Electrical Engineering

MCQ Problems / Explanations

A semiconductor is formed by ________ bonds.

Last updated: Sat, 30 May

The most commonly used semiconductor is _______.

Last updated: Sat, 30 May

When a pure semiconductor is heated, its resistance______.

Last updated: Sat, 30 May

When a pentavalent impurity is added to a pure semiconductor, it becomes ______.

Last updated: Sat, 30 May

A semiconductor has ________ temperature coefficient of resistance.

Last updated: Sat, 30 May

A semiconductor has generally _______ valence electrons.

Last updated: Sat, 30 May

The strength of a semiconductor crystal comes from _______.

Last updated: Sat, 30 May

Addition of pentavalent impurity to a semiconductor creates many ________.

Last updated: Sat, 30 May

A pentavalent impurity has _______ valance electrons.

Last updated: Sat, 30 May

A trivalent impurity has _______ valance electrons.

Last updated: Sat, 30 May

A hole in a semiconductor is defined as _______.

Last updated: Sat, 30 May

As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ______.

Last updated: Sat, 30 May

In a semiconductor, current condition is due _______.

Last updated: Sat, 30 May

An n-type semiconductor is ________.

Last updated: Sat, 30 May

Addition of trivalent impurity to a semiconductor creates many _______.

Last updated: Sat, 30 May

The impurity level in an extrinsic semiconductor is about ______ of pure semiconductor.

Last updated: Sat, 30 May

A hole and electron in close proximity would tend to _______.

Last updated: Sat, 30 May

The random motion of holes and free electrons due to thermal agitation is called ______.

Last updated: Sat, 30 May

The barrier voltage at a PN junction for germanium is about _______.

Last updated: Sat, 30 May

A reverse biased PN junction has _______.

Last updated: Sat, 30 May

When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on ________.

Last updated: Sat, 30 May

The battery connections required to forward bias a PN junction are _______.

Last updated: Sat, 30 May

In the depletion region of a PN junction, there is a shortage of ________.

Last updated: Sat, 30 May

The leakage current across a PN junction is due to ________.

Last updated: Sat, 30 May

With forward bias to a PN junction, the width of depletion layer ______.

Last updated: Sat, 30 May

At room temperature, an intrinsic semiconductor has _______.

Last updated: Sat, 30 May

At room temperature, an intrinsic silicon crystal acts approximately as ________.

Last updated: Sat, 30 May

In an intrinsic semiconductor, the number of free electrons ________.

Last updated: Sat, 30 May

At absolute temperature, an intrinsic semiconductor has _______.

Last updated: Sat, 30 May

A crystal diode has_____.

Last updated: Sat, 30 May

If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is ______ biased.

Last updated: Sat, 30 May

The forward voltage drop across a silicon diode is about ______.

Last updated: Sat, 30 May

A crystal diode is used as _______.

Last updated: Sat, 30 May

An ideal crystal diode is one which behaves as a perfect ______ when forward biased.

Last updated: Sat, 30 May

The leakage current in a crystal diode is due to ________.

Last updated: Sat, 30 May

The PIV rating of a crystal diode is ______ that of equivalent vacuum diode.

Last updated: Sat, 30 May

The knee voltage of a crystal diode is approximately equal to ______.

Last updated: Sat, 30 May

The DC resistance of a crystal diode is _____ its AC resistance.

Last updated: Sat, 30 May

The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ______.

Last updated: Sat, 30 May

If the temperature of a crystal diode increases, them leakage current _______.

Last updated: Sat, 30 May

If the doping level of a crystal diode is increased, the breakdown voltage _____.

Last updated: Sat, 30 May

When the graph between current through and voltage across a device is a straight line, the device is referred to as...

Last updated: Sat, 30 May

When the crystal diode current is large, the bias is _______.

Last updated: Sat, 30 May

A crystal diode utilities _______ characteristics for rectification.

Last updated: Sat, 30 May

If the doping level in a crystal diode is increased, the width of depletion layer _______.

Last updated: Sat, 30 May

________ Rectifier has the lowest forward resistance.

Last updated: Sat, 30 May

The disadvantage of a half-wave rectifier is that the ________.

Last updated: Sat, 30 May

A crystal diode is a _______ device.

Last updated: Sat, 30 May

When a crystal diode is used as a rectifier the most important consideration is ______.

Last updated: Sat, 30 May

A Zener diode has _______.

Last updated: Sat, 30 May

Mains AC power is connected into DC power for _______.

Last updated: Sat, 30 May

The ripple factor of a half-wave rectifier is _______.

Last updated: Sat, 30 May

The PIV rating of each diode in a bridge rectifier is ______ that of the equivalent centre-tap rectifier.

Last updated: Sat, 30 May

If the PIV rating of a diode is exceeded, ________.

Last updated: Sat, 30 May

A 1000 V power supply would use _______ as a filter capacitor.

Last updated: Sat, 30 May

A half-wave rectifier has an input voltage of 240 V RMS. If the step-down transformer has a turn's ratio of 8:1, wh...

Last updated: Sat, 30 May

There is a need of transformer for ________.

Last updated: Sat, 30 May

For the same secondary voltage, the output voltage from a centre-tap rectifier is ______ than that of bridge rectif...

Last updated: Sat, 30 May

A 10 V power supply would use ________ as filter capacitor.

Last updated: Sat, 30 May

The _______ filter circuit results in the best voltage regulation.

Last updated: Sat, 30 May

The maximum efficiency of a half-wave rectifier is ________.

Last updated: Sat, 30 May

The most widely used rectifier is ________.

Last updated: Sat, 30 May

What kind of device is a resistor?

Last updated: Sat, 30 May

How is a non-conducting diode biased?

Last updated: Sat, 30 May

The bulk resistance of a 1N4001 is

Last updated: Sat, 30 May

The ideal diode is usually adequate when

Last updated: Sat, 30 May

When the graphs of current versus voltage is a straight line the device is referred to as

Last updated: Sat, 30 May

What kind of device is a diode?

Last updated: Sat, 30 May

When the diode current is large, the bias is

Last updated: Sat, 30 May

If N1/N2 = 4 and the primary voltage is 120 V, what is the secondary voltage?

Last updated: Sat, 30 May

In stepdown transformer, which is larger?

Last updated: Sat, 30 May

The voltage out of a bridge rectifier is a

Last updated: Sat, 30 May

What is the peak load voltage in a full-wave rectifier if the secondary voltage is 20 V RMS?

Last updated: Sat, 30 May

A transformer has a turn's ratio of 2:1, what is the peak secondary voltage if 115 V RMS is applied to the primary ...

Last updated: Sat, 30 May

Suppose line voltage may be as low as 105 V RMS or as high as 125 V RMS in a half-wave rectifier. With a 5:1 step-d...

Last updated: Sat, 30 May

If the line voltage is 115 V RMS, a turns ratio of 5:1 means the RMS secondary voltage is closest to

Last updated: Sat, 30 May

We want a peak load voltage 40 V out of a bridge rectifier. What is the approximate RMS value of secondary voltage?

Last updated: Sat, 30 May

What is the peak load voltage out of a bridge rectifier for a secondary voltage of 12.6 V RMS? (Use second approxim...

Last updated: Sat, 30 May

If line frequency is 60 Hz, the output frequency of a half-wave rectifier is

Last updated: Sat, 30 May

With the same secondary voltage and filter, which has the most ripple?

Last updated: Sat, 30 May

If the filtered load current is 10 mA, which of the following has a diode current of 10 mA?

Last updated: Sat, 30 May

The diodes in a bridge rectifier each have a maximum DC current rating of 2 A. This means the DC load current can h...

Last updated: Sat, 30 May

If the secondary voltage increases in a bridge rectifier with a capacitor-input filter, the load voltage will

Last updated: Sat, 30 May

If line frequency is 60 Hz, the output frequency of a bridge rectifier is

Last updated: Sat, 30 May

With the same secondary voltage and filter, which produces the least load voltage?

Last updated: Sat, 30 May

What is the PIV across each diode of a bridge rectifier with a secondary voltage of 20 V RMS?

Last updated: Sat, 30 May

If the filter capacitance is increased, the ripple will

Last updated: Sat, 30 May

A circuit that removes positive or negative parts of a waveform is called a

Last updated: Sat, 30 May

For a clamper circuit to operate properly, its RLC time constant should be

Last updated: Sat, 30 May

An AC supply of 230 V is applied to a half-wave rectifier through a transformer of turns ratio 10:1, the output DC ...

Last updated: Sat, 30 May

An AC supply of 230 V is applied to a bridge rectifier through a transformer of turns ratio 10:1, the output DC vol...

Last updated: Sat, 30 May

Voltage multipliers are circuits best used to produce

Last updated: Sat, 30 May

An AC supply of 230 V is applied to a centered tapped full wave rectifier through a transformer of turns ratio 10:1...

Last updated: Sat, 30 May

An AC supply of 230 V is applied to a bridge rectifier through a transformer of turns ratio 4:1, the PIV rating of ...

Last updated: Sat, 30 May

A Zener diode is used as _______.

Last updated: Sat, 30 May

A Zener diode utilities _______ characteristic for its operation.

Last updated: Sat, 30 May

A zener diode is destroyed if it ________.

Last updated: Sat, 30 May

A zener diode is _______ device.

Last updated: Sat, 30 May

A PN junction that radiates energy as light instead of as heat is called a

Last updated: Sat, 30 May

A Zener diode is always _______ connected.

Last updated: Sat, 30 May

Categories

Related Posts