Podcast
Questions and Answers
What type of waveform will the AC supply side current have when the load current is assumed to be ripple free?
What type of waveform will the AC supply side current have when the load current is assumed to be ripple free?
- Square
- Triangular
- Sinusoidal
- Constant dc (correct)
Which type of converter is a chopper?
Which type of converter is a chopper?
- ac- ac converter
- dc - ac converter
- dc –dc converter (correct)
- ac – dc converter
What is an astable multivibrator primarily used for?
What is an astable multivibrator primarily used for?
- Square wave generation (correct)
- Constant dc generation
- Sinusoidal wave generation
- Triangular wave generation
What is another name for an induction motor?
What is another name for an induction motor?
In AC systems, what does the form factor measure?
In AC systems, what does the form factor measure?
For a balanced delta connected load, what is the phase angle between the line current in delta leg and its equivalent star-phase voltage?
For a balanced delta connected load, what is the phase angle between the line current in delta leg and its equivalent star-phase voltage?
What is the resistance value that must be added to obtain the rated torque at 1000 rpm?
What is the resistance value that must be added to obtain the rated torque at 1000 rpm?
If two transformers have one's linear dimensions twice as large as the other but use the same materials, what is the ratio of their kVA values?
If two transformers have one's linear dimensions twice as large as the other but use the same materials, what is the ratio of their kVA values?
In a three-phase slip induction motor fed from the rotor side with stator side short-circuited, what frequency of current flows in the short-circuited stator winding?
In a three-phase slip induction motor fed from the rotor side with stator side short-circuited, what frequency of current flows in the short-circuited stator winding?
What happens if the air gap in an induction motor is increased?
What happens if the air gap in an induction motor is increased?
Which type of motor is most suitable for a computer printer drive?
Which type of motor is most suitable for a computer printer drive?
Which of the following motors definitely has a permanent rotor?
Which of the following motors definitely has a permanent rotor?
In a DC machine, what do the carbon brushes do?
In a DC machine, what do the carbon brushes do?
What type of converter is an inverter?
What type of converter is an inverter?
Which factor does the electrical resistance of a conductor NOT depend on?
Which factor does the electrical resistance of a conductor NOT depend on?
How is the energy stored by a capacitor calculated?
How is the energy stored by a capacitor calculated?
When transforming a 60V voltage source with an internal resistance of 50Ω to a current source, what is the equivalent current source value?
When transforming a 60V voltage source with an internal resistance of 50Ω to a current source, what is the equivalent current source value?
What substance is responsible for slowing down neutrons in a nuclear power plant?
What substance is responsible for slowing down neutrons in a nuclear power plant?
Study Notes
Waveforms and Loads
- AC supply side current will exhibit a sinusoidal waveform when the load current is ripple free.
Converter Types
- A chopper is a type of converter that converts DC to DC while controlling the output voltage.
Astable Multivibrator
- Primarily used for generating square waves and timing applications in electronics.
Induction Motor
- Another name for an induction motor is an asynchronous motor due to its slip during operation.
AC Systems
- In AC systems, the form factor measures the ratio of the RMS value to the average value of a waveform.
Delta Connected Load
- For a balanced delta-connected load, the phase angle between the line current in the delta leg and its equivalent star-phase voltage is 30 degrees.
Torque and Resistance
- To obtain the rated torque at 1000 rpm, a specific resistance value must be added to the circuit which varies based on the motor design.
Transformer Dimensions
- If two transformers have one's linear dimensions double that of the other, the kVA values will have a ratio of 4:1, assuming the same materials are used.
Three-Phase Slip Induction Motor
- In a three-phase slip induction motor with the rotor side fed and stator side short-circuited, the current frequency in the short-circuited stator winding is zero.
Induction Motor Air Gap
- Increasing the air gap in an induction motor generally results in reduced efficiency and lower torque production.
Printer Drive Motor
- A stepper motor is the most suitable type for driving computer printers due to its precise control over movement.
Permanent Rotor Motors
- Synchronous motors definitely have a permanent rotor.
DC Machine Brushes
- In a DC machine, carbon brushes conduct electricity between the stationary and rotating parts while minimizing wear.
Inverter Type
- An inverter is a type of converter that converts DC to AC.
Electrical Resistance Factors
- The electrical resistance of a conductor does not depend on its color.
Capacitor Energy Storage
- The energy stored by a capacitor is calculated using the formula (E = \frac{1}{2} C V^2), where C is capacitance and V is voltage.
Current Source Transformation
- Transforming a 60V voltage source with an internal resistance of 50Ω to a current source results in an equivalent current source value of 1.2 A.
Neutron Moderation
- In a nuclear power plant, water or heavy water serves as the substance responsible for slowing down neutrons.
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Description
Test your knowledge on transformers in electrical engineering. Questions include calculating resistance for rated torque and determining the ratio of kVA for transformers with different dimensions but same materials.
