Q. According to Ohm's Law, if the resistance in a circuit is doubled while keeping the voltage constant, what happens to the current?
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A.
It doubles
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B.
It halves
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C.
It remains the same
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D.
It becomes zero
Solution
According to Ohm's Law, if resistance is doubled while voltage remains constant, the current will be halved.
Correct Answer:
B
— It halves
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Q. For a FET, what is the effect of increasing gate voltage on the drain current?
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A.
Drain current decreases
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B.
Drain current remains constant
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C.
Drain current increases
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D.
Drain current becomes zero
Solution
Increasing the gate voltage in a FET typically increases the drain current, following the principles of Ohm's Law.
Correct Answer:
C
— Drain current increases
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Q. If a diode is forward-biased, what is the expected behavior according to Ohm's Law?
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A.
It behaves like an open circuit
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B.
It behaves like a short circuit
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C.
It has infinite resistance
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D.
It has zero voltage drop
Solution
When a diode is forward-biased, it allows current to flow, behaving like a short circuit, which means it has very low resistance.
Correct Answer:
B
— It behaves like a short circuit
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Q. In a BJT, if the base current is increased, what happens to the collector current according to Ohm's Law?
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A.
It decreases
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B.
It remains constant
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C.
It increases
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D.
It becomes zero
Solution
In a BJT, increasing the base current leads to an increase in collector current, following the principle of current amplification.
Correct Answer:
C
— It increases
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Q. In a FET, what does the gate voltage control?
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A.
The drain current
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B.
The source voltage
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C.
The gate current
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D.
The output power
Solution
In a FET, the gate voltage controls the drain current, allowing for modulation of the current flow.
Correct Answer:
A
— The drain current
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Q. In a rectifier circuit, what happens to the output voltage when the input AC voltage is at its peak?
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A.
Output voltage is zero
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B.
Output voltage is equal to the peak input voltage
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C.
Output voltage is half the peak input voltage
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D.
Output voltage is negative
Solution
In a rectifier circuit, the output voltage at peak input AC voltage is equal to the peak input voltage, following Ohm's Law.
Correct Answer:
B
— Output voltage is equal to the peak input voltage
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Q. In a small-signal model, what does the transconductance (gm) represent?
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A.
The change in output voltage per change in input current
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B.
The change in output current per change in input voltage
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C.
The change in input voltage per change in output current
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D.
The change in input current per change in output voltage
Solution
Transconductance (gm) represents the change in output current per change in input voltage in a small-signal model.
Correct Answer:
B
— The change in output current per change in input voltage
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Q. What is the effect of increasing resistance in a circuit while keeping voltage constant according to Ohm's Law?
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A.
Current increases
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B.
Current decreases
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C.
Voltage increases
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D.
Power increases
Solution
According to Ohm's Law, if resistance increases while voltage remains constant, the current will decrease.
Correct Answer:
B
— Current decreases
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Q. What is the formula for calculating the total resistance in a series circuit?
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A.
R_total = R1 + R2 + R3
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B.
R_total = R1 x R2 x R3
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C.
R_total = R1 / R2 / R3
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D.
R_total = R1 - R2 - R3
Solution
In a series circuit, the total resistance is the sum of all individual resistances, R_total = R1 + R2 + R3.
Correct Answer:
A
— R_total = R1 + R2 + R3
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Q. What is the output voltage of an ideal op-amp when the input voltage is zero?
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A.
Zero volts
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B.
Equal to the supply voltage
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C.
Equal to the input voltage
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D.
Infinite volts
Solution
An ideal op-amp will output zero volts when the input voltage is zero, consistent with Ohm's Law.
Correct Answer:
A
— Zero volts
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Q. What is the primary function of an operational amplifier (op-amp) in a circuit?
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A.
To amplify voltage
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B.
To rectify current
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C.
To switch signals
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D.
To store energy
Solution
The primary function of an operational amplifier (op-amp) is to amplify voltage signals.
Correct Answer:
A
— To amplify voltage
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Q. What is the typical voltage drop across a silicon diode when it is conducting?
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A.
0.1V
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B.
0.3V
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C.
0.7V
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D.
1.5V
Solution
A silicon diode typically has a forward voltage drop of about 0.7V when it is conducting.
Correct Answer:
C
— 0.7V
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Q. What is the unit of resistance in Ohm's Law?
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A.
Volts
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B.
Amperes
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C.
Ohms
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D.
Watts
Solution
The unit of resistance in Ohm's Law is Ohms, symbolized by the Greek letter Omega (Ω).
Correct Answer:
C
— Ohms
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Q. What type of rectifier allows current to flow in only one direction?
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A.
Zener rectifier
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B.
Half-wave rectifier
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C.
Full-wave rectifier
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D.
Bridge rectifier
Solution
A half-wave rectifier allows current to flow in only one direction, blocking the reverse current.
Correct Answer:
B
— Half-wave rectifier
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Showing 1 to 14 of 14 (1 Pages)