## Thursday, February 14, 2019

### Basic Electrical Engineering (Objective questions)

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[1] Which of the following can vary with ac, but never with dc?
A. Power
B. Voltage
C. Frequency
D. Amplitude

[2] If all other factors are kept constant, the inductance of the air-core coil is not affected by
A. The frequency
B. The number of turns
C. The diameter of the coil
D. The length of the coil

[3] The length of time between a point in one cycle and the same point in the next cycle of an ac wave is the
A. Frequency
B. Magnitude
C. Period
D. Polarity

[4] Capacitance acts to store electrical energy as
A. Current
B. Voltage
C. A magnetic field
D. An electric field

[5] On a spectrum analyzer, a ac signal having only one frequency component looks like
A. A single pip
B. A sine wave
C. A square wave
D. A sawtooth wave

[6] A ferromagnetic core is place in the inductor to
A. Increase the current carrying capacity
B. Increase the inductance
C. Limit the current
D. Reduce the inductance

[7] The period of a ac wave, in seconds is
A. The same as the frequency in hertz
B. Not related to the frequency in any way
C. Equal to 1 divided by the frequency in hertz
D. Equal to the peak amplitude in volts divided by the frequency in hertz

[8] An inductor works by
A. Charging a piece of wire
B. Storing energy as a magnetic field
C. Choking off dc
D. Introducing resistance into a field

[9] As capacitor plate area increases
A. The capacitance increases
B. The capacitance decreases
C. The capacitance does not change
D. The current handling ability decreases

[10] In a small inductance
A. Energy is stored and released slowly
B. The current flow is always large
C. The current flow is always slow
D. Energy is stored and released quickly

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