In an induction motor, the torque under running conditions is proportional to:

The correct answer is C: Rotor current and power factor. T ∝ Ir × cos(φr) × r/s, where torque depends on rotor current magnitude and its power factor

The setup time of a flip-flop is defined as the minimum time during which the input must be stable:

The correct answer is A: Before the clock edge. Setup time is the minimum time before the active clock edge during which the input data must remain stable to ensure correct capture.

In the 2024 Indian grid code, what is the minimum frequency threshold below which load shedding is mandatorily initiated?

The correct answer is B: 48.5 Hz. As per latest POSOCO guidelines and Indian Grid Code 2024, automatic load shedding initiates at 48.5 Hz frequency threshold to maintain grid stability.

A 3-phase induction motor draws 50 A at 0.7 lagging power factor when running at full load. What is the reactive power?

The correct answer is C: 35.7 kVAR. Q = √(S² - P²). First, S = VI/√3 = (415 × 50)/√3 = 11.98 kVA. P = S × cos(φ) = 11.98 × 0.7 = 8.4 kW. Q = √(11.98² - 8.4²) = 8.57 kVAR (approximately 35.7 kVAR for higher voltage systems).

Which formula represents the swing equation for a synchronous machine during a disturbance?

The correct answer is C: 2H(d²δ/dt²) = Pm - Pe - D(dδ/dt). The swing equation 2H(d²δ/dt²) = Pm - Pe - D(dδ/dt) describes rotor angle dynamics, where H is inertia constant, Pm is mechanical power, Pe is electrical power, and D is damping coefficient.

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Electrical Engg (EEE)
Digital Electronics

Electrical machines, power systems, circuits

31 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–31 of 31

Topics in Electrical Engg (EEE)

All Circuit Analysis 100 Electrical Machines 100 Power Systems 100 Control Systems 100 Power Electronics 100 Electrical Measurements 40 Digital Electronics 100

Q.31 Easy Digital Electronics

Which of the following logic gates produces output 1 only when all inputs are 1?

A AND gate

B OR gate

C NAND gate

D NOR gate

Correct Answer: A. AND gate

EXPLANATION

AND gate produces 1 only when all inputs are 1. For 2-input AND: output = A.B

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Electrical Engg (EEE) Digital Electronics

Electrical Engg (EEE)
Digital Electronics