Q. What is the effect of increasing frequency on the reactance of a capacitor?
A.
Reactance increases
B.
Reactance decreases
C.
Reactance remains constant
D.
Reactance becomes zero
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Solution
The reactance (Xc) of a capacitor decreases with increasing frequency, calculated as Xc = 1 / (2πfC), where f is the frequency and C is the capacitance.
Correct Answer:
B
— Reactance decreases
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Q. What is the effect of increasing the frequency on a transformer's size?
A.
Increases size
B.
Decreases size
C.
No effect
D.
Depends on the load
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Solution
Increasing the frequency allows for a smaller transformer size due to reduced core losses.
Correct Answer:
B
— Decreases size
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Q. What is the effect of increasing the frequency on the gain of an operational amplifier?
A.
Gain increases
B.
Gain decreases
C.
Gain remains constant
D.
Gain becomes zero
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Solution
As frequency increases, the gain of an operational amplifier typically decreases due to bandwidth limitations.
Correct Answer:
B
— Gain decreases
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Q. What is the effect of increasing the frequency on the size of a transformer?
A.
Increases size
B.
Decreases size
C.
No effect
D.
Depends on the load
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Solution
Increasing the frequency allows for a smaller transformer size due to reduced core losses.
Correct Answer:
B
— Decreases size
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Q. What is the effect of increasing the gain in a closed-loop system?
A.
Increases stability
B.
Decreases stability
C.
No effect on stability
D.
Increases steady-state error
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Solution
Increasing the gain in a closed-loop system can lead to decreased stability, potentially causing oscillations or instability.
Correct Answer:
B
— Decreases stability
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Q. What is the effect of increasing the gain in a proportional controller?
A.
Increases stability
B.
Decreases stability
C.
No effect on stability
D.
Increases steady-state error
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Solution
Increasing the gain in a proportional controller can lead to decreased stability and potential oscillations.
Correct Answer:
B
— Decreases stability
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Q. What is the effect of increasing the gain of an operational amplifier?
A.
Increased bandwidth
B.
Decreased bandwidth
C.
No effect on bandwidth
D.
Increased input impedance
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Solution
Increasing the gain of an operational amplifier typically decreases its bandwidth due to the gain-bandwidth product.
Correct Answer:
B
— Decreased bandwidth
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Q. What is the effect of increasing the length of a transmission line on its impedance?
A.
Impedance decreases
B.
Impedance remains constant
C.
Impedance increases
D.
Impedance fluctuates
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Solution
Increasing the length of a transmission line increases its impedance due to the longer path for current flow.
Correct Answer:
C
— Impedance increases
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Q. What is the effect of increasing the load on a transformer?
A.
Increases efficiency
B.
Decreases efficiency
C.
No effect on efficiency
D.
Increases voltage output
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Solution
Increasing the load on a transformer can lead to increased losses, thus decreasing efficiency.
Correct Answer:
B
— Decreases efficiency
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Q. What is the effect of increasing the proportional gain in a PID controller?
A.
Increases the rise time.
B.
Decreases the overshoot.
C.
Increases the steady-state error.
D.
Decreases the system's stability.
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Solution
Increasing the proportional gain can lead to decreased stability, potentially causing oscillations or instability in the system.
Correct Answer:
D
— Decreases the system's stability.
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Q. What is the effect of increasing the transmission line length on its resistance?
A.
Resistance decreases
B.
Resistance remains constant
C.
Resistance increases
D.
Resistance fluctuates
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Solution
As the length of the transmission line increases, its resistance also increases proportionally.
Correct Answer:
C
— Resistance increases
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Q. What is the effect of increasing the transmission line length on the voltage drop?
A.
Voltage drop decreases
B.
Voltage drop remains constant
C.
Voltage drop increases
D.
Voltage drop becomes negligible
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Solution
As the transmission line length increases, the voltage drop also increases due to the resistance and reactance of the line.
Correct Answer:
C
— Voltage drop increases
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Q. What is the effect of negative feedback in an operational amplifier circuit?
A.
Increases gain
B.
Decreases gain
C.
Stabilizes gain
D.
Reverses phase
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Solution
Negative feedback stabilizes the gain of an operational amplifier and improves linearity.
Correct Answer:
C
— Stabilizes gain
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Q. What is the effect of negative feedback on the bandwidth of an operational amplifier?
A.
Increases bandwidth
B.
Decreases bandwidth
C.
No effect
D.
Depends on the configuration
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Solution
Negative feedback in an operational amplifier increases the bandwidth of the amplifier.
Correct Answer:
A
— Increases bandwidth
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Q. What is the effect of temperature on the forward voltage drop of a diode?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
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Solution
As temperature increases, the forward voltage drop of a diode typically decreases.
Correct Answer:
B
— It decreases
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Q. What is the effect of temperature on the forward voltage drop of a silicon diode?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies randomly
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Solution
The forward voltage drop of a silicon diode decreases with an increase in temperature due to increased carrier activity.
Correct Answer:
B
— Decreases with temperature
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Q. What is the effect of water content on the shear strength of clay soils?
A.
Increases shear strength
B.
Decreases shear strength
C.
No effect
D.
Varies with soil type
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Solution
Increased water content generally decreases the shear strength of clay soils due to reduced effective stress.
Correct Answer:
B
— Decreases shear strength
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Q. What is the effect of water table on the effective stress in soil?
A.
Increases effective stress
B.
Decreases effective stress
C.
No effect
D.
Increases total stress
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Solution
The presence of a water table decreases the effective stress in soil due to the buoyant effect of water.
Correct Answer:
B
— Decreases effective stress
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Q. What is the energy band gap in semiconductors?
A.
The energy required to free an electron
B.
The energy of the conduction band
C.
The energy of the valence band
D.
The energy lost during conduction
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Solution
The energy band gap in semiconductors is the energy required to free an electron from the valence band to the conduction band.
Correct Answer:
A
— The energy required to free an electron
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Q. What is the equivalent capacitance of two capacitors in series, C1 = 6μF and C2 = 3μF?
A.
2μF
B.
4μF
C.
1μF
D.
9μF
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Solution
The formula for equivalent capacitance in series is 1/C_eq = 1/C1 + 1/C2. Thus, 1/C_eq = 1/6 + 1/3 = 1/2, so C_eq = 2μF.
Correct Answer:
A
— 2μF
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Q. What is the equivalent impedance (Z) of a 4Ω resistor in series with a 3Ω resistor?
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Solution
Z = R1 + R2 = 4Ω + 3Ω = 7Ω.
Correct Answer:
D
— 7Ω
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Q. What is the equivalent impedance (Z) of a circuit with a 3Ω resistor and a 4Ω inductor in series at a frequency where the inductive reactance is 4Ω?
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Solution
Z = R + jX = 3Ω + j4Ω; |Z| = √(3^2 + 4^2) = 5Ω.
Correct Answer:
B
— 7Ω
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Q. What is the equivalent impedance of a resistor (R) in series with an inductor (L) at a frequency (f)?
A.
Z = R + jωL
B.
Z = R - jωL
C.
Z = R + jL
D.
Z = R - jL
Show solution
Solution
The impedance of a resistor in series with an inductor is given by Z = R + jωL, where ω = 2πf.
Correct Answer:
A
— Z = R + jωL
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Q. What is the equivalent Norton current for a circuit with a 12V source and a 4Ω resistor?
A.
3 A
B.
4 A
C.
6 A
D.
12 A
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Solution
Norton current I_N = V / R = 12V / 4Ω = 3 A.
Correct Answer:
A
— 3 A
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Q. What is the equivalent resistance of a 5 ohm and a 10 ohm resistor in series?
A.
15 ohms
B.
5 ohms
C.
10 ohms
D.
50 ohms
Show solution
Solution
In series, the total resistance is the sum of the individual resistances: R_total = R1 + R2 = 5 ohms + 10 ohms = 15 ohms.
Correct Answer:
A
— 15 ohms
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Q. What is the equivalent resistance of two resistors in parallel, R1 = 4 ohms and R2 = 6 ohms?
A.
2.4 ohms
B.
10 ohms
C.
24 ohms
D.
1.5 ohms
Show solution
Solution
The equivalent resistance for resistors in parallel is given by 1/R_eq = 1/R1 + 1/R2, which results in R_eq = 2.4 ohms.
Correct Answer:
A
— 2.4 ohms
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Q. What is the equivalent resistance of two resistors in parallel, R1 = 6Ω and R2 = 3Ω?
A.
2Ω
B.
3Ω
C.
4Ω
D.
1.5Ω
Show solution
Solution
The formula for equivalent resistance in parallel is 1/R_eq = 1/R1 + 1/R2. Thus, 1/R_eq = 1/6 + 1/3 = 1/2, so R_eq = 2Ω.
Correct Answer:
A
— 2Ω
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Q. What is the equivalent resistance of two resistors, 3Ω and 6Ω, in parallel?
A.
2Ω
B.
4Ω
C.
1.5Ω
D.
9Ω
Show solution
Solution
The formula for equivalent resistance in parallel is 1/R_eq = 1/R1 + 1/R2. Thus, 1/R_eq = 1/3 + 1/6 = 1/2, so R_eq = 2Ω.
Correct Answer:
B
— 4Ω
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Q. What is the equivalent resistance of two resistors, 4 ohms and 6 ohms, in series?
A.
10 ohms
B.
24 ohms
C.
2.4 ohms
D.
0.67 ohms
Show solution
Solution
In series, the equivalent resistance is R_total = R1 + R2 = 4 ohms + 6 ohms = 10 ohms.
Correct Answer:
A
— 10 ohms
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Q. What is the equivalent resistance of two resistors, 4Ω and 6Ω, in series?
A.
10Ω
B.
24Ω
C.
2.4Ω
D.
0.67Ω
Show solution
Solution
In series, the equivalent resistance is simply the sum of the resistances: 4Ω + 6Ω = 10Ω.
Correct Answer:
A
— 10Ω
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