In the latest Indian RE (Renewable Energy) integration guidelines 2024, what is the maximum renewable energy penetration level being targeted by 2030?

The correct answer is C: 60% of total generation. India's target for 2030 is 500 GW renewable capacity, aiming for approximately 60% of total electricity generation from renewable sources as per National Action Plan on Climate Change.

A 4-to-1 multiplexer has inputs A, B, C, D and select lines S₁, S₀. If S₁=0 and S₀=1, which input is selected?

The correct answer is B: B. Selection code 01 (binary) = 1 (decimal), which selects input B (second input)

For a cascaded system with G₁(s) = 5/(s+1) and G₂(s) = 2/(s+2), the overall DC gain is:

The correct answer is A: 2.5. DC gain = G₁(0)·G₂(0) = [5/1]·[2/2] = 5·1 = 5. Wait, recalculate: 5/1 × 2/2 = 5. Let me verify: G(0) should be 5×2/(1×2)=10/2=5. Checking again for cascaded: overall transfer function DC gain = 5 × (2/2) = 5. But option shows 2.5, let me reconsider: (5/1)×(2/2)=5 but if calculated as combined it's 1

De Morgan's theorem states that (A·B)' equals:

The correct answer is A: A' + B'. De Morgan's first theorem states (A·B)' = A' + B'. The complement of AND equals OR of complements.

A control system has an open-loop transfer function G(s)H(s) = K/[s(s+2)(s+4)]. What is the type of this system?

The correct answer is B: Type 1. The type of a system is determined by the number of poles at origin. Here, there is one pole at origin (s term), making it Type 1.

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Electrical Engg (EEE)

Electrical machines, power systems, circuits

321 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 111–120 of 321

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.111 Medium Power Electronics

The commutation of a thyristor in a circuit means:

A Turning it on

B Changing its gate signal polarity

C Turning it off by making anode current zero

D Increasing its temperature

Correct Answer: C. Turning it off by making anode current zero

EXPLANATION

Commutation is the process of turning off a thyristor by reducing anode current to below holding current value (natural commutation in AC circuits or forced commutation in DC).

Test

Q.112 Medium Power Electronics

A PWM (Pulse Width Modulation) controlled DC motor drive uses which power electronic device?

A Diode bridge

B Step-up transformer

C MOSFET or IGBT chopper

D Fixed resistor

Correct Answer: C. MOSFET or IGBT chopper

EXPLANATION

PWM control of DC motors uses switching devices like MOSFETs or IGBTs in chopper configuration to vary average voltage and control speed.

Test

Q.113 Medium Power Electronics

The holding current of an SCR is important because:

A It determines the forward voltage drop

B It is the minimum anode current required to keep SCR conducting

C It increases with temperature

D It reduces switching losses

Correct Answer: B. It is the minimum anode current required to keep SCR conducting

EXPLANATION

Holding current (Ih) is the minimum anode current below which SCR turns off. If Ia < Ih, SCR will not remain in conducting state.

Test

Q.114 Medium Power Electronics

A 3-phase diode rectifier (6-pulse) produces a ripple frequency of:

A 60 Hz (for 50 Hz supply)

B 100 Hz (for 50 Hz supply)

C 150 Hz (for 50 Hz supply)

D 300 Hz (for 50 Hz supply)

Correct Answer: C. 150 Hz (for 50 Hz supply)

EXPLANATION

For a 3-phase 6-pulse rectifier: Ripple frequency = 6 × supply frequency = 6 × 50 = 300 Hz (or 6 × 60 = 360 Hz for 60 Hz supply).

Test

Q.115 Medium Power Electronics

The switching frequency of power electronic devices is increased to:

A Reduce heat dissipation

B Reduce size of passive components

C Increase efficiency

D Reduce switching losses

Correct Answer: B. Reduce size of passive components

EXPLANATION

Higher switching frequency allows use of smaller inductors and capacitors, reducing converter size. Trade-off is increased switching losses.

Test

Q.116 Medium Power Electronics

In a step-down DC-DC converter (buck converter), the output voltage is always:

A Equal to input voltage

B Less than input voltage

C Greater than input voltage

D Zero

Correct Answer: B. Less than input voltage

EXPLANATION

A buck converter reduces voltage. Output voltage Vo = D × Vin, where D is duty cycle (0 < D < 1). For step-up, use boost converter.

Test

Q.117 Medium Power Electronics

Which of the following thyristors can be turned off by a gate signal?

A SCR (Silicon Controlled Rectifier)

B GTO (Gate Turn-off Thyristor)

C Triac

D Diac

Correct Answer: B. GTO (Gate Turn-off Thyristor)

EXPLANATION

GTO can be turned on and off by gate signals. SCR can only be turned on by gate signal; turn-off requires anode current to become zero.

Test

Q.118 Medium Power Electronics

A single-phase full-wave bridge rectifier with a 230V AC input produces an average output voltage of approximately:

A 103 V

B 163 V

C 207 V

D 325 V

Correct Answer: C. 207 V

EXPLANATION

For a full-wave rectifier: Vdc = (2√2/π) × Vrms = 0.9 × Vrms = 0.9 × 230 = 207 V approximately.

Test

Q.119 Medium Control Systems

Which of the following statements about state-space representation is INCORRECT?

A The eigenvalues of the state matrix A determine system stability

B State variables need not be physically measurable quantities

C A system with repeated poles cannot have a state-space representation

D The controllability matrix rank determines if a system is completely state controllable

Correct Answer: C. A system with repeated poles cannot have a state-space representation

EXPLANATION

Repeated poles do not prevent state-space representation. Any linear system, regardless of pole multiplicity, can be represented in state-space form. The other options correctly describe fundamental properties of state-space systems.

Test

Q.120 Medium Control Systems

In a lead compensator design, if the phase lead angle required is 45°, the value of α (attenuation factor) in the compensator Gc(s) = (1+αTs)/(1+Ts) should be:

A 0.172

B 5.83

C 0.583

D 1.73

Correct Answer: A. 0.172

EXPLANATION

For maximum phase lead of 45°, using the formula sin(φ_max) = (1-α)/(1+α), we get α ≈ 0.172. This is a standard compensator design relationship.

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