Electronics

An n-type semiconductor is made by doping silicon crystal with ______

Cesium coated oxidised silver emits electrons for _______ light.

Practically _______ current flows in a reverse p-n junction.

In LED when an electron combines with a ____ during forward bias conduction, a photon of visible light is emitted.

In which of the following, output is similar to NAND gate if input A=0 and input B = 1.

What is emitted by a hot metal filament in a cathode ray tube?

To convert the Si crystal into p-type semi-conductor, which group element will be doped:

A particle carrying charge of 2e falls through a potential difference of 3.0 V. Calculate the energy required by it

A signal that is applied at the inverting input terminal of an op-amplifier undergo amplification, at the output terminal with a phase shift of:

In certain circuit, if the transistor has a collector current of 10 mA and base current of 50 uA, then the current gain of the transistor is:

If inputs A = 1, B = 0 and output X = 1, then it corresponds to the operation of a:

The net charge on an N-type substance is:

The closed loop gain of OP-AMP depends on:

In transistors, the base region is very thin of the order of:

What is the logic symbol for a NOT Gate?

Which one of the following is the truth table of the NAND gate?

Which one of the following is the Boolean expression of the NAND gate?

If signal is applied to input of non-inverting amplifier through resistance of 100 kΩ, and the value of feedback resistance is 10 kΩ, the gain is:

Output voltage of rectifier is not smooth, it can be made smooth by a circuit known as:

In case of half wave rectification the resistance of diode during negative half of A.C is:

The direction of current through the load resistance of a full-wave rectification circuit:

A diode characteristic curve is a plot between:

The process of converting an alternating current waveform into a direct current waveform is referred to as:

The circuit required for change of AC voltage to DC voltage is called:

Which of the following is NOT a basic operation of Boolean variables:

When the PN junction is reverse-biased, its reverse current is of the order of:

Diode is a/an _ device which can be used for the rectification process.

Full wave rectification is given by:

In an N-type semiconductor, the minority carriers are:

A reverse-biased semiconductor diode acts as:

In an electronic transition, what can the atom not emit?

The conversion of alternating current into direct current is called rectification and circuit is called rectifier. Which component of electronics act as a rectifier?

The efficiency of a full wave rectifier circuit is almost —----- than half wave rectifier circuit.

When AC is converted to DC, the process is called:

The resistance of full wave rectifier is:

Output current of half wave rectifier is:

When the temperature of semiconductor suddenly drops to zero kelvin, thena semiconductor acts as:

The potential difference applied across a diode to reduce depletion layer is:

The process of converting AC into DC is called:

A circuit that converts pulsating voltage of the rectifier to smooth voltage is known as:

The primary purpose of rectification in an electrical circuit is to

In a npn transistor, the current lE that flows in the emitter circuit is:

For half wave rectification, the number of diode needed in a circuit is:

For the positive half cycle i.e., 0 -> T/2, the diode D:

The conversion of A.C into D.C is called rectification and circuit is called rectifier, Which component of electronics acts as a rectifier?

A semi-conductor diode can be used as:

An operational amplifier with an LDR is used as a:

In an npn transistor, the current that flows in the emitter circuit is:

Transformer is used in rectification to _ the supply voltage.

Transistors can be used as

If peak voltage across a full wave rectifier is 20V then Vrms is:

The amplification of the given operational amplifier is

A full wave rectifier passes _ into positive cycles:

Which of the following rectifier uses wheatstone bridge to rectify signal:

How many types of modulations are possible with sinusoidal carrier?

In the case of germanium, the value of potential barrier develops across the depletion region is

Which of the following is not true about LEDs?

Which of the following is false?

When we apply input at the non-inverting input of an operational amplifier then the output appears after:

Which of the following is the proper way to study the sinusoidal waveform of voltage?

What is the output Boolean expression of logic diagram shown in figure below:

Process of generating three dimensional images of objects by using laser beam is called

What will be the energy of the accelerated electron used to produce X-rays when theaccelerating potential is 2 kV?

Which one of the following has the largest energy content?

Which of the following spectra is most typical of the output of an X-ray tube?

Which of the following techniques is the practical application of X-rays?

What is the output of the truth table?

Three NAND gates are connected as shown in the figure.Which of the following logic gates is formed in the connected circuit?

Which one of the following is I-V curve of a junction diode?

Which of the following is the truth table for the logic gate:

If the fundamental logic gates are connected as:

Ripple factor is less in:

Ripple factor of half-wave rectifier is:

In a center tap full-wave rectifier, if Vm is the peak voltage across the secondary coil of the transformer, the maximum voltage across reverse bias is _.

The output voltage of a rectifier is _.

In a full-wave rectifier with input frequency 50H_z, the ripple in the output is mainly of frequency _.

Rectifier is a device which converts _.

A full wave rectifier is operating from 50 H_z mains. Fundamental frequency of ripple will be _.

Ripple factor of half wave rectifier is _.

The use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load _.

If the line frequency is 50 H_z, the output frequency of bridge rectifier is _.

In a rectifier, the larger the value of the shunt capacitor filter, _.

The bridge rectifier is preferred to an ordinary two diode full wave rectifier because _.

Half wave rectifier uses _.

In a centre tap full-wave rectifier, if Vm is the peak voltage across the secondary coil of a transformer, the maximum voltage across the reverse bias is:

Why is the bridge rectifier is preferred to an ordinary two diode full wave rectifier?

Consider a peak rectifier fed by a 60-H_z sinusoid having a peak value Vp = 100 V. Let the load resistance R = 10 kn. Calculate the fraction of the cycle during which the diode is conducting.

The average voltage across the load in terms of Vmax is which of the following?

If an A.C voltage rms value of 10 volts is applied as input of half wave rectifier, then the rms voltage value of D.C output will be

For a half-wave rectifier having diode voltage VD and supply input of V, the diode conducts for π-2θ, where θ is given by:

In which rectifier is the ripple factor less?

Which of the following rectifiers uses a Wheatstone bridge to rectify the signal:

A half wave rectifier is operating from 50 H_z mains. The fundamental frequency of ripple will be:

In which rectifier ripple factor is less?

If the peak voltage in the output of full-wave rectifier is 10V, then the DC component of output voltage is:

The Centre tape rectifier circuit consists of _ diodes.

The output voltage of a rectifier is:

A half wave rectifier is equivalent to

In a half-wave rectification, during the negative cycle of the wave, the diode is:

The average DC voltage across the load in terms of Vmax is:

The maximum efficiency of a full wave rectifier is:

The peak voltage in the output of a half-wave rectifier is 10V so the component of the output voltage is:

A circuit that adds positive or negative D.C. voltage to an input sine wave is called:

The maximum efficiency of a full wave rectifier is _.

Half wave rectifier passes only _.

The ripple factor of the full wave rectifier is:

Half wave rectifier passes only:

Consider a peak rectifier fed by a 60-H_z sinusoid having a peak value Vp = 100 V. Let the load resistance R = 10 kΩ. Calculate the fraction of the cycle during which the diode is conducting.

A full-wave rectifier passes _ into positive cycles.

To get a peak load voltage of 40 volts out of a bridge rectifier, what should be the approximate r.m.s value of the secondary voltage?

Ripple factor is defined as:

The bridge rectifier is preferred to an ordinary two diode full-wave rectifier because?

The rectifier is a device that converts:

The number of diodes in bridge rectifier is:

A full wave rectifier is operating from 50 H_z mains. Fundamental frequency of ripple will be:

The number of diodes in the bridge rectifier is:

The ripple factor of a full-wave rectifier is:

In half-wave rectification, during the negative cycle of the wave, the diode is:

A full wave rectifier uses a load resistor of 1500 ohm. Assume the diodes have Rf = 10 ohm, and Rr = infinity. The voltage applied to the diode is 30V with a frequency of 50H_z. Calculate AC power input.

The most widely used rectifier is:

A full wave rectifier uses a load resistor of 1500 ohms. Assume the diodes have Rf=10 Ohms and Rr= infinite. The voltage applied to the diodes is 30V with a frequency of 50H_z. Calculate the AC power input.

A transformer is used in rectification to _ the supply voltage.

Which of the following is a type of rectifier?

A full wave rectifier uses a load resistor of 1500 Ω. Assume the diodes have Rf= 10 Ω, Rr= ∞. The voltage applied to the diode is 30V with a frequency of 50H_z. Calculate the AC power input.

The ripple factor of a half-wave rectifier is:

The process of converting alternating current into direct current is called:

A half-wave rectifier uses:

Half wave voltage multiplier can provide _ degree of voltage multiplication by cascading diodes and capacitors.

Which of the following is not a type of rectifier?

Gamma rays are attracted towards

In a center tap full wave rectifier, if Vm is the peak voltage across the secondary transformer, the maximum voltage across reverse bias is _.

The maximum efficiency of a half-wave rectifier is:

A diode works in _ bias for first cycle of rectification.

In half wave rectification, the output DC voltage is obtained across the load for:

Transistors can be used as:

If the peak voltage across a full wave rectifier is 20V then Vrms is:

In half-wave rectification, the output DC voltage is obtained across the load for _.

The number of diodes in a center-tapped full-wave rectifier is:

If the input frequency of a full-wave rectifier is 50 H_z, its ripple frequency is:

A half-wave rectifier has diodes:

In a full wave rectifier with an input frequency of 50 H_z, the ripple in the output is mainly of frequency:

To get a peak load voltage of 40V out of a bridge rectifier, what should be the approximate r.m.s value of secondary voltage?

Full wave bridge rectifier uses:

A signal of -80 mV is applied to the inverting terminal of the amplifier while the non-inverting terminal is grounded. The gain of the amplifier is 25 using Rin(R₁) equal to 3 ohms and Rf(R₂) equal to 75 Ohms. What would be the value of the output signal?

The electron volt is the unit of _.

Non-inverting amplifier circuits have:

The basic purpose of the filter is to:

A negligible small current between input terminals of the operational amplifier is because of:

If the temperature of the diode increases, the leakage current will:

In the breakdown region, Zener behaves like a:

The majority of charge carriers in P-type semiconductors are:

A full wave rectifier is operating from 50 H_z mains, the fundamental frequency of ripple will be:

Which option in the following best explains the base of a transistor?

_ is equivalent to AND Gate followed by a NOT Gate.

If both inputs “A” and “B” are ON and the output is also ON. This type of gate is known as:

When the reverse bias of a pn junction diode is increased, a stage comes when the electric field setup is sufficient to rupture the bonds and release a large number of holes and electrons breakdown. This phenomenon is known as:

A semiconductor photodiode is a:

The open-circuit test in a transformer is used to measure: