18 Questions
What type of waveform will the AC supply side current have when the load current is assumed to be ripple free?
Constant dc
Which type of converter is a chopper?
dc –dc converter
What is an astable multivibrator primarily used for?
Square wave generation
What is another name for an induction motor?
Asynchronous motor
In AC systems, what does the form factor measure?
Peak value to the rms value ratio
For a balanced delta connected load, what is the phase angle between the line current in delta leg and its equivalent star-phase voltage?
heta
What is the resistance value that must be added to obtain the rated torque at 1000 rpm?
5.7Ω
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?
4
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?
Slip frequency
What happens if the air gap in an induction motor is increased?
Speed will reduce
Which type of motor is most suitable for a computer printer drive?
DC motor
Which of the following motors definitely has a permanent rotor?
Synchronous motor
In a DC machine, what do the carbon brushes do?
Reduce commutator wear and aid commutation
What type of converter is an inverter?
DC to AC converter
Which factor does the electrical resistance of a conductor NOT depend on?
Volume of the conductor
How is the energy stored by a capacitor calculated?
$0.5CV^2$
When transforming a 60V voltage source with an internal resistance of 50Ω to a current source, what is the equivalent current source value?
6A
What substance is responsible for slowing down neutrons in a nuclear power plant?
Graphite
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.
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