Explore topic-wise MCQs in Engineering.

A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is

If the rms current through a 6.8 k resistor is 8 mA, the rms voltage drop across the resistor is

The average half-cycle value of a sine wave with a 40 V peak is

A square wave has a period of 60 s. The first odd harmonic is

A 12 k resistor is in series with a 0.02 F capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.30 mA, what is the source voltage expressed in polar form?

A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is

For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is

What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?

In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k. Current flow in the circuit is

A 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycle

When a sine wave has a frequency of 100 Hz in 12 s it goes through

A sawtooth wave has a period of 10 ms. Its frequency is

If the peak of a sine wave is 13 V, the peak-to-peak value is

A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

In the complex plane, the number 4 + j3 is located in the

When the frequency of the source voltage decreases, the impedance of a parallel RC circuit

A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will

A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is

A 24 resistor, an inductor with a reactance of 120 , and a capacitor with a reactance of 120 are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is

If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth

A 90 resistor, a coil with 30 of reactance, and a capacitor with 50 of reactance are in series across a 12 V ac source. The current through the resistor is

A 2 k resistor and a 0.002 F capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is

When the frequency of the voltage applied to a series RC circuit is increased, the phase angle

In a series RC circuit, when the frequency and the resistance are halved, the impedance

What is the angular difference between +j4 and j4?

Find I₁.

Using the mesh current method, find the branch current, IR₁, in the above figure.

In assigning the direction of branch currents,

A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is

A signal with a 400 s period has a frequency of

What is the voltage drop across R₁?

In the complex plane, the number 14 j5 is located in the

A 15 resistor, a 220 H coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?

A 12 resistor, a 40 F capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is

A positive angle of 30 is equivalent to a negative angle of

In a series RC circuit, 12 V_(rms) is measured across the resistor and 15 V_(rms) is measured across the capacitor. The rms source voltage is

How many degrees are there in /3 rad?

One sine wave has a positive-going zero crossing at 15 and another sine wave has a positive-going zero crossing at 55 . The phase angle between the two waveforms is

To produce an 800 Hz sine wave, a four-pole generator must be operated at

Find I₂.

The winding resistance of a coil can be increased by

What is the current through R₂?

The expansion method for evaluating determinants is

The first row of a certain determinant has the numbers 10 and 6. The second row has the numbers 3 and 5. The value of this determinant is

What is the voltage drop across R₃?

The branch current method uses

The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is

Two inductors, L₁ and L₂, are in parallel. L₁ has a value of 25 H and L₂ a value of 50 H. The parallel combination is in series with L₃, a 20 H coil. The entire combination is across an ac source of 60 V_rms at 300 kHz. The total rms current is