Explore topic-wise MCQs in Engineering.

The reactive voltages, V_L and V_C, cancel at resonance.

The quality factor (Q) is the ratio of true power to apparent power.

A simple three-phase generator consists of three conductive loops separated by 120 .

Polyphase is characterized by two or more sinusoidal voltages, each having a different phase angle.

In a -connected generator, there is a 120 difference between each line current and the nearest phase current.

Power is measured in a three-phase load by using an ammeter.

Free electrons make current possible.

If 750 A is flowing through 11 k of resistance, what is the voltage drop across the resistor?

At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?

A half-watt is equal to how many milliwatts?

Series aiding is a term sometimes used to describe voltage sources of the same polarity in series.

Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil.

Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.

A filter passes all frequencies.

To tune a parallel resonant circuit to a higher frequency, the capacitance should be

A series resonant circuit is commonly called a tank circuit.

In an ac circuit, power to the load peaks at the frequency at which the load impedance is the complex conjugate of the output impedance.

If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is

In a parallel circuit, the branch with the lowest resistance has the most current.

The superposition theorem is useful for the analysis of single-source circuits.

What is the current through R₂?

Find branch current IR₂.

Third-order determinants are evaluated by the expansion method or by the cofactor method.

Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.

In an RL integrating circuit, the output voltage is taken across the inductor.

A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?

The following resistors (one each) are connected in a series circuit: 470 , 680 , 1 k, and 1.2 k. The voltage source is 20 V. Current through the 680 resistor is approximately

A balanced load is one in which all the impedances are equal.

The quantity 43 10^-3 is the same as

The sum of all the voltage drops around a single closed loop in a circuit is zero.

A phasor represents

When the frequency is decreased, the impedance of a parallel RL circuit

Referring to Problem 23, the reactive power is

When the frequency of the voltage applied to a series RL circuit is decreased, the impedance

In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is

When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle

In an RC low-pass filter, the output voltage is taken across the resistor and the output lags the input voltage.

In an RL low-pass filter, the output voltage is taken across the inductor and the output lags the input.

A band-pass filter rejects all frequencies within a band between a lower and an upper critical frequency and passes all others.

A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.

The output voltage is 63.3% of its maximum at the critical frequencies.

Total current in an RL circuit always lags the source voltage.

At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is

The resistor voltage in an RL circuit is always out of phase with the current.

A filter passes certain frequencies and rejects others.

An RC high-pass filter consists of a 0.2 F capacitor and a 220 resistor. The output is taken across the resistor. The circuit's critical frequency is

In a certain low-pass filter, f_c = 3.5 kHz. Its passband is

The bandwidth of a resonant filter is determined by the quality factor (Q) of the circuit and the resonant frequency.

The phase angle ( ) of a series RL circuit varies directly with frequency.

In an RL circuit, the impedance is determined by both the resistance and the inductive reactance combined.