Electrical Engineering - Online Test
Q1. A fair coin is tossed till a head appears for the first time. The probability that the number of required tosses is odd, is
Answer : Option C
Explaination / Solution:
Q2. The transfer function of a compensator is given as
The phase of the above lead compensator is maximum at
Answer : Option A
Explaination / Solution:
Q3. The angle δ in the swing equation of a synchronous generator is the
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. For a periodic signal 
the
fundamental frequency in radians/s is
the
fundamental frequency in radians/s is
Answer : Option A
Explaination / Solution:
No Explaination.
Q5. Given that the op-amp is ideal, the output voltage V0 is
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. Consider the set of strings on {0,1} in which, every substring of 3 symbols has at most two
zeros. For example, 001110 and 011001 are in the language, but 100010 is not. All strings of
length less than 3 are also in the language. A partially completed DFA that accepts this
language is shown below.
The missing arcs in the DFA are
Answer : Option D
Explaination / Solution:
The complete DFA is
Q7. 
In the figure shown below, the chopper feeds a resistive load from a battery source. MOSFET Q is switched at 250 kHz, with a duty ratio of 0.4. All elements of the circuit are assumed to be ideal
The average source current in Amps in steady-state is
Answer : Option B
Explaination / Solution:
No Explaination.
Q8. A 10 kHz even-symmetric square wave is passed through a bandpass filter with centre frequency at 30 kHz and 3 dB passband of 6 kHz. The filter output is
Answer : Option C
Explaination / Solution:
10 KHz even symmetric square wave have frequency component present 10KHz, 30KHz, 50KHz, 70KHz
[only odd harmonics due to half wave symmetry]
Since bandpass filter is contered at 30KHz, 30KHz component will pass through
filter output is nearly perfect cosine wave at 10 KHz
Cosine in due to reason that signal in even signal.
Q9. A 3-phase balanced load which has a power factor of 0.707 is connected to balanced supply. The power consumed by the load is 5kW. The power is measured by the two wattmeter method. The readings of the two wattmeters are
Answer : Option A
Explaination / Solution:
satisfiying only for(A)
Q10. A λ/2 dipole is kept horizontally at a height of λ0/2 above a perfectly conducting
infinite ground plane. The radiation pattern in the lane of the dipole (
plane)
looks approximately as
plane)
looks approximately as
Answer : Option B
Explaination / Solution:
