Electronic Science - Online Test
Q1. 
For the circuit shown in the following figure, transistor M1 and M2 are identical NMOS transistors. Assume the M2 is in saturation and the output is unloaded.
The current Ix is related to Ibias as
Answer : Option B
Explaination / Solution:
Q2. 
With 10 V dc connected at port A in the linear nonreciprocal two-port network shown below, the following were observed:
(i) 1Ω connected at port B draws a current of 3 A
(ii) 2.5Ω W connected at port B draws a current of 2 A
With 10 V dc connected at port A, the current drawn by 7 Ω connected at port B is
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. The load shown in the figure is supplied by a 400 V (line to line) 3-phase source (RYB
sequence). The load is balanced and inductive, drawing 3464 VA. When the switch S is in
position N, the three watt-meters W1, W2 and W3 read 577.35 W each. If the switch is moved to
position Y, the readings of the watt-meters in watts will be
Answer : Option D
Explaination / Solution:
Q4. The figure shows an unbalanced Wheatstone bridge. To balance the bridge:
Answer : Option B
Explaination / Solution:
To balance bridge
So X = 90
Q5.
if =magnetic intensity, =susceptibility, magnetic moment per unit volume equals
Answer : Option A
Explaination / Solution:
No Explaination.
Q6. Diffusion in a p-n junction is due to
Answer : Option A
Explaination / Solution:
- In n-type semiconductor, the concentration of electrons is more compared to the concentration of holes. Similarly, in p-type semiconductor, the concentration of holes is more compared to the concentration of electrons
- The first process that occurs in the p-n semiconductor is diffusion
- In the formation of the p-n junction, due to the concentration gradient across the p and the n sides, the electrons diffuse from n region to p region and the holes diffuse from p region to n region.
Q7. Assuming the diodes to be ideal in the figure, for the output to be clipped, the input voltage vi must be outside the range
Answer : Option B
Explaination / Solution:
Q8. A binary operation ⊕ on a set of integers is defined as x ⊕ y = x2 + y2. Which one of the
following statements is TRUE about ⊕?
Answer : Option A
Explaination / Solution:
x ⊕ y = x2 + y2 = y2 + x2 = y ⊕ x
∴ commutative
Not associative, since, for example
(1 ⊕ 2) ⊕ 3 ≠ 1 ⊕ (2 ⊕ 3)
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.
