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Physics

Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 4: The Electric Transformer and Electric Motor (DC Motor) — Lesson quiz

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  • Questions count: 5
  • Passing grade: 60%
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1.
Why does an electric transformer fail to operate when connected to a 24 V DC accumulator battery?
The accumulator voltage is too high
The DC battery produces a constant magnetic flux with zero time rate of change
Direct current causes immediate short circuiting
Soft iron does not conduct magnetic flux with DC
2.
The hydrostatic pressure exerted by a static homogeneous liquid of density rho at depth h beneath its free surface is expressed by:
P = rho * h / g
P = 1/2 rho * g * h2
P = rho * g / h
P = rho * g * h
3.
A diver descends to a depth of 30 meters in seawater (density = 1030 kg/m3. If atmospheric pressure is 1.013 x 105 Pa and g = 9.8 m/s2, the total absolute pressure experienced by the diver is approximately:
3.03 x 105 Pa
6.06 x 105 Pa
4.04 x 105 Pa (approx. 4.0 atmospheres)
1.01 x 105 Pa
4.
Pascal's principle states that when pressure is applied to an enclosed, incompressible fluid, it is transmitted:
Undiminished to every portion of the fluid and to the walls of the containing vessel
With an exponential decay as distance increases
Only downwards towards the bottom of the vessel
Strictly to compressible gases
5.
In a hydraulic press, the ratio of the cross-sectional area of the large piston to that of the small piston is 50. If a force of 100 N is exerted on the small piston, the maximum force exerted by the large piston is:
5000 N
50,000 N
2500 N
2 N
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