Electrical Engineering - Online Test
Q1. 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:
Q2. Which one of the following statements is NOT TRUE for a continuous time causal and stable LTI system?
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. The impulse response of a system is h(t) = tu(t). For an input u(t − 1), the output is
Answer : Option C
Explaination / Solution:
No Explaination.
Q4. When the Newton-Raphson method is applied to solve the equation f(x) = x3 + 2x – 1 = 0, the solution at the end of the first iteration with the initial
guess value as x0 = 1.2 is
Answer : Option C
Explaination / Solution:
No Explaination.
Q5. A function y = 5x2 + 10x is defined over an open interval x = (1,2). Atleast at one
point in this interval, dy/dx is exactly
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. The following arrangement consists of an ideal transformer and an attenuator
which attenuates by a factor of 0.8. An ac voltage VWX1 = 100 V is applied across
WX to get an open circuit voltage across YZ. Next, an ac voltage VYZ2 =100V is
applied across YZ to get an open circuit voltage VWX2 across WX. Then, 
are respectively,
are respectively,
Answer : Option C
Explaination / Solution:
No Explaination.
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.
