Electrical Engineering - Online Test
Q1. The unilateral Laplace transform of f (t) is 
. The unilateral Laplace transform of
t f (t)
is
. The unilateral Laplace transform of
t f (t)
is
Answer : Option D
Explaination / Solution:
Q2. A 220 V, 15 kW, 1000 rpm shunt motor with armature resistance of 0.25 Ω has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is
Answer : Option D
Explaination / Solution:
Q3. The maximum value of F(x) = x3 – 9x2 + 24x + 5 in the interval [1, 6] is
Answer : Option C
Explaination / Solution:
Q4. In the 3-phase inverter circuit shown, the load is balanced and the gating scheme is 1800 -conduction mode.
All the switching devices are ideal
The rms value of load phase voltage is
Answer : Option B
Explaination / Solution:
Q5. Consider the following circuit involving three D-type flip-flops used in a certain type of counter configuration.
If at some instance prior to the occurrence of the clock edge, P. Q and R have a
value 0, 1 and 0 respectively, what shall be the value of PQR after the clock
edge?
Answer : Option D
Explaination / Solution:
From the Table Shown in the explanation of question 50, if first state is 010 next
State is 011
Q6. 
The input impedance of the permanent magnet moving coil (PMMC) voltmeter is infinite. Assuming that the diode shown in the figure below is ideal, the reading of the voltmeter in Volts is
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. In the circuit shown below, Q1 has negligible collector-to-emitter saturation
voltage and the diode drops negligible voltage across it under forward bias. If Vcc is +5V, X and Y are digital signals with 0V as logic 0 and Voc as logic 1, then the
Boolean expression for Z is
Answer : Option B
Explaination / Solution:
No Explaination.
Q8. The
field in a rectangular waveguide of inner dimension a × b is given by 
field in a rectangular waveguide of inner dimension a × b is given by Where H0 is a constant, and a and b are the dimensions along the x − axis and
the y − axis respectively. The mode of propagation in the waveguide is
Answer : Option A
Explaination / Solution:
Q9. An RLC circuit with relevant data is given below.
The current Ic in the figure above is
Answer : Option D
Explaination / Solution:
Q10. Which of the following is NOT associated with a p - n junction ?
Answer : Option D
Explaination / Solution:
Channel length modulation is not associated with a p - n junction. It is being associated with MOSFET in which effective channel length decreases, producing the phenomenon called channel length modulation.
