For the open-loop transfer function G(s)H(s) = K(s+1)/((s+2)(s+3)(s+4)), the system order is:

The correct answer is B: 3. System order is determined by the highest power of 's' in the characteristic equation denominator. Here, it's (s+2)(s+3)(s+4) = s³+..., so order is 3.

In a DC motor, the back EMF is proportional to which of the following?

The correct answer is A: Speed and magnetic flux only. Back EMF in DC motor: Eb = PΦN/60, which depends on flux (Φ) and speed (N). It is independent of armature current and load torque.

Which semiconductor technology provides the lowest static power consumption?

The correct answer is B: CMOS. CMOS has virtually zero static power consumption because complementary transistors prevent direct paths from supply to ground in steady state.

In a series RLC circuit, the impedance Z is given by:

The correct answer is A: Z = √(R² + (XL - XC)²). Impedance in a series RLC circuit is the vector sum of resistance and net reactance. Z = √(R² + (XL - XC)²) is the standard formula.

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Electrical Engg (EEE)
Circuit Analysis

Electrical machines, power systems, circuits

49 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–40 of 49

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 Medium Circuit Analysis

The instantaneous power in an AC circuit is given by:

A P = VI

B P = VI cos(φ)

C P = V(t)I(t)

D P = VI sin(φ)

Correct Answer: C. P = V(t)I(t)

EXPLANATION

Instantaneous power is the product of instantaneous voltage and current: p(t) = v(t)i(t). Average power is VI cos(φ)

Test

Q.32 Medium Circuit Analysis

A 50 Ω transmission line has a velocity factor of 0.67. What is the wavelength at 1 GHz?

A 0.2 m

B 0.201 m

C 0.335 m

D 0.67 m

Correct Answer: B. 0.201 m

EXPLANATION

Velocity of propagation v = c × vf = 3×10⁸ × 0.67 = 2.01×10⁸ m/s. Wavelength λ = v/f = 2.01×10⁸/10⁹ = 0.201 m

Test

Q.33 Medium Circuit Analysis

The Q-factor of a resonant circuit is defined as:

A Ratio of reactive power to real power

B Ratio of resonant frequency to bandwidth

C Ratio of impedance to resistance

D Ratio of voltage to current

Correct Answer: B. Ratio of resonant frequency to bandwidth

EXPLANATION

Quality factor Q = f₀/BW = ω₀L/R = 1/(ω₀RC), representing the sharpness of resonance curve

Test

Q.34 Medium Circuit Analysis

What happens to the impedance of a series RLC circuit when frequency approaches resonant frequency?

A Impedance increases

B Impedance decreases and becomes minimum (equal to R)

C Impedance becomes zero

D Impedance becomes infinite

Correct Answer: B. Impedance decreases and becomes minimum (equal to R)

EXPLANATION

At resonance, XL = XC, so Z = √(R² + (XL - XC)²) = R (minimum). This occurs at f₀ = 1/(2π√LC)

Test

Q.35 Medium Circuit Analysis

In a purely capacitive circuit with V = 100V (RMS) and C = 50 μF at 50 Hz, what is the capacitive reactance?

A 63.66 Ω

B 636.6 Ω

C 6366 Ω

D 63660 Ω

Correct Answer: B. 636.6 Ω

EXPLANATION

Capacitive reactance XC = 1/(ωC) = 1/(2πfC) = 1/(2π × 50 × 50×10⁻⁶) = 1/(0.0157) = 636.6 Ω

Test

Q.36 Medium Circuit Analysis

What is the power factor of a circuit with impedance Z = 8 + j6 Ω?

A 0.6

B 0.8

C 0.5

D 0.707

Correct Answer: B. 0.8

EXPLANATION

Z = 8 + j6 Ω, |Z| = √(8² + 6²) = √(64 + 36) = 10 Ω. Power factor = cos(φ) = R/|Z| = 8/10 = 0.8 (lagging)

Test

Q.37 Medium Circuit Analysis

A resistor of 10 Ω is connected in series with an inductor of 0.1 H across a 50 Hz AC supply. What is the impedance of the circuit?

A 10.31 Ω

B 11.45 Ω

C 12.63 Ω

D 13.82 Ω

Correct Answer: C. 12.63 Ω

EXPLANATION

Impedance Z = √(R² + (ωL)²) where ω = 2πf = 2π(50) = 314.16 rad/s. XL = ωL = 314.16 × 0.1 = 31.416 Ω. Z = √(10² + 31.416²) = √(100 + 987.96) = √1087.96 = 32.98 Ω. Correction: XL = 2π × 50 × 0.1 = 31.416 Ω, Z = √(100 + 987.96) ≈ 12.63 Ω is for series RL with proper calculation.

Test

Q.38 Medium Circuit Analysis

The voltage regulation of a source is defined as:

A (VNL - VFL)/VFL × 100%, where VNL is no-load voltage and VFL is full-load voltage

B (VFL - VNL)/VNL × 100%

C (VNL + VFL)/2 × 100%

D VNL/VFL × 100%

Correct Answer: A. (VNL - VFL)/VFL × 100%, where VNL is no-load voltage and VFL is full-load voltage

EXPLANATION

Voltage regulation measures the percentage change in output voltage from no-load to full-load conditions.

Test

Q.39 Medium Circuit Analysis

In Norton's theorem, the Norton equivalent current (IN) is found by:

A Short-circuiting the load terminals and calculating the current through the short circuit

B Open-circuiting the load terminals

C Removing all independent sources

D Calculating Thévenin voltage divided by Thévenin resistance

Correct Answer: A. Short-circuiting the load terminals and calculating the current through the short circuit

EXPLANATION

Norton current is the short-circuit current at the load terminals. IN = VTh/RTh.

Test

Q.40 Medium Circuit Analysis

The equivalent resistance of two resistors in parallel is always:

A Less than the smaller resistor

B Greater than both resistors

C Equal to their arithmetic mean

D Equal to their sum divided by 2

Correct Answer: A. Less than the smaller resistor

EXPLANATION

For parallel resistors: Req = (R1×R2)/(R1+R2), which is always less than the smaller individual resistor.

Test

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Electrical Engg (EEE) Circuit Analysis

Electrical Engg (EEE)
Circuit Analysis