Explore topic-wise MCQs in Engineering.

With 100 V_ac applied to the primary of a transformer so that it draws 500 mA, what will be the 300 V_ac secondary current?

Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?

When the transformer secondary is not loaded:

When current in an inductor starts to change, it cannot react instantly due to:

What is the approximate time for a complete decay of 400 mA of inductor current, when R = 10 ohms and L = 20 H?

A utility pole transformer used to supply a residential customer with two phases uses:

When a coil collapses the induced circuit current will:

When a rate of one ampere per second causes an induced voltage of one volt, the unit of measure is

When a magnet enters a coil and a voltage is induced, the process is known as:

What term is used to describe the action of magnetic flux from one circuit that cuts across the conductors of another circuit?

Reactance in an inductive circuit will:

A turns ratio of 5 for a transformer implies:

The time difference, or lag, between flux density and magnetizing force is known as:

A magnetic circuit breaker will open to protect equipment only when:

Electromagnetic induction is the generation of:

Inductance is:

Current will cause a magnetic field in a conductor as follows:

Electromagnetism is the:

A magnetic field has:

Which two values are plotted on a B-H curve graph?

What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 V_ac at the secondary?

The four factors determining inductance are the number of turns, coil length, coil area, and:

In a purely inductive circuit,

List three diode packages:

The mimicking of an open/closed switch by a diode allows alternating current to be:

With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?

Which of the following circuits would require the least amount of filtering?

What is wrong with this circuit?

The voltage where current may start to flow in a reverse-biased pn junction is called the

With a 12 V supply, a silicon diode, and a 370-ohm resistor in series, what voltage will be dropped across the diode?

If the frequency of the applied ac signal to a half-wave rectifier is 60 Hz, the frequency of the pulsating dc output will be

What is the peak output voltage for this half-wave rectifier?

Thermal shutdown occurs in an IC regulator if:

The conduction band is closest to the valence band in

DC power should be connected to forward bias a diode as follows:

At any given time in an intrinsic piece of semiconductor material at room temperature

What is the percent of regulation if V_nl = 20 V and V_fl = 19.8 V?

If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is

In a power supply diagram, which block indicates a pulsating dc output?

Providing a constant output regardless of ac input or load resistance changes is the function of a:

When a diode is destroyed it has infinite impedance. When damaged by heat it will probably:

A transformer has

The transformer turns ratio determines

A series RL filter circuit with an output across the inductor will result in what type of filtering?

What is the total inductance in the given circuit?

On a schematic, dashed lines between two vertical coils usually mean the transformer has:

A special transformer used to convert unbalanced signals to balanced signals is the

What is the secondary voltage in the given circuit?

Faraday's law states that the:

A henry value divided by a circuit resistive value provides the: