EIT Electrical, Thermodynamics & Fluid Systems 5

Question 1

In an op-amp inverting amplifier with R_f = 100 kΩ and R_in = 10 kΩ, the voltage gain is:

Accepted Answer

−10

Answer

Inverting amplifier gain A_v = −R_f / R_in = −100/10 = −10.

Question 2

The major head loss in a pipe system is primarily due to:

Accepted Answer

Pipe wall friction over the pipe length

Answer

Major (Darcy-Weisbach) losses arise from friction along the straight length of the pipe; minor losses come from fittings.

Question 3

An isentropic process is one that is both:

Accepted Answer

Reversible and adiabatic

Answer

An isentropic (constant entropy) process requires both adiabatic (no heat transfer) and reversible conditions.

Question 4

A magnetic flux of 0.5 Wb through a 200-turn coil changes to zero in 0.1 s. The average induced EMF is:

Accepted Answer

1000 V

Answer

EMF = −N ΔΦ/Δt = −200 × (0 − 0.5)/0.1 = 1000 V (magnitude).

Question 5

The specific speed of a pump is used to:

Accepted Answer

Classify pump type and predict performance at varying scales

Answer

Specific speed N_s = N√Q / H^(3/4) classifies pumps (centrifugal, mixed, axial) and guides selection and scaling.

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