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WorksheetsPower Electronics Quiz (BEE503)
Total questions: 20
Worksheet time: 18mins
The application of a DC/DC type converters is
Mobile phone
PDA
Wind turbines
All the above
AC/AC converters in a solar power plant use ____ range of frequency.
50 Hz to 60 Hz
60 Hz to 70 Hz
40 Hz to 60 Hz
10 Hz to 60 Hz
In a power supply unit, during ON mode, the switch is in ______ mode
reverse active
active
cut off
saturation
When comparing the operation of a light switch and a dimmer switch, which statement is true?
A light switch requires a continuous flow of electricity while a dimmer switch does not
The energy consumption of a light switch is less than a dimmer switch
A dimmer switch requires a continuous adjustment of the brightness level
A light switch does not allow for variable levels of brightness
What is the primary function of an inverter in a solar power system?
Convert DC power to AC power
Store excess energy
Regulate voltage levels
Control power distribution
What is the primary advantage of using power electronics in renewable energy systems?
Improved efficiency
Reduced complexity
Lower cost
Increased power consumption
What is the primary function of a flyback converter in power electronics?
Step-up voltage conversion
Step-down voltage conversion
Isolation of input and output
Power factor correction
Explain how pulse-width modulation (PWM) is used in controlling the speed of an electric motor.
Vary the pulse width based on input voltage
Vary the frequency of the pulse based on load current
Vary the amplitude of the pulse based on output power
Vary the duty cycle of the pulse based on desired output
What is the importance of the duty cycle in controlling the speed of a ceiling fan?
It determines how fast the fan blades rotate
It adjusts the angle of the fan blades
It regulates the amount of air circulation
It affects the energy consumption of the fan
For a step-down chopper shown in the figure below, dc source voltage = 230 V and the voltage drop across the chopper = 2 V. Find the value of average output voltage for a duty cycle of 0.4.
230 V
92 V
90 V
91.2 V
The magnitude of gate voltage and gate current for triggering an SCR is
inversely proportional to the temperature
directly proportional to the temperature
inversely proportional to the anode current requirement
directly proportional to the anode current requirement
A single phase voltage controller has input of 230 V and a load of 15 Ω resistive. For 6 cycles on and 4 cycles off, determine the rms output voltage.
189 V
260 V
156 V
178 V
In VSI (voltage source inverters)
both voltage and current depend on the load impedance
only voltage depends on the load impedance
only current depends on the load impedance
none of the mentioned
The minimum value of anode current below which it must fall to completely turn-off the device is called as the
holding current value
latching current value
switching current value
peak anode current value
Which of the following terminals does not belong to the MOSFET?
Drain
Gate
Base
Source
In a buck converter, if the input voltage is 120 V and the duty cycle is 0.5, what is the average output voltage?
120 V
60 V
30 V
90 V
Which of the following is a common application of a boost converter?
Electric vehicles
Battery charging
All the above
LED lighting
What is the primary purpose of a snubber circuit in power electronics?
Reduce voltage spikes
Increase current flow
Improve efficiency
Control temperature
In the forward blocking mode of a silicon controlled rectifier, the SCR is
In on state
In natural state
Forward biased state
In off state
The anode current passing through a conducting silicon-controlled rectifier is 20 A. If its gate current is made half, what will be the anode current?
10 A
20 A
5 A
30 A
