IE important question

For an SCR, di/dt protection is achieved through the use of (required)

• R in series with SCR (required in all cases except open-ended & draw questions)
• L in series with SCR (required in all cases except open-ended & draw questions)
• RL in series with SCR (optional)
• RLC in series with SCR (optional)

In which mode of operation, Self commutation can achieved?

• 180
• 120
• 360
• 270

Among the following which component is best suitable for inverter application

• SCR
• BJT
• MOSFET
• IGBT

Which power electronics switch can be the best for boost converter?

• SCR
• MOSFET
• Mechanical Switch
• TRAIC

What is the voltage equation of step up / down chopper with α as the duty cycle and Vs as the dc input voltage is

• Vs / (1 – α)
• α x Vs
• Vs * α / (1-α)
• Vs * α/ (1+α)

What will be the output voltage for a Buck-Boost Converter, if α = 0.5

• Vo = Vs
• Vo < Vs
• Vo > Vs
• Data insufficient

Find the output voltage expression for a boost converter with Vs as the input voltage and α as the duty cycle.

• Vo = Vs/α
• Vo = Vs x α
• Vo = Vs/(1-α)
• Vo = 2Vs/απ

Name the chopper in which output voltage is greater than input voltage

• Step up Chopper
• Step Down Chopper
• BuckBoost
• Buck

What type of conversion takes place in a Chopper

• AC to DC
• DC to AC
• DC to DC
• AC to AC

Name the chopper which is used for regenerative braking of dc motor

• CLASS A CHOPPER
• CLASS B CHOPPER
• CLASS C CHOPPER
• CLASS D CHOPPER