level 3

Why is the core of a transformer laminated?

• To reduce the weight

• To increase efficiency

• To reduce eddy current losses

• To increase hysteresis loss

What does it mean if a matrix is orthogonal?

• Its determinant is always 1  

• Its transpose is equal to its inverse

• It has only real eigenvalues  

• It has only zero eigenvalues

If a conductor is placed in a time-varying magnetic field, it induces an

• Electrostatic field

• Induced emf

• Magnetic moment

•  Capacitance

What principle states that no two electrons in an atom can have the same set of four quantum numbers?

• Heisenberg Uncertainty Principle  

• Pauli Exclusion Principle

•  Aufbau Principle

•  Hund’s Rule  

Why does printf("%d", sizeof(NULL)); output different values on different systems?

• Because NULL is not defined

•  Because NULL has different sizes on different architectures

• Because sizeof doesn’t work on NULL

• Because NULL is always 4 bytes

Why does a MOSFET have high input impedance compared to a BJT?

• Because of gate insulation

• Because of higher mobility

• Because it operates in saturation

• Because it has a higher voltage

Which law governs the operation of an electric motor?

• Lenz’s Law

• Faraday’s Law

• Coulomb’s Law

• Kirchhoff’s Voltage Law

If tanA=1, then A may lie in

•  1st or 2nd quadrant

• 1st or 3rd quadrant

• 2nd or 4th quadrant

• 3rd or 4th quadrant

Why do we use a Schottky diode in high-frequency applications?

• Because of low forward voltage drop

• Because of higher reverse resistance

• Because of better thermal stability

•  Because of lower capacitance

If you draw one card, what is the probability that it is either a red Ace or a black Queen?

•  1/13

• 2/13

• 1/26

• 3/26