1.
Which of the following statements is false for a Zener diode voltage rated as “VZ”?
Correct Answer
B. Forward breakdown occurs at VZ
Explanation
The speed limit on 2 lane highways with a posted speed limit of 55 mph or higher is increased by 10 mph when the driver is lawfully passing another vehicle in the same direction.
2.
After cut-in voltage AC resistance of the diode:
Correct Answer
B. Decreases exponentially
Explanation
Global positioning and other navigation systems may now be mounted or located near the bottom-most portion of the windshield.
3.
Determine DC resistance of a diode described by the characteristic graph at ID = 10mA.
Correct Answer
A. 90 Ω
4.
Which type of circuit is given in the diagram?
Correct Answer
B. Clamper
Explanation
The circuit shown in the diagram is a clamper circuit. A clamper circuit is used to shift the DC level of a signal without changing its shape. It consists of a diode, a capacitor, and a resistor. In this circuit, the diode and capacitor are used to clamp the output signal to a certain DC level. This allows the output signal to be shifted up or down, depending on the polarity of the diode. Therefore, the correct answer is Clamper.
5.
Negative resistance is incorporated in oscillator for____________
Correct Answer
A. Sustained oscillation
Explanation
Negative resistance is incorporated in an oscillator for sustained oscillation. Negative resistance is a property where the current decreases as the voltage increases. In an oscillator, negative resistance compensates for the energy losses in the circuit, allowing the oscillations to be sustained over time. This ensures that the oscillator continues to produce a stable and continuous output signal.
6.
Which of the following correctly determines the relation between α and β?
Correct Answer
A. Î²=Î±/(1-Î±)
Explanation
The given equation Î²=Î±/(1-Î±) correctly determines the relation between Î± and Î². This equation shows that Î² is equal to Î± divided by (1-Î±). This implies that the value of Î² is dependent on the value of Î±, and as Î± increases, Î² also increases. Conversely, as Î± decreases, Î² also decreases. Therefore, this equation accurately represents the relationship between Î± and Î².
7.
For common emitter configuration, which of the following is the correct relation?
Correct Answer
D. All of the mentioned
Explanation
In a common emitter configuration, all of the mentioned relations are correct. IC < IE indicates that the collector current is less than the emitter current. IC = Î²IB states that the collector current is equal to the current gain Î² times the base current. IC = Î±IE signifies that the collector current is equal to the current gain Î± times the emitter current. Therefore, all of the mentioned relations hold true for the common emitter configuration.
8.
Considering the resistance of the emitter, collector, and base to be Re, Rc, and Rb respectively, which of the following are the correct statements?
Correct Answer
C. Rb > Rc > Re
Explanation
The correct answer is Rb > Rc > Re. This means that the resistance of the base (Rb) is greater than the resistance of the collector (Rc), and the resistance of the collector is greater than the resistance of the emitter (Re). This is because in a transistor, the base-emitter junction is forward biased, allowing current to flow more easily through the base compared to the collector. Therefore, the base has a lower resistance compared to the collector, and the collector has a lower resistance compared to the emitter.
9.
What is one disadvantage of an S-R flip-flop?
Correct Answer
B. It has an invalid state.
Explanation
The disadvantage of an S-R flip-flop is that it has an invalid state. This means that there is a possibility of both the S and R inputs being set to 1 simultaneously, which can result in unpredictable behavior and an undefined output. This can lead to errors and instability in the circuit, making the S-R flip-flop less reliable compared to other flip-flop types.
10.
How many flip-flops are required to make a MOD-32 binary counter?
Correct Answer
C. 5
Explanation
To make a MOD-32 binary counter, we need to have 5 flip-flops. Each flip-flop represents one bit of the binary counter. Since MOD-32 means the counter will cycle through 32 different states before repeating, we need 5 bits to represent all the possible states (2^5 = 32). Therefore, 5 flip-flops are required for a MOD-32 binary counter.
11.
Convert the binary number 1001.00102 to decimal.
Correct Answer
B. 9.125
Explanation
To convert a binary number to decimal, we need to multiply each digit of the binary number by the corresponding power of 2 and sum them up. In this case, we have 1001.0010 as the binary number. The leftmost digit is 1, so we multiply it by 2^3 (8). The next digit is 0, so we skip it. The next digit is also 0, so we skip it. The next digit is 1, so we multiply it by 2^0 (1). The fractional part starts after the decimal point. The next digit is 0, so we skip it. The next digit is 0, so we skip it. The next digit is 1, so we multiply it by 2^-3 (0.125). Adding up all these values, we get 8 + 1 + 0.125 = 9.125. Therefore, the correct answer is 9.125.
12.
The carry propagation can be expressed as ______________
Correct Answer
A. Cp = AB
Explanation
The carry propagation can be expressed as the product of A and B.
13.
The bit sequence 0010 is serially entered (right-most bit first) into a 4-bit parallel-out shift register that is initially clear. What are the Q outputs after two clock pulses?
Correct Answer
C. 1000
Explanation
After the first clock pulse, the bit sequence 0010 is shifted into the shift register, causing the Q outputs to become 0000. After the second clock pulse, the bit sequence is further shifted, resulting in the Q outputs becoming 1000.
14.
Computers operate on data internally in a format.
Correct Answer
C. Parallel
Explanation
Computers operate on data internally in a parallel format. This means that multiple bits of data are processed simultaneously, allowing for faster and more efficient operations. In parallel processing, each bit of data is processed independently and simultaneously by separate processing units. This is in contrast to serial processing, where bits are processed one after another. The use of parallel processing is common in modern computers and allows for tasks to be completed quickly by dividing the workload among multiple processing units.
15.
Another name for a unity gain amplifier is ____________________
Correct Answer
D. Voltage follower
Explanation
A unity gain amplifier is a type of amplifier that has a gain of 1, meaning it does not amplify the input signal. Instead, it produces an output signal that is identical in voltage to the input signal. This type of amplifier is commonly referred to as a voltage follower because it follows the input voltage, providing a high input impedance and low output impedance. Therefore, the correct answer is voltage follower.
16.
When a capacitor is used in place of a resistor in an op-amp network, its placement determines ________________________
Correct Answer
B. Integration or differentiation
Explanation
When a capacitor is used in place of a resistor in an op-amp network, its placement determines whether the circuit will perform integration or differentiation. The placement of the capacitor in the circuit will determine the feedback path and the time constant of the circuit, which in turn determines whether the circuit will integrate or differentiate the input signal. The integration circuit will output the integral of the input signal, while the differentiation circuit will output the derivative of the input signal.
17.
In a low pass butterworth filter, the condition at which f=fH is called __________
Correct Answer
D. All of the mentioned
Explanation
The condition at which f=fH in a low pass Butterworth filter is called the cutoff frequency. It is the frequency at which the filter starts to attenuate the input signal. It is also referred to as the break frequency or corner frequency. All of these terms are used interchangeably to describe the same condition in a low pass Butterworth filter.
18.
Zero crossing detectors is also called as _______________________
Correct Answer
B. Sine to square wave generator
Explanation
Zero crossing detectors are circuits that detect when a signal crosses the zero voltage level. They are commonly used to convert a sine wave signal into a square wave signal. This is because the zero crossing points of a sine wave can be easily detected and used to generate a square wave with the same frequency. Therefore, a zero crossing detector can be referred to as a sine to square wave generator.
19.
Which circuit converts irregularly shaped waveforms to regular shaped waveforms?
Correct Answer
A. Schmitt trigger
Explanation
A Schmitt trigger is a circuit that converts irregularly shaped waveforms to regular shaped waveforms. It is a type of comparator that uses positive feedback to create hysteresis, which allows it to produce a clean and stable output waveform even when the input signal is noisy or distorted. The Schmitt trigger has two threshold voltage levels, one for the rising edge and one for the falling edge, which helps in converting the irregular waveform into a regular waveform. Therefore, the Schmitt trigger is the correct answer for this question.
20.
Number of pins in IC μA741 __________________
Correct Answer
A. 8
Explanation
The correct answer is 8 because the IC μA741 is an 8-pin integrated circuit. Integrated circuits are small electronic devices that contain multiple components, such as transistors, resistors, and capacitors, all integrated onto a single chip. The number of pins in an IC corresponds to the number of external connections that can be made to it. In the case of the μA741 IC, it has 8 pins, allowing for 8 external connections to be made.