WorksheetsCircuit Theory (ECE) test-1
Total questions: 20
Worksheet time: 20mins
The total resistance in a parallel combination of resistors R1 and R2 is given by:
R total =R1+ R2
R total = R1+R2R1R2
R total =R1 R2
R total = R1+R21
The total power in an AC circuit with a resistor is:
Active power
Reactive power
Apparent power
None of the above
For a series R-L circuit, the phase angle between the current and the voltage is:
0 degrees
45 degrees
90 degrees
Depends on R and L values
Kirchhoff’s Voltage Law (KVL) is based on the principle of:
Conservation of charge
Conservation of energy
Conservation of current
Conservation of power
For an R-C series circuit, the phase angle between the current and the voltage is:
0 degrees
45 degrees
90 degrees
Between 0 and 90 degrees
The unit of capacitance is:
Farad
Henry
Ohm
Tesla
What is the unit of bandwidth?
Hertz
Seconds
Decibels
Ohms
If a signal occupies a frequency range from 1 MHz to 5 MHz, what is its bandwidth?
4 MHz
5 MHz
1 MHz
6 MHz
Which factor does NOT affect the bandwidth of a transmission medium?
Material of the medium
Length of the medium
Modulation technique
Gravitational force
What is the typical bandwidth of a voice channel in telephony?
300 Hz to 3.4 kHz
20 Hz to 20 kHz
1 kHz to 10 kHz
0 Hz to 300 Hz
For a system with a maximum data rate of 5 Mbps using the Nyquist formula, what is the minimum bandwidth required for 2 levels of signaling?
1.25 MHz
2.5 MHz
5 MHz
10 MHz
In a frequency modulation (FM) system, if the modulation index increases, what happens to the bandwidth?
Decreases
Increases
Remains constant
Becomes zero
Which type of filter is used to limit the bandwidth of a signal?
High-pass filter
Band-pass filter
Low-pass filter
All of the above
What is the relationship between bandwidth and rise time of a signal?
Bandwidth = 1 / (Rise Time)
Bandwidth = 2 / (Rise Time)
Bandwidth = 0.35 / (Rise Time)
Bandwidth = 0.5 / (Rise Time)
What is the characteristic impedance of a transmission line?
Resistance of the line
Capacitance of the line
Ratio of voltage to current in a traveling wave
Frequency of the line
The velocity of propagation in a transmission line depends on:
Capacitance and resistance
Inductance and capacitance
Resistance and conductance
Frequency and inductance
What is the primary purpose of a stub in a transmission line?
To reduce resistance
To increase bandwidth
To match impedance
To enhance signal strength
What is the standing wave ratio (SWR) when a transmission line is perfectly matched?
0
1
Infinity
2
What happens when a transmission line is terminated with an impedance greater than its characteristic impedance?
Reflected wave is in phase with the incident wave
Reflected wave is out of phase with the incident wave
No reflection occurs
Line becomes a short circuit
The loss in a transmission line is usually expressed in:
Decibels (dB)
Hertz (Hz)
Watts (W)
Joules (J)
