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

The correct answer is A: Maxwell bridge. Maxwell bridge is used for measuring inductance (especially with small resistance) in industrial and laboratory applications.

For an industrial induction motor variable frequency drive (VFD) using vector control, what is the typical output frequency range in 2024-25 applications?

The correct answer is C: 0.1-500Hz. Modern VFDs support 0.1Hz to 500Hz+ output, enabling ultra-low speed precision applications and extended-speed motor operation.

A shaded pole induction motor uses ________ for starting torque generation.

The correct answer is B: Shaded pole or copper ring. Shaded pole motors use a copper ring or shaded pole around part of the pole face to create a phase shift in the magnetic field, producing starting torque without additional components.

In a half-bridge inverter, what is the minimum dead time required to prevent shoot-through if the switching frequency is 20kHz?

The correct answer is C: 2.0μs. Dead time should be 2-3 times the device switching time (~0.5-1μs for modern IGBTs), typically 1-3μs to ensure safe commutation.

For a passive linear network, the input impedance looking into terminals is Z(s). If a unit impulse is applied as input, the impulse response h(t) is the:

The correct answer is C: Inverse Laplace transform of Y(s) where Y(s) = 1/Z(s). Impulse response h(t) = L⁻¹[Y(s)] where Y(s) is admittance. For impedance Z(s), admittance Y(s) = 1/Z(s).

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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 21–30 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.21 Easy Digital Electronics

Which of the following is used to convert analog signals to digital for processing?

A Decoder

B Multiplexer

C Analog-to-Digital Converter (ADC)

D Demultiplexer

Correct Answer: C. Analog-to-Digital Converter (ADC)

EXPLANATION

ADCs are specifically designed to convert continuous analog signals into discrete digital representations for digital processing systems.

Test

Q.22 Easy Digital Electronics

In a multiplexer, the number of select lines required to select from 16 data inputs is:

A 3 lines

B 4 lines

C 5 lines

D 8 lines

Correct Answer: B. 4 lines

EXPLANATION

For 2^n data inputs, n select lines are needed. 2^4 = 16, so 4 select lines are required for a 16-to-1 multiplexer.

Test

Q.23 Easy Digital Electronics

In a Karnaugh map, what does a larger group of adjacent 1's represent?

A More complex Boolean expression

B Simpler Boolean expression with fewer literals

C Higher switching speed

D Lower power consumption

Correct Answer: B. Simpler Boolean expression with fewer literals

EXPLANATION

Larger groups in K-maps represent simplification with fewer variables in the resulting Boolean expression, reducing circuit complexity.

Test

Q.24 Easy Digital Electronics

The setup time of a flip-flop is defined as:

A Time for output to stabilize after clock edge

B Minimum time data must be stable before clock edge

C Total propagation delay

D Time between consecutive clock pulses

Correct Answer: B. Minimum time data must be stable before clock edge

EXPLANATION

Setup time is the minimum duration the input data must remain stable and valid before the active clock edge for reliable operation.

Test

Q.25 Easy Digital Electronics

In the 2024-25 examination pattern, which logic family provides the lowest power consumption?

A TTL

B ECL

C CMOS

D PMOS

Correct Answer: C. CMOS

EXPLANATION

CMOS (Complementary Metal-Oxide-Semiconductor) logic has the lowest power consumption, making it the preferred choice for modern digital systems and portable devices.

Test

Q.26 Easy Digital Electronics

Which of the following is a characteristic of combinational circuits?

A Output depends on present and past inputs

B Output depends only on present input values

C They require memory elements

D They have feedback paths

Correct Answer: B. Output depends only on present input values

EXPLANATION

Combinational circuits have outputs that depend solely on the current input values, with no memory or feedback elements involved.

Test

Q.27 Easy Digital Electronics

What is the decimal equivalent of binary number 10110₂?

A 20

B 22

C 24

D 26

Correct Answer: B. 22

EXPLANATION

10110₂ = 1×16 + 0×8 + 1×4 + 1×2 + 0×1 = 16 + 4 + 2 = 22₁₀

Test

Q.28 Easy Digital Electronics

Which number system is most commonly used in digital electronics for representing data?

A Decimal

B Octal

C Binary

D Hexadecimal

Correct Answer: C. Binary

EXPLANATION

Binary (base-2) is fundamental to digital electronics as it uses 0 and 1 matching ON/OFF states

Test

Q.29 Easy Digital Electronics

How many flip-flops are required to design a MOD-16 counter?

A 3 flip-flops

B 4 flip-flops

C 5 flip-flops

D 2 flip-flops

Correct Answer: B. 4 flip-flops

EXPLANATION

MOD-n counter requires log₂(n) flip-flops. For MOD-16: log₂(16) = 4 flip-flops

Test

Q.30 Easy Digital Electronics

What is the Boolean expression for XOR gate with inputs A and B?

A A.B + A'.B'

B A.B' + A'.B

C A + B

D A.B

Correct Answer: B. A.B' + A'.B

EXPLANATION

XOR produces 1 when inputs are different: A⊕B = A.B' + A'.B

Test

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Electrical Engg (EEE) Digital Electronics

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Digital Electronics