $$kHz$$ and $$60$$% duty ratio. T...
GATE EE 2017 Set 2
The input voltage $${V_{DC}}$$ of the buck-boost converter shown below varies from $$32$$ $$V$$ to $$72$$ $$V.$$ Assume ...
GATE EE 2017 Set 1
For the switching converter shown in the following figure, assume steady-state operation. Also assume that the component...
GATE EE 2015 Set 2
A buck converter feeding a variable resistive load is shown in the figure. The switching frequency of the switch $$S$$ i...
GATE EE 2015 Set 1
The circuit shown is meant to supply a resistive load $${R_L}$$ from two separate $$DC$$ voltage sources. The switches $...
GATE EE 2015 Set 1
A self commutating switch $$SW,$$ operated at duty cycle $$\delta $$ is used to control the load voltage as shown in the...
GATE EE 2015 Set 1
Figure (i) shows the circuit diagram of a chopper. The switch $$S$$ in the circuit in figure (i) is switched such that t...
GATE EE 2014 Set 1
In the figure shown below, the chopper feeds a resistive load from a battery source. $$MOSFET$$ $$Q$$ is switched at $$2...
GATE EE 2013
In the figure shown below, the chopper feeds a resistive load from a battery source. $$MOSFET$$ $$Q$$ is switched at $$2...
GATE EE 2013
In the circuit shown, an ideal switch $$S$$ is operated at $$100$$ $$kHz$$ with a duty ratio of $$50%$$. Given that $$\D...
GATE EE 2012
A voltage commutated chopper circuit, operated at $$500Hz,$$ is shown below. If the maximum value of load current is $$1...
GATE EE 2011
The L-C circuit shown in the figure has an inductance $$L=1mH$$ and a capacitance $$C = 10\mu F.$$ The initial current t...
GATE EE 2010
The L-C circuit shown in the figure has an inductance $$L=1mH$$ and a capacitance $$C = 10\mu F.$$ The $$L$$-$$C$$ circu...
GATE EE 2010
In the chopper circuit shown, the main thyristor $$\left( {{T_M}} \right)$$ is operated at a duty ratio of $$0.8$$ which...
GATE EE 2009
In the circuit shown in the figure, the switch is operated at a duty cycle of $$0.5.$$ A large capacitor current is conn...
GATE EE 2008
The circuit in the figure is current commutated $$dc$$ $$-$$ $$dc$$ chopper where, $$T{h_M}$$ is the main $$SCR$$ and $$...
GATE EE 2007
A voltage commutated chopper operating at $$1$$ $$kHz$$ is used to control the speed of $$dc$$ motor as shown in figure....
GATE EE 2006
A voltage commutated chopper operating at $$1$$ $$kHz$$ is used to control the speed of $$dc$$ motor as shown in figure....
GATE EE 2006
A voltage commutation circuit is shown in figure. If the turn off time of the $$SCR$$$$s$$ is $$50$$ $$\mu \sec $$ and ...
GATE EE 2006
The given figure shows a step $$-$$ down chopper switched at $$1$$ $$KHz$$ with a duty ratio $$D = 0.5.$$ The peak - pea...
GATE EE 2005
Figure shows a chopper operating from a $$100$$ $$V$$ $$dc$$ input. The duty ratio of the main switch $$S$$ is $$0.8.$$ ...
GATE EE 2004
Figure shows a chopper. The device $${S_1}$$ is the main switching device. $${S_2}$$ is the auxiliary commutation device...
GATE EE 2004
A chopper is employed to charge a battery as shown in figure. The charging current is $$5A$$. The duty ratio is $$0.2.$$...
GATE EE 2003
In the chopper circuit shown in fig the input $$dc$$ voltage has a constant value $${{V_s}}$$. the output voltage $${{V_...
GATE EE 2002
A step down chopper operates from a $$dc$$ voltage source $${V_s}$$ feeds a $$dc$$ motor armature with a back $$e.m.f$$ ...
GATE EE 2000

Marks 5

More
In fig, the ideal switch $$S$$ is switched on and off with a switching frequency $$f = 10 kHz.$$ The switching time peri...
GATE EE 2002
A voltage commutated thyristor chopper circuit is shown in fig. The chopper is operated at $$500$$ $$Hz$$ with $$50\% $$...
GATE EE 2001
A $$dc$$ motor with armature resistance $${R_a}$$ is fed from a step down chopper in the continuous mode, and operates a...
GATE EE 2000

EXAM MAP

Graduate Aptitude Test in Engineering

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Joint Entrance Examination

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