The layer(s) of the skin that is/are affected by a third-degree burn would be …
A - NSC Electrical Technology Electronics - Question 1 - 2022 - Paper 1
Question 1
The layer(s) of the skin that is/are affected by a third-degree burn would be …
A. The outer layer.
B. The second layer.
C. All layers of the skin.
D. None of the ab... show full transcript
Worked Solution & Example Answer:The layer(s) of the skin that is/are affected by a third-degree burn would be …
A - NSC Electrical Technology Electronics - Question 1 - 2022 - Paper 1
Step 1
The layer(s) of the skin that is/are affected by a third-degree burn would be …
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Answer
The correct answer is C. All layers of the skin. A third-degree burn affects the outer layer (epidermis) as well as deeper tissues.
Step 2
The power factor in an RLC series circuit will be lagging if VL …
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Answer
The correct answer is A. Is greater than VC. In a lagging power factor scenario, the voltage across the inductor is greater than the voltage across the capacitor.
Step 3
A circuit has a resistance of R ohm, inductance of L henry and a capacitance of C farad connected in series. The power factor of the circuit will be uniquely (1) when …
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Answer
The correct answer is A. XL is less than XC. This indicates capacitive behavior, giving a leading power factor.
Step 4
Which ONE of the following conditions exists in a resonant parallel RLC circuit?
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Answer
The correct answer is B. The impedance is maximum. At resonance, the impedance reaches its peak value.
Step 5
The … is a device that relies on the creation of an electric field within the channel to control current flow.
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Answer
The correct answer is C. Field-effect transistor. This device uses an electric field to control the flow of current.
Step 6
When applying a signal to the inverting input of an op amp, phase shift is achieved by the …
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Answer
The correct answer is D. Unity-gain frequency. This is the frequency at which the phase lag of the amplifier becomes zero.
Step 7
Negative feedback in an op amp …
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Answer
The correct answer is B. Decreases the output impedance and the bandwidth. Negative feedback helps stabilize the gain and reduces distortion.
Step 8
Open-loop gain with reference to op amps is when …
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Answer
The correct answer is B. No feedback resistor is connected from the output to the input. This is the mode in which the op amp has the highest gain.
Step 9
When a triangular waveform is applied to the input of a differentiator, the output waveform will be an …
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Answer
The correct answer is B. Inverted triangular waveform. The differentiator inverts and shapes the input waveform.
Step 10
The basic circuit of a passive RC differentiator is a …
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Answer
The correct answer is A. Capacitor in series with the input and a resistor in parallel with the output. This arrangement differentiates the input signal.
Step 11
In a class C amplifier, the output collector current will flow through the transistor for … of the input cycle.
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Answer
The correct answer is D. Less than 180º. This type of amplifier operates for less than half of the cycle.
Step 12
The operation of a relaxation oscillator is based on …
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Answer
The correct answer is A. The charging and discharging of a capacitor. This is the fundamental working principle of relaxation oscillators.
Step 13
For an oscillator to maintain oscillation, the gain must be …
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Answer
The correct answer is C. Greater than 1. This condition is necessary for sustained oscillations.
Step 14
A bipolar junction transistor class B push-pull amplifier with no transformer coupling uses …
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Answer
The correct answer is A. Two NPN transistors. This configuration effectively amplifies the input signal without the need for transformers.
