Electrical Engineering - Online Test
Q1. A low – pass filter with a cut-off frequency of 30Hz is cascaded with a high-pass filter with a cut-off frequency of 20Hz. The resultant system of filters will function as
Answer : Option D
Explaination / Solution:
Q2. A three-phase current source inverter used for the speed control of an induction
motor is to be realized using MOSFET switches as shown below. Switches S1 to S6 are identical switches.
The proper configuration for realizing switches S1 to S6 is
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. The voltage applied to a circuit is 
volts and the circuit draws
a current of 
amperes. Taking the voltage as the
reference phasor, the phasor representation of the current in amperes is
volts and the circuit draws
a current of amperes. Taking the voltage as the
reference phasor, the phasor representation of the current in amperes is
Answer : Option B
Explaination / Solution:
Q4. A negative sequence relay is commonly used to protect
Answer : Option A
Explaination / Solution:
No Explaination.
Q5. The minterm expansion of f 
Answer : Option A
Explaination / Solution:
No Explaination.
Q6. The circuit shown is a
Answer : Option B
Explaination / Solution:
Q7. The curl of the gradient of the scalar field defined by V = 2x2y + 3y2z + 4z2x is
Answer : Option D
Explaination / Solution:
No Explaination.
Q8. If S(f) is the power spectral density of a real, wide-sense stationary random process, then which of the following is ALWAYS true?
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Group I lists four types of p − n junction diodes. Match each device in Group I with one of the option in Group II to indicate the bias condition of the device in its normal mode of operation.
Group - I Group-II
(P) Zener Diode (1) Forward bias
(Q) Solar cell (2) Reverse bias
(R) LASER diode
(S) Avalanche Photodiode
Answer : Option B
Explaination / Solution:
Zener diode and Avalanche diode works in the reverse bias and laser diode works in forward bias.
In solar cell diode works in forward bias but photo current is in reverse direction. Thus
Zener diode : Reverse Bias
Solar Cell : Forward Bias
Laser Diode : Forward Bias
Avalanche Photo diode : Reverse Bias
Q10. 
The frequency response of a linear system G(jw) is provided in the tubular form below
Answer : Option A
Explaination / Solution:
