A 12 V DC source is connected across a 4 Ω resistor. The current through the resistor is:
Circuits
Question · Easy
Two resistors of 6 Ω and 3 Ω are connected in parallel. The equivalent resistance is:
Question · Medium
In a series RLC circuit at resonance, the impedance is:
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A 10 μF capacitor is charged to 100 V. The stored energy is:
Question · Hard
Kirchhoff's Current Law (KCL) states that:
A 60 Hz AC voltage has a peak value of 170 V. Its RMS value is approximately:
The Thevenin equivalent of a linear network consists of:
Three identical resistors each of 12 Ω are connected in a wye (Y) configuration. The resistance between any two line terminals is:
In an AC circuit, the power factor is defined as:
A first-order RC circuit with R = 10 kΩ and C = 100 μF has a time constant τ of:
Using superposition: a 12 V source alone drives 3 mA through a 4 kΩ resistor. A 6 V source alone drives 1.5 mA through the same resistor. With both sources active, the total current is:
A balanced three-phase system has line voltage 400 V. The phase voltage in a wye connection is approximately:
The quality factor Q of a series resonant RLC circuit is approximately:
Nodal analysis is especially convenient when:
A 0.5 H inductor carries a steady DC current of 4 A. The stored energy is:
In a purely inductive AC circuit, the current:
Maximum power transfer to a load occurs when:
An ideal silicon diode has a forward voltage drop of approximately:
Electronics
A full-wave bridge rectifier with 120 V RMS input and ideal diodes produces approximately what peak output voltage (before filtering)?
In an inverting op-amp with R_f = 20 kΩ and R_in = 5 kΩ, the closed-loop voltage gain is:
A MOSFET operates in the saturation (active) region when:
The output of a two-input NAND gate is LOW only when:
A BJT in common-emitter configuration with β = 100 and I_B = 50 μA has collector current approximately:
Zener diodes are primarily used for:
CMOS logic gates dissipate negligible static power because:
A non-inverting op-amp has R₁ = 2 kΩ from inverting input to ground and R₂ = 8 kΩ feedback from output to inverting input. The closed-loop voltage gain is:
A half-wave rectifier with 10 V peak input and a 1 kΩ load resistor has average load current of approximately:
In a common-collector (emitter follower) amplifier, voltage gain is approximately:
An XOR gate output is HIGH when:
The transconductance g_m of a MOSFET relates:
A 7805 linear regulator provides:
Negative feedback in an amplifier generally:
A 4-bit binary counter counts from 0 to:
Schottky diodes are preferred in high-speed switching because they have:
In a balanced three-phase system, the total three-phase real power is:
Power Systems
A 50 MVA, 132/33 kV transformer has approximate rated primary current of:
Per-unit impedance on a common system base is calculated as:
The purpose of a surge arrester on a transmission line is to:
A synchronous generator must be synchronized to the grid before closing the breaker. Matching includes:
For a three-phase fault on a radial system, the fault current is primarily limited by:
An ideal transformer with turns ratio 10:1 (primary:secondary) and 11 kV primary has secondary voltage of:
Negative sequence components in symmetrical components analysis are associated with:
The Saudi Electricity Company (SEC) operates primarily as:
When a long AC transmission line is operated at surge impedance loading (SIL), which condition is typically achieved?
Circuit breakers are rated by:
Economic dispatch in power systems aims to:
A delta-wye transformer connection is often used to:
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