Analog and Digital Electronics - Online Test
Q1. 
The approximate transfer characteristic for the circuit shown below with an ideal operational amplifier and diode will be
Answer : Option A
Explaination / Solution:
No Explaination.
Q2. Which of the following is an invalid state in an 8-4-2-1. Binary Coded Decimal counter
Answer : Option D
Explaination / Solution:
In binary coded decimal (BCD) counter the valid states are from 0 to 9 only in binary system 0000 to 1001 only. So, 1100 in decimal it is 12 which is invalid state in BCD counter.
Q3. Given that the op-amp is ideal, the output voltage V0 is
Answer : Option B
Explaination / Solution:
No Explaination.
Q4. 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.
Q5. The nature of feedback in the op-amp circuit shown is
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. The SOP (sum of products) form of a Boolean function is Σ(0,1,3,7,11), where inputs are A,B,C,D (A is MSB, and D is LSB). The equivalent minimized expression of the function is
Answer : Option A
Explaination / Solution:
Q7. The following circuit has R = 10kΩ, C = 10μF . The input voltage is a sinusoid at 50Hz with an
rms value of 10V. Under ideal conditions, the current is from the source is
Answer : Option D
Explaination / Solution:
No Explaination.
Q8. A JK flip flop can be implemented by T flip-flops. Identify the correct implementation.
Answer : Option B
Explaination / Solution:
Q9.
In an 8085 microprocessor, the following program is executed
Address location – Instruction
2000H XRA A
2001H MVI B,04H
2003H MVI A, 03H
2005H RAR
2006H DCR B
2007H JNZ 2005
200AH HLT
At the end of program, register A contains
Answer : Option A
Explaination / Solution:
Q10. In a transconductance amplifier, it is desirable to have
Answer : Option A
Explaination / Solution:
In the transconductance amplifier it is desirable to have large input resistance and large output resistance.
