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Browse complete papersIf a coil with 100 turns has a flux of 0. 05 Wb when a current of 2 A flows through it, what is its self-inductance?
10H
250H
Correct answer
10H
A toroidal core has a mean circumference of 30cm, a cross-sectional area of 2cm\(^2\), and a relative permeability of 1000. A coil with 500 turns is wound on the core. What is the reluctance of the magnetic circuit?
Correct answer
What is the ripple frequency of a full-wave rectifier with a 50 Hz input signal?
200 Hz
25 Hz
50 Hz
100 Hz
Correct answer
200 Hz
In a half-wave rectifier with a filter capacitor, what is the effect of increasing the value of the capacitor?
The ripple voltage increases
The ripple frequency increases
The ripple voltage decreases
The DC output voltage decreases
Correct answer
The ripple voltage increases
What is the primary purpose of Thevenin’s theorem?
To determine the current flowing through a short circuit
To find the maximum power transfer to a load
To simplify a complex circuit to a single voltage source and a single series resistor
To find the voltage across an open circuit
Correct answer
To determine the current flowing through a short circuit
What is the primary purpose of Norton’s theorem?
To find the maximum power that can be delivered to a load
To simplify a complex circuit to a single current source and a single parallel resistor
To find the resistance of the circuit with all sources turned on
To find the voltage across an open circuit
Correct answer
To find the maximum power that can be delivered to a load
A Norton equivalent circuit has an IN of 10 A and an RN of \(5\Omega\). If a \(5\Omega\) load is connected, what is the current through the load?
2 A
5 A
0 A
10 A
Correct answer
2 A
When can you use the voltage divider rule to find the Thevenin voltage \((V_{th})\)?
When the circuit is short-circuited
When the circuit contains only a single voltage source and resistors in series
When the circuit contains dependent sources
When the circuit has multiple voltage sources
Correct answer
When the circuit is short-circuited
An alternating current has a waveform such that it has a value of \(I_m\) for half a cycle and zero for the next half. What is the average value of this waveform?
\(I_m\)
Correct answer
An AC voltage is given by \(v(t)=200 \sin(377t)\) V. What is the RMS value of the voltage?
200 v
Correct answer
200 v