In a multi-machine power system stability study, which parameter is used to measure relative rotor angle instability between two generators?

The correct answer is B: Rotor angle difference. The stability of a multi-machine system depends on relative rotor angles between machines. Loss of synchronism occurs when relative rotor angle exceeds critical limits.

In MOSFET, the gate-source voltage at which current starts to flow is called:

The correct answer is B: Threshold voltage. Threshold voltage (Vth) is the gate-source voltage required to create an inversion layer and allow current flow in MOSFET.

For a system with Gc(s)G(s)H(s) = 100/[s(s+5)], the phase at ω = 5 rad/s is approximately:

The correct answer is D: -225°. At ω=5: Phase = -90° (from 1/s) - arctan(5/1) - arctan(5/5) = -90° - 78.7° - 45° ≈ -213.7° ≈ -225°

In state-space representation, if eigenvalues of A matrix are at s = -1, -2, -3, the system is:

The correct answer is B: Stable but may be uncontrollable. Stability depends only on eigenvalue locations (all in LHP = stable). Controllability requires rank[B AB A²B] = n, which eigenvalues alone don't determine

For a system with open-loop transfer function G(s)H(s) = K/[s(s+1)(s+2)], the number of asymptotes in root locus is:

The correct answer is B: 2. Number of asymptotes = n - m = 3 - 1 = 2, where n=3 (poles) and m=1 (zeros).

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Electrical Engg (EEE)

Electrical machines, power systems, circuits

196 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–40 of 196

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

Test

Q.32 Easy Electrical Measurements

In a Wheatstone bridge for resistance measurement, if R₁ = 100 Ω, R₂ = 50 Ω, R₃ = 200 Ω, what should be R₄ for balance?

A 50 Ω

B 100 Ω

C 150 Ω

D 200 Ω

Correct Answer: B. 100 Ω

EXPLANATION

At balance: R₁/R₂ = R₃/R₄; R₄ = (R₂ × R₃)/R₁ = (50 × 200)/100 = 100 Ω.

Test

Q.33 Easy Electrical Measurements

A pressure transducer has sensitivity of 0.5 V/bar. If input pressure varies from 0-10 bar, what is the output voltage range?

A 0-2.5 V

B 0-5 V

C 0-10 V

D 0-50 V

Correct Answer: B. 0-5 V

EXPLANATION

Output voltage = Sensitivity × Pressure = 0.5 × 10 = 5 V for maximum pressure of 10 bar.

Test

Q.34 Easy Electrical Measurements

Which bridge circuit is specifically designed to measure inductance with small resistance?

A Maxwell bridge

B Hay bridge

C Owen bridge

D Schering bridge

Correct Answer: A. Maxwell bridge

EXPLANATION

Maxwell bridge is used for measuring inductance (especially with small resistance) in industrial and laboratory applications.

Test

Q.35 Easy Electrical Measurements

What is the primary advantage of a digital multimeter over an analog multimeter in industrial measurements?

A Lower cost of procurement

B No parallax error and direct digital display of readings

C Better frequency response

D Higher mechanical durability

Correct Answer: B. No parallax error and direct digital display of readings

EXPLANATION

Digital multimeters eliminate parallax error, provide direct digital readings, and are more user-friendly for industrial applications.

Test

Q.36 Easy Electrical Measurements

In a CRO probe with 10:1 attenuation ratio, if the actual voltage is 100 V, what voltage appears across the CRO input terminals?

A 10 V

B 100 V

C 1000 V

D 50 V

Correct Answer: A. 10 V

EXPLANATION

With 10:1 attenuation, the voltage at CRO terminals = Actual voltage/10 = 100/10 = 10 V.

Test

Q.37 Easy Electrical Measurements

A thermocouple generates 50 μV for a temperature difference of 1°C between its junctions. What is its sensitivity?

A 50 μV/°C

B 100 μV/°C

C 25 μV/°C

D 200 μV/°C

Correct Answer: A. 50 μV/°C

EXPLANATION

Sensitivity is the ratio of output to input. Here, sensitivity = 50 μV/1°C = 50 μV/°C.

Test

Q.38 Easy Electrical Measurements

Which of the following is NOT a source of error in analog voltmeters?

A Temperature variations affecting resistance

B Mechanical friction in the pointer mechanism

C Increase in frequency of input signal

D Parallax error during reading

Correct Answer: C. Increase in frequency of input signal

EXPLANATION

Analog voltmeters are primarily DC devices. Frequency changes affect AC measurements but not the instrument's basic construction errors.

Test

Q.39 Easy Electrical Measurements

The sensitivity of a galvanometer is defined as:

A Deflection per unit current

B Current per unit deflection

C Resistance per unit deflection

D Voltage per unit current

Correct Answer: A. Deflection per unit current

EXPLANATION

Sensitivity of a galvanometer is the deflection (in mm or degrees) produced per unit current (usually per microampere or milliampere).

Test

Q.40 Easy Electrical Measurements

In a CRO (Cathode Ray Oscilloscope), the Y-deflection sensitivity is expressed in:

A V/division

B A/division

C Ω/division

D Hz/division

Correct Answer: A. V/division

EXPLANATION

Y-deflection sensitivity (or gain) in CRO is expressed in volts per division, indicating how many volts are represented by each vertical division.

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