Explore topic-wise MCQs in Engineering.

What does Faraday's law concern?

When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:

A 24 V peak source is connected across a 900 H inductor. If the frequency of the source is 22 kHz, what is the reactive power?

What will happen when an inductor's magnetic field collapses?

With a square wave input, an RL differentiator circuit with an output across the inductor will produce what type of waveform?

If the primary of a 4:1 turns transformer dissipates 5 W, what is the secondary power?

During a current change, the ability of a conductor to produce counter emf within itself is called:

What happens when moving expanding lines of force encounter a conductor?

You could decrease the time constant of an RL circuit by

Indication of transformer primary and secondary voltage relationships is accomplished by:

What voltage will the capacitor charge up to in the given circuit for the single input pulse shown?

A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 load. What is the efficiency of the transformer?

The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?

Increasing the number of turns of wire on the secondary of a transformer will

What is the turns ratio of the transformer needed to match a 1 k source resistance to a 160 load?

In the given circuit, what will the voltage be across R₃ 25 s after the switch is moved to position 2?

The electrical energy consumed by a coil is stored in the form of:

What is magnetic flux?

As current travels within a conductor:

What type of device consists of a coil with a moveable iron core?

What is hysteresis?

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

Which electromagnetic device has a flexible cone?

What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m², and a permeability of 2500 Wb/At m?

The unit of flux density is known as

What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?

Which of the following is the reference vector for parallel RC circuits?

The Hall effect

"Series" and "parallel" as applied to dc motors refer to

In an ac circuit, a capacitor and an output resistor are connected in series with an ac signal. What filter action will be the result?

How long would it take the capacitor in the given circuit to completely charge if the switch was in position 1?

An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant?

What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant?

The strength of an electric field at a given point is proportional to the potential difference on the plates and inversely proportional to the:

For a given charge difference, electrostatic field strength varies according to:

What is the reactive power?

A practical capacitor

The material used between the plates of a capacitor is called its:

When a circuit consists of a capacitor and a resistor in series with a voltage source, and the voltage across the resistor is zero, then the capacitor is:

Which material has the highest dielectric strength?

What is the dc charging/discharging time constant for the circuit?

Power stored from the source and then returned to the source is called:

Capacitor value markings are usually:

A source voltage across a capacitor will:

A capacitor's rate of charge is considered:

When a 4.7 F capacitor is connected to a 1 kHz source, what is its capacitive reactance?

What is the total capacitance?

What is wrong with a leaky capacitor?

If the dielectric constant of a capacitor is decreased, then its capacitance will:

What is the dielectric constant for ceramic?