EIT Electrical, Thermodynamics & Fluid Systems 4

Question 1

A pump adds 15 kW of power to water flowing at 0.05 m³/s. Assuming no losses, the pressure rise across the pump is approximately:

Accepted Answer

300 kPa

Answer

ΔP = W_pump / Q = 15000 / 0.05 = 300,000 Pa = 300 kPa.

Question 2

The Clausius inequality states that for any cyclic process:

Accepted Answer

∮ δQ/T ≤ 0

Answer

The Clausius inequality ∮ δQ/T ≤ 0 holds for all real cycles, with equality only for reversible cycles.

Question 3

Which type of diode is specifically designed to operate in reverse breakdown for voltage regulation?

Accepted Answer

Zener diode

Answer

Zener diodes maintain a nearly constant reverse voltage (the Zener voltage) when operated in controlled reverse breakdown.

Question 4

Water flows through a horizontal pipe that narrows from a 10 cm diameter to a 5 cm diameter. If the velocity in the larger section is 1 m/s, the velocity in the smaller section is:

Accepted Answer

4 m/s

Answer

By continuity, A₁V₁ = A₂V₂ → V₂ = V₁(D₁/D₂)² = 1×(10/5)² = 4 m/s.

Question 5

During a constant-volume (isochoric) heating process of an ideal gas, which of the following is true?

Accepted Answer

All heat added goes to increasing internal energy

Answer

At constant volume W = 0, so by the first law Q = ΔU; all heat increases internal energy.

(EIT) Engineer In Training Certification Practice Test

(EIT) Engineer In Training Certification Practice Test

EIT Electrical, Thermodynamics & Fluid Systems 4