1.
A string of five series resistors is connected across a 6 V battery. Zero voltage is measured across all resistors except R3. The voltage across R3 is
Correct Answer
D. 6 V
Explanation
In a series circuit, the total voltage across the resistors is equal to the voltage of the battery. Since zero voltage is measured across all resistors except R3, it means that the voltage drop occurs only across R3. Therefore, the voltage across R3 is equal to the total voltage of the battery, which is 6 V.
2.
When a fourth resistor is connected in series with three resistors, the total resistance
Correct Answer
A. Increases
Explanation
When a fourth resistor is connected in series with three resistors, the total resistance increases. This is because when resistors are connected in series, their resistances add up. Adding a fourth resistor means there is more resistance in the circuit, resulting in an overall increase in total resistance.
3.
When one of three series resistors is removed from a circuit and the circuit is reconnected, the current
Correct Answer
A. Increases
Explanation
When one of the three series resistors is removed from a circuit and the circuit is reconnected, the current increases. This is because when a resistor is removed, the total resistance in the circuit decreases. According to Ohm's Law (V = IR), if the resistance decreases and the voltage stays the same, the current must increase to maintain the same voltage-current relationship. Therefore, removing a resistor from a circuit will result in an increase in current.
4.
There are five resistors in a given series circuit and each resistor has 6 V dropped across it. The source voltage
Correct Answer
A. Is 30 V
Explanation
In a series circuit, the total voltage across the resistors is equal to the sum of the voltage drops across each resistor. Since each resistor has 6 V dropped across it and there are five resistors, the total voltage across the resistors is 6 V + 6 V + 6 V + 6 V + 6 V = 30 V. Therefore, the source voltage in this circuit is 30 V.
5.
The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates
Correct Answer
D. 3 W
Explanation
The answer of 3 W is correct because it is stated in the question that the total power in the circuit is 12 W. Since there are four equal-value series resistors, each resistor must dissipate an equal amount of power. Therefore, if the total power is 12 W, and there are four resistors, each resistor must dissipate 12 W divided by 4, which is 3 W.
6.
All the voltage drops and the source voltage added together in a series circuit is equal to
Correct Answer
D. Zero
Explanation
In a series circuit, the voltage drops across each component add up to equal the source voltage. This means that the sum of all the voltage drops and the source voltage is equal to the source voltage itself. Therefore, the correct answer is zero.
7.
If a 6 V and a 9 V source are connected series aiding, the total voltage is
Correct Answer
D. 15v
Explanation
When two voltage sources are connected in series aiding, their voltages add up. In this case, the 6 V and 9 V sources are connected in series aiding, so the total voltage would be the sum of these two voltages, which is 15 V.
8.
Five resistors are connected in a series and there is a current of 3 A into the first resistor. The amount of current into the second resistor is
Correct Answer
B. 3A
Explanation
In a series circuit, the current remains the same throughout. Therefore, the amount of current into the second resistor will also be 3A.
9.
If a 24 V and a 6 V battery are series opposing, the total voltage is
Correct Answer
A. 18v
Explanation
When two batteries are connected in series opposing, it means that their positive terminals are connected to each other and their negative terminals are connected to each other. In this case, the 24 V battery and the 6 V battery are connected in series opposing. When batteries are connected in this way, the total voltage is equal to the difference between the voltages of the two batteries. So, the total voltage in this case would be 24 V - 6 V = 18 V.
10.
To measure the current out of the second resistor in a circuit consisting of four resistors in series, an ammeter can be placed
Correct Answer
A. At any point
Explanation
In a series circuit, the current remains the same at any point. This is because there is only one path for the current to flow through, and the same amount of current passes through each component. Therefore, placing an ammeter at any point in the circuit will measure the same current flowing through the second resistor.
11.
What determines the total resistance in a series circuit?
Correct Answer
A. The sum of the resistors
Explanation
In a series circuit, the total resistance is determined by the sum of the resistors. This is because in a series circuit, the current flowing through each resistor is the same, and the total resistance is the cumulative effect of all the resistors in the circuit. Therefore, to find the total resistance, we add up the individual resistances of all the resistors in the series circuit.
12.
A series circuit schematic is recognized because all the components are connected:
Correct Answer
A. End to end in a "string"
Explanation
In a series circuit, all the components are connected in a single path, one after the other, like a string. This means that the current flows through each component in the same direction, and if one component fails, the entire circuit will be broken. Therefore, the correct answer is "end to end in a 'string'."
13.
If series resistors dissipate 16 mW, 107 mW, 146 mW, and 243 mW, what is the total power consumed by the circuit?
Correct Answer
C. 512 mW
Explanation
The total power consumed by a circuit with series resistors can be found by adding up the power dissipated by each resistor. In this case, the power dissipated by the resistors is 16 mW, 107 mW, 146 mW, and 243 mW. Adding these values together gives a total power consumption of 512 mW.
14.
If two resistors have the same voltage drop in a series circuit, it means:
Correct Answer
D. They are of equal value
Explanation
If two resistors have the same voltage drop in a series circuit, it means that they are of equal value. In a series circuit, the total voltage is divided among the resistors based on their resistance values. If both resistors have the same voltage drop, it indicates that they have the same resistance value and are therefore of equal value.
15.
With a 900 V source, voltage is divided across 3 series resistors of 300 V, 280 V, and:
Correct Answer
C. 320 V
Explanation
When a voltage source is connected to a series circuit, the total voltage is divided among the resistors based on their individual resistances. In this case, the total voltage is 900 V and it is divided across the three resistors. The first resistor has a voltage drop of 300 V, the second resistor has a voltage drop of 280 V, and the third resistor will have a voltage drop of 320 V. This is because the voltage drop across each resistor is proportional to its resistance. Therefore, the correct answer is 320 V.
16.
When a battery is connected to a series circuit, it delivers current based only upon:
Correct Answer
A. Total resistance
Explanation
When a battery is connected to a series circuit, the amount of current it delivers is determined by the total resistance in the circuit. In a series circuit, the total resistance is the sum of the individual resistances of all the components connected in series. The higher the total resistance, the lower the current delivered by the battery, and vice versa. Therefore, the current delivered by the battery is based solely on the total resistance in the circuit.
17.
Resistance in a series circuit will:
Correct Answer
A. Oppose current
Explanation
In a series circuit, the resistance opposes the flow of current. This means that the resistance restricts the flow of electrons, creating a hindrance to the current. As a result, the resistance causes the current to decrease in magnitude. Therefore, the correct answer is "oppose current".
18.
How will an open resistor affect a series circuit?
Correct Answer
A. No current will flow in the circuit.
Explanation
An open resistor in a series circuit will prevent the flow of current because there is a break in the circuit. When there is an open resistor, the current cannot pass through it and therefore cannot continue to flow through the rest of the circuit. This interruption in the circuit prevents any current from flowing, resulting in no current flowing in the circuit.
19.
Which equation determines individual resistor voltage drop?
Correct Answer
A. I x R
Explanation
The equation I x R determines the individual resistor voltage drop. This equation represents Ohm's Law, where I represents the current flowing through the resistor and R represents the resistance of the resistor. By multiplying the current and resistance values, we can calculate the voltage drop across the resistor.
20.
The voltage drop across a series resistor is proportional to what other value?
Correct Answer
A. Its own resistance
Explanation
The voltage drop across a series resistor is directly proportional to its own resistance. This means that as the resistance of the resistor increases, the voltage drop across it also increases. Conversely, if the resistance decreases, the voltage drop across it decreases as well. This relationship is described by Ohm's Law, which states that the voltage drop (V) across a resistor is equal to the current (I) flowing through it multiplied by its resistance (R), V = I * R. Therefore, the voltage drop across a series resistor is dependent on its own resistance.
21.
With 20 V applied, an 8-ohm resistor is in series with a lamp. When the lamp is removed, what voltage will be read across the lamp socket?
Correct Answer
A. 20v
Explanation
When the lamp is removed, the circuit becomes open and no current flows through the circuit. Therefore, no voltage drop occurs across the 8-ohm resistor or the lamp socket. As a result, the voltage read across the lamp socket will be 0V.
22.
In a series circuit, the voltage measured across a short will be:
Correct Answer
B. Zero volts
Explanation
In a series circuit, the voltage measured across a short will be zero volts. This is because a short circuit provides a path of very low resistance, causing all of the current to flow through the short and bypass the rest of the circuit. As a result, there is no voltage drop across the short circuit itself.
23.
If 5 V and 16 V power supplies are connected in series-opposing, what is the total voltage?
Correct Answer
A. 11v
Explanation
When two power supplies are connected in series-opposing, it means that their positive terminals are connected to each other and their negative terminals are also connected to each other. In this case, the 5 V power supply will create a potential difference of +5 V, while the 16 V power supply will create a potential difference of -16 V. When these two voltages are added together, we get a total voltage of -11 V. Therefore, the correct answer is -11 V.
24.
Given a series circuit containing resistors of different values, which statement is not true?
Correct Answer
D. The voltage drop across each resistor is the same.
Explanation
In a series circuit, the current through each resistor is the same because there is only one path for the current to flow. The sum of the voltage drops across each resistive element will be equal because the total voltage supplied by the source is divided among the resistors. The total resistance is the sum of the value of the resistors because resistors in a series circuit add up to increase the overall resistance. However, the voltage drop across each resistor is not the same because it depends on the resistance value of each resistor. The voltage drop across a resistor is directly proportional to its resistance.
25.
A series circuit current:
Correct Answer
A. Remains the same through each component
Explanation
In a series circuit, the current remains the same through each component because there is only one path for the current to flow. The total resistance in a series circuit is equal to the sum of the individual resistances, but the current remains constant throughout the circuit. This is because the amount of current flowing into one component is equal to the amount of current flowing out of that component, ensuring that the current remains the same throughout the circuit.
26.
A string of resistors in a series circuit will:
Correct Answer
A. Divide the source voltage in proportion to their values
Explanation
In a series circuit, resistors are connected end to end, so the same current flows through each resistor. According to Ohm's Law, the voltage across a resistor is directly proportional to its resistance. Therefore, in a series circuit, the total voltage of the source is divided among the resistors in proportion to their individual values. This is why the correct answer is "divide the source voltage in proportion to their values".
27.
If three resistors of 1.5 kilohms, 470 ohms, and 3300 ohms are in series with a 25-volt source, what is the total circuit current?
Correct Answer
A. 4.7 mA
Explanation
The total circuit current can be calculated using Ohm's Law, which states that current is equal to voltage divided by resistance. In a series circuit, the total resistance is the sum of the individual resistances. Therefore, the total resistance in this circuit is 1.5 kilohms + 470 ohms + 3300 ohms = 4780 ohms. Using Ohm's Law, the total circuit current is 25 volts divided by 4780 ohms, which is approximately 0.0052 amperes or 5.2 mA. Therefore, the correct answer is 4.7 mA.
28.
A short circuit has:
Correct Answer
C. No resistance
Explanation
A short circuit is a connection with no resistance, meaning there is no opposition to the flow of electric current. In a short circuit, the electrical current takes the path of least resistance, bypassing the intended circuit and causing a high flow of current. This can lead to overheating, damage to the circuit, and potentially dangerous situations. Therefore, the correct answer is "no resistance."
29.
Kirchhoff’s voltage law states that:
Correct Answer
A. The sum of the voltage drops in a series circuit is equal to the total applied voltage
Explanation
Kirchhoff's voltage law states that the sum of the voltage drops in a series circuit is equal to the total applied voltage. This means that the voltage across each component in a series circuit adds up to the total voltage supplied by the source. In other words, the sum of the individual voltage drops across resistors, capacitors, or inductors connected in series will always be equal to the voltage supplied by the source. This law is based on the conservation of energy principle and is a fundamental concept in electrical circuit analysis.
30.
An 8-ohm resistor is in series with a lamp. The circuit current is 1 A. With 20 V applied, what voltage is being allowed for the lamp?
Correct Answer
B. 12v
Explanation
In a series circuit, the total voltage is divided among the resistors. The voltage across each component depends on its resistance. In this case, the circuit consists of an 8-ohm resistor and a lamp. Since the total circuit current is 1 A and the resistance of the resistor is 8 ohms, the voltage drop across the resistor can be calculated using Ohm's Law (V = I * R), which gives us 1 A * 8 ohms = 8 V. Therefore, the remaining voltage of 20 V - 8 V = 12 V is being allowed for the lamp.
31.
With a total resistance of 3300 ohms and a 45 V source, if R3 is 1200 ohms, what will be its voltage drop?
Correct Answer
A. 16.36 V
Explanation
The voltage drop across a resistor in a series circuit is directly proportional to its resistance. In this case, R3 has a resistance of 1200 ohms, which is less than the total resistance of the circuit. Therefore, the voltage drop across R3 will be less than the total voltage of 45 V. To calculate the voltage drop, we can use the formula V = IR, where V is the voltage drop, I is the current flowing through the resistor, and R is the resistance. Since the current is the same throughout a series circuit, we can calculate the current by dividing the total voltage by the total resistance: I = V/R = 45 V / 3300 ohms = 0.0136 A. Now, we can calculate the voltage drop across R3: V = IR = 0.0136 A * 1200 ohms = 16.36 V. Therefore, the voltage drop across R3 will be 16.36 V.
32.
If series current doubles, then:
Correct Answer
B. Resistance is halved
Explanation
When the series current doubles, it means that more current is flowing through the circuit. According to Ohm's Law (V = IR), the voltage (V) across a resistor is directly proportional to the current (I) flowing through it. Therefore, if the current doubles, the voltage across the resistor will also double. On the other hand, the resistance (R) in the circuit is inversely proportional to the current. So, if the current doubles, the resistance will be halved.
33.
One of the most common applications of a potentiometer is as an adjustable voltage divider, also known as
Correct Answer
A. Volume control
Explanation
A potentiometer is commonly used as an adjustable voltage divider, allowing the user to control the output voltage by adjusting the position of the wiper along the resistive track. This makes it an ideal component for volume control in audio systems, where the user can adjust the voltage level to control the volume of the output sound.
34.
If the resistance total in a series circuit doubles, current will:
Correct Answer
B. Be halved
Explanation
When the resistance total in a series circuit doubles, the current will be halved. This is because according to Ohm's Law, the current flowing through a circuit is inversely proportional to the total resistance. Therefore, if the resistance doubles, the current will decrease by half.
35.
Power is defined as:
Correct Answer
D. The rate at which work is done
Explanation
Power is a measure of how quickly work is done or energy is transferred. It represents the rate at which work is done, meaning how much work is done per unit of time. It is not just the conversion of energy or the total amount of work done, but specifically the rate at which work is being done. Therefore, the correct answer is "the rate at which work is done".
36.
What is the value of this resistor?
Correct Answer
A. 56k Ohms
Explanation
The value of the resistor is 56k Ohms.
37.
What is the value of the resistor?
Correct Answer
A. 10M Ohms
Explanation
The value of the resistor is 10M Ohms.
38.
This component is
Correct Answer
A. Capacitor
Explanation
Capacitors are electronic components that store electrical energy in an electric field. They consist of two conductive plates separated by an insulating material called a dielectric. When a voltage is applied across the plates, the capacitor charges up and stores energy. Capacitors are commonly used in electronic circuits for various purposes, such as smoothing out voltage fluctuations, filtering signals, and storing energy for later release. Therefore, the correct answer is Capacitor.
39.
This is a
Correct Answer
B. Pushbutton
Explanation
The given options are capacitor, pushbutton, resistor, and IC. The correct answer is pushbutton. A pushbutton is a type of switch that is activated by pressing it. It is commonly used in various electronic devices and appliances to initiate a specific action or function when pressed.
40.
Is a symbol of
Correct Answer
A. LED
Explanation
The correct answer is LED. LED stands for Light Emitting Diode, which is a semiconductor device that emits light when an electric current passes through it. LEDs are commonly used in various electronic devices and lighting applications due to their energy efficiency and long lifespan. Therefore, an LED can be considered as a symbol of modern lighting technology.
41.
Which of the following special symbol allowed in a variable name?
Correct Answer
C. _ (underscore)
Explanation
The underscore (_) symbol is allowed in a variable name.
42.
Which of the following statements should be used to obtain a remainder after dividing 3.14 by 2.1 ?
Correct Answer
B. Rem = fmod(3.14, 2.1);
Explanation
The function fmod(3.14, 2.1) should be used to obtain the remainder after dividing 3.14 by 2.1.
43.
How would you round off a value from 1.66 to 2.0?
Correct Answer
D. Ceil(1.66)
Explanation
The ceil() function is used to round up a value to the nearest whole number. In this case, rounding up 1.66 will result in 2.0.
44.
What are the different types of real data type in C ?
Correct Answer
A. Float, double, long double
Explanation
The different types of real data types in C are float, double, and long double. These data types are used to store decimal numbers with varying levels of precision. Float is a single-precision floating-point number, double is a double-precision floating-point number, and long double is an extended-precision floating-point number. These data types allow for the representation of a wide range of real numbers in C programming.
45.
A float occupies 4 bytes. If the hexadecimal equivalent of these 4 bytes are A, B, C and D, then when this float is stored in memory in which of the following order do these bytes gets stored?
Correct Answer
B. Depends on big endian or little endian architecture
Explanation
The order in which the bytes of a float are stored in memory depends on the big endian or little endian architecture of the system. In big endian architecture, the most significant byte (MSB) is stored first, followed by the next most significant byte, and so on. In little endian architecture, the least significant byte (LSB) is stored first, followed by the next least significant byte, and so on. Therefore, without knowing the specific architecture, it is not possible to determine the order in which the bytes are stored.
46.
What are the types of linkages?
Correct Answer
D. External, Internal and None
Explanation
The types of linkages include external, internal, and none. External linkages refer to connections between a program and other programs or libraries outside of its own code. Internal linkages refer to connections within a program, such as between different functions or variables. None indicates that there are no linkages present in the context of the question.
47.
What will you do to treat the constant 3.14 as a long double?
Correct Answer
B. Use 3.14L
Explanation
To treat the constant 3.14 as a long double, the "L" suffix should be used. This suffix is used to indicate that the constant should be treated as a long double data type.
48.
We want to round off x, a float, to an int value, The correct way to do is
Correct Answer
A. Y = (int)(x + 0.5)
Explanation
To round off a float value to the nearest integer, we can add 0.5 to the float value and then cast it to an int data type. This is because adding 0.5 will ensure that the float value is properly rounded up or down. The correct way to do this is by using the expression "y = (int)(x + 0.5)".
49.
The binary equivalent of 5.375 is
Correct Answer
D. 101.011
Explanation
The binary equivalent of a decimal number can be found by repeatedly multiplying the decimal part by 2 and taking the integer part as the binary digit. In this case, the decimal part of 5.375 is 0.375. Multiplying 0.375 by 2 gives 0.75, with an integer part of 0. Multiplying 0.75 by 2 gives 1.5, with an integer part of 1. Multiplying 0.5 by 2 gives 1, with an integer part of 1. Therefore, the binary equivalent of 5.375 is 101.011.
50.
What will you do to treat the constant 3.14 as a float?
Correct Answer
A. Use 3.14f
Explanation
To treat the constant 3.14 as a float, you can use the suffix "f" after the number. This indicates that the number should be treated as a float data type.