Electronics Engineering - Online Test

Q1. The curl of the gradient of the scalar field defined by V = 2x2y + 3y2z + 4z2x is
Answer : Option D
Explaination / Solution:
No Explaination.


Q2. 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.


Q3. 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

Q4.
The frequency response of a linear system G(jw) is provided in the tubular form below

Answer : Option A
Explaination / Solution:



Q5.
The steady state error of a unity feedback linear system for a unit step input is 0.1. The steady state error of the same system, for a pulse input r(t) having a magnitude of 10 and a duration of one second, as shown in the figure is

Answer : Option A
Explaination / Solution:



Q6.
In the circuit given below, the value of R required for the transfer of maximum power to the load having a resistance of 3W is

Answer : Option A
Explaination / Solution:



Q7. In delta modulation, the slope overload distortion can be reduced by
Answer : Option D
Explaination / Solution:
No Explaination.


Q8. A portion of the main program to call a subroutine SUB in an 8085 environment is given below. : : LXI D,DISP LP : CALL SUB : It is desired that control be returned to LP+DISP+3 when the RET instruction is executed in the subroutine. The set of instructions that precede the RET instruction in the subroutine are
Answer : Option C
Explaination / Solution:
No Explaination.


Q9. The transistor used in the circuit shown below has a β of 30 and ICBO is negligible

If the forward voltage drop of diode is 0.7V, then the current through collector will be
Answer : Option D
Explaination / Solution:



Q10.  digit DMM has the error specification as : 0.2% of reading + 10 counts. If a dc voltage of 100V is read on its 200V full scale, the maximum error that can be expected in the reading is 
Answer : Option C
Explaination / Solution:
No Explaination.