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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