Q. The magnetic circuit shown below has uniform cross-sectional area and air gap of 0.2 cm. The mean path length of the core is 40 cm. Assume that leakage and fringing fluxes are negligible. When the core relative permeability is assumed to be infinite, the magnetic flux density computed in the air gap is 1 […]
Q. The voltage across and the current through a load are expressed as follows The average power in watts (round off to one decimal place) consumed by the load is Solution:
The voltage across and the current through a load are expressed as follows Read More »
Q. A 0.1 µF capacitor charged to 100 V is discharged through a 1 kΩ resistor. The time in ms (round off to two decimal places) required for the voltage across the capacitor to drop to 1 V is _______ Solution:
Q. The probability of a resistor being defective is 0.02. There are 50 such resistors in a circuit. The probability of two or more defective resistors in the circuit (round off to two decimal places) is . Solution: Probability of a resistor being defective (P) = 0.02 Number of resistors (n) = 50 Mean (λ)
Q. If 𝐀 = 2𝑥𝐢 + 3𝑦𝐣 + 4𝑧𝐤 and 𝑢 = 𝑥2 + 𝑦2 + 𝑧2, then div(𝑢𝐀) at (1, 1, 1) is Ans: 45 Solution:
If 𝐀 = 2𝑥𝐢 + 3𝑦𝐣 + 4𝑧𝐤 and 𝑢 = 𝑥2 + 𝑦2 + 𝑧2, then div(𝑢𝐀) at (1, 1, 1) is Read More »
Q. The line currents of a three-phase four wire system are square waves with amplitude of 100 A. These three currents are phase shifted by 120° with respect to each other. The rms value of neutral current is A. 0 A B. 100 A C. 3 A D. 1 A Ans: 100 A Solution:
Q. A DC-DC buck converter operates in continuous conduction mode. It has 48 V input voltage, and it feeds a resistive load of 24 Ω. The switching frequency of the converter is 250 Hz. If switch-on duration is 1 ms, the load power is (A) 6 W (B) 12 W (C) 24 W (D) 48
Q. In the circuit shown below, X and Y are digital inputs, and Z is a digital output. The equivalent circuit is a (A) NAND gate (B) NOR gate (C) XOR gate (D) XNOR gate Ans: XOR gate Solution: The Boolean expression for the output of the digital circuit is shown below. The above expression
Q. The output expression for the Karnaugh map shown below is Ans: Option A Solution:
The output expression for the Karnaugh map shown below is Read More »
Q. In the circuit below, the operational amplifier is ideal. If V1 = 10 mV and V2 = 50 mV, the output voltage (Vout) is Solution:
