Electrical Engineering - Online Test

Q1. A voltage commutated chopper circuit, operated at 500Hz, is shown below.

If the maximum value of load current is 10A, then the maximum current through the main (M) and auxiliary (A) thyristors will be
Answer : Option A
Explaination / Solution:



Q2. The matrix  is decomposed into a product of a lower triangular matrix [L] and an upper triangular matrix [U]. The properly decomposed [L] and [U] matrices respectively are
Answer : Option D
Explaination / Solution:

[A] = [L][U] Option D is correct

Q3. A two – bit counter circuit is shown below

It the state QAQof the counter at the clock time tn is ‘10’ then the state QAQB of the counter at tn + 3 (after three clock cycles ) will be
Answer : Option C
Explaination / Solution:



Q4.
The Boolean expression for the output f of the multiplexer shown below is 

Answer : Option A
Explaination / Solution:
No Explaination.


Q5. The bridge method commonly used for finding mutual inductance is
Answer : Option A
Explaination / Solution:
No Explaination.


Q6. In the circuit shown below what is the output voltage out (Vout) in Volts if a silicon transistor Q and an ideal op-amp are used?
 
Answer : Option B
Explaination / Solution:
No Explaination.


Q7. A dielectric slab with 500mm x 500mm cross-section is 0.4m long. The slab is subjected to a uniform electric field of . The relative permittivity of the dielectric material is equal to 2. The value of constant ε0 is 8.85 × 10-12 F/m. The energy stored in the dielectric in Joules is
Answer : Option B
Explaination / Solution:
No Explaination.


Q8. For the BJT circuit shown, assume that the β of the transistor is very large and VBE = . V. The mode of operation of the BJT is

Answer : Option B
Explaination / Solution:



Q9.
In the following scheme, if the spectrum M(f) of m(t) is as shown, then the spectrum Y(f) of y(t) will be

Answer : Option B
Explaination / Solution:





Q10. Let the Laplace transform of a function F(t) which exists for t > 0 be F1(s) and the Laplace transform of its delayed version  be the complex conjugate of F1(s) with the Laplace variable set as s=σ + jw. If G(s) = , then the inverse Laplace transform of G(s) is
Answer : Option B
Explaination / Solution: