A synchronous BCD counter counts from 0000 to 1001, then resets to 0000. This requires modification of a standard 4-bit counter using:

The correct answer is B: AND gates to detect 1010 and reset. BCD counters use AND gates to detect when the count reaches 1010 (10 in decimal), triggering a reset to 0000 to maintain BCD counting.

What is the typical slip value for a squirrel-cage induction motor operating at full load?

The correct answer is B: 3-5%. Full load slip for squirrel-cage motors typically ranges from 3-5% for good efficiency

Which of the following has the lowest on-state voltage drop among power semiconductor devices?

The correct answer is B: MOSFET. MOSFETs have the lowest on-state voltage drop (few hundred millivolts) at moderate currents. IGBTs: ~1-2V, SCRs: ~1-2V, Diodes: ~0.7-1V depending on rating.

The swing equation of a synchronous machine is given by: 2H(d²δ/dt²) = Pm - Pe - D(dδ/dt). What does H represent?

The correct answer is A: Normalized inertia constant in seconds. H is the inertia constant (M/2×SB) representing the kinetic energy relative to the system base power.

A 8-pole, 3-phase induction motor is required to run at approximately 720 RPM at 50 Hz. The approximate slip required is:

The correct answer is A: 0.04 or 4%. Ns = 120f/P = (120 × 50)/8 = 750 RPM. For Nr = 720 RPM, s = (750 - 720)/750 = 30/750 = 0.04 or 4%.

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Electrical Engg (EEE)
Electrical Measurements

Electrical machines, power systems, circuits

14 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 11–14 of 14

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.11 Easy Electrical Measurements

The class of accuracy for a class 1.5 instrument means:

A Accuracy of ±1.5% of true value

B Accuracy of ±1.5% of measured value

C Accuracy of ±1.5% of full scale deflection

D Accuracy of ±1.5 V

Correct Answer: C. Accuracy of ±1.5% of full scale deflection

EXPLANATION

The accuracy class (e.g., 1.5, 2.0) indicates the maximum percentage error with respect to full scale deflection, as per IEC standards.

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Q.12 Easy Electrical Measurements

The error in an ammeter connected in series with a circuit is primarily due to:

A Its infinite internal resistance

B Its non-zero internal resistance

C Its capacity

D Temperature variations

Correct Answer: B. Its non-zero internal resistance

EXPLANATION

An ideal ammeter should have zero internal resistance. Non-zero internal resistance causes voltage drop and measurement error.

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Q.13 Easy Electrical Measurements

The accuracy of an electrical measuring instrument is expressed as a percentage of:

A True value

B Measured value

C Full scale deflection

D Average value

Correct Answer: C. Full scale deflection

EXPLANATION

In electrical measurements, accuracy is typically expressed as a percentage of full scale deflection (FSD) or full scale reading (FSR) for analog instruments.

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Q.14 Easy Electrical Measurements

Which of the following is the SI unit of electric current?

A Ampere

B Coulomb

C Volt

D Watt

Correct Answer: A. Ampere

EXPLANATION

Ampere (A) is the SI base unit of electric current. It is defined as the flow of one coulomb of charge per second.

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Electrical Engg (EEE) Electrical Measurements

Electrical Engg (EEE)
Electrical Measurements