Semiconductor Electronics Test
A 3-ohm load is coupled to a transistor amplifier through a step-down transformer. If the D.C resistance of the primary winding is 300Ω and the output resistance of the amplifier is 3KΩ, what shoul...
A D.C milliammeter connected to a half-wave rectifier supplying a maximum current of 10mA will read _____.
A P-type material is _____.
A reversed biased P-N junction has a resistance of the order of _____.
A three-stage amplifier has a first-stage voltage gain of 100, a second stage voltage gain of 200 and a third stage gain of 400. The total voltage gain in db will be _____.
A transistor amplifier has 4v,2mA as the operating point. For faithful amplification, the collector current due to signal alone should not exceed _____.
A triac can pass a portion of _____.
A vacuum tube conducts current _____.
A varactor diode can function as a variable capacitor with a________ forward bias.
According to the Barkhausen criterion for oscillators_______. A – open loop gain β – feed back factor
An :FET is a _____.
An A.C supply of 230v is applied to a half wave rectifier circuit through a transformer of turn ratio 10:1. Its D.C voltage output will be _____.
An FET has ________ temperature co-efficient of resistance.
An FET has the following parameters IDSS = 32mA , VGS ( off ) = -8V , VGS = -4.5V. What will be the drain current?
An SCR combines the features of_____.
An SCR is a solid state equivalent of a _____.
At parallel resonance, a tuned circuit offers an impedance of _____.
For an R-C phase shift oscillator , the frequency of oscillation will be given as _____.
For faithful amplification, VBE must not fall below _____.
For good stabilization of the operating point in a voltage divider bias, the current I, flowing through potential dividers R1 and R2, should be equal to or greater than _____. (IB-base current)
Hartley oscillator is _____.
If a circuit of full-wave centre-tapped rectifier with capacitor filter employs a load RL = 100Ω, and C = 1050µF and the frequency is 50HZ , what would be the ripple factor?
If in a transistor , Ic = 9.5mA , Ie = 10mA , the value of α will be _____.
If in a transistor IE = 10.5mA , IC = 10mA,the value of β will be _____.
If in a transistor VCB= 4V , VBE = 0.7V, the VCE will be equal to _____.
If the A.C input to a half-wave rectifier has an R.M.S valve of 400/√2 v, the peak inverse voltage will be _____.
If the collector supply voltage is 10v, the collector cut off voltage under D.C conditions will be _____.
If the input to a differentiating circuit is a square wave, the output will be _____.
If the input to an integrating circuit is a square wave, the output will be _____.
If the reverse bias on the gate of an FET is increased , the width of the conducting channel will _____.
In an R-C phase shift oscillator, an R-C network is designed to introduce a phase shift of _____ .
In the collector feedback biasing, β = 57 , RC = 1 kΩ , IB = 60µA and VCB = 4.5V. The value of the stability factor will be _____.
In the d.c. equivalent circuit of a transistor amplifier , the capacitors are regarded as _____.
In the enhancement mode (MOSFET) , conductivity increases _____.
Radio frequencies have their range above _____.
The complementary MOS(CMOS) uses _____.
The ideal value of the stability factor is _____.
The impedance of a parallel tuned circuit at resonance is _____.
The input and output voltages of a CE transistor amplifier are _____.
The maximum efficiency of a full wave rectifier is _____.
The maximum value of AC voltage appearing across the secondary of a transformer in a bridge circuit using a vacuum tube is 400 v. The peak inverse voltage of the diode should be _____.
The most commonly used semiconductor in solid state devices is _____.
The output characteristics of an FET closely resemble the plate characteristics of a________ valve.
The output frequency of a half-wave rectifier is _____.
The overall gain of a multistage amplifier is 140. When negative feedback is applied, the gain is reduced to 17.5. The fraction of the output that is feedback to the input will be _____.
The Q-factor of a parallel tuned circuit is given by _____.
The range of LC oscillators is _____.
The relationship among bandwidth, resonant frequency and Q of a tuned circuit is _____.
The required gain of an amplifier for sustained oscillation in the wein bridge oscillator is _____.
The resonant circuit has ___________ impedance at the resonant frequency.
The slope of the D.C load line of a transistor circuit having a collector load Rc is _____.
The stability factor of a biasing circuit is 10. What does it mean?
The V-I characteristics of a triac in the first and third quadrants are essentially identical to those of _______ in the first quadrant
Tuned amplifiers are generally operated as
Tuned amplifiers are used for the amplification of _____.
Tuning is generally accomplished by varying _____.
Two identical germanium diodes are connected in series opposition. A 10V battery is impressed upon this series arrangement. What will be the voltage across each diode room temperature if the Zener ...
Vacuum tubes are _____.
We have to match a 16-ohm speaker to an amplifier so that the effective load resistance is 10 KΩ. What should be the transformer turn ratio?
What would be the gain of a negative feedback amplifier with an internal gain A=100 and a feedback factor m=0.9?
When a transistor has to act as a switch, it must operate in _____.
When a transistor is driven to saturation, ideally, the Vce is _____.
Which coupling does the final stage of a multistage amplifier use?
Which device has the highest input impedance?
Which of the following conditions must a transistor fulfill to act as an amplifier?
Which of the following configurations of a transistor is preferred as an amplifier?
Which of the following is used to provide current in vacuum tubes?
Which of the following multivibrators is a square wave oscillator?
Which of the following parameters is a measure of a vacuum tube's amplification capability?
Which one of the following is a non-feedback type oscillator?
Which one of the following is Shockley's equation?
Why is the control grid of a tube always held at negative potential W.R.T cathode.?