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DFCCIL’21 EE: Daily Practice Quiz. 22-Sep-2021

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EXAM DATES

26 SEPT TO 30 SEPT

DFCCIL’21 EE: Daily Practices Quiz

DFCCIL’21 EE: Daily Practices Quiz 22-Sep-2021

Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 08 min.

Q1. A XOR gate produces an output only when its two inputs are
(a) Same
(b) Low
(c) High
(d) Different

Q2. In a P-pole, f-Hz, 3-phase induction motor, synchronous angular velocity in mechanical and electrical radians per second is respectively?
(a) 4πf/P,2πf/P
(b) 2πf/P,4πf/P
(c) 2πf/P,4πf
(d) 4πf/P,2πf

Q3. A stepper motor has a step angle of 2.5⁰. If the shaft is to make 25 revolutions, the number of steps required will be:
(a) 1800
(b) 3600
(c) 2200
(d) 2800

Q4. Transfer function is defined for:
(a) linear system only
(b) non-linear system only
(c) Linear time-invariant system only
(d) Linear time-dependent systems only

Q5. A second order control system has a transfer function 16/(s^2+4s+16). Find the settling time for 2% tolerance?
(a) 2 sec.
(b) 5 sec.
(c) 10 sec.
(d) 20 sec.

Q6. The line integral of magnetic field intensity around closed path is equal to current enclosed by path.” This Statement is associated with which law?
(a) Coulomb’s law
(b) Gauss’s law
(c) Ampere’s circuital law
(d) Lenz’s law

SOLUTIONS

DFCCIL 2021, DFCCIL ELECTRICAL QUIZ, |_30.1

S3. Ans.(b)
Sol. Number of revolutions=25
Angle rotated(Ө)=25×360⁰
Number of steps=(25×360^0)/2.5^0 =3600.

S4. Ans.(c)
Sol. Transfer function = (Laplace of O\/p)/(Laplace of i\/p)
→ with initial condition zero.
→ applicable for linear TIV system.

S5. Ans.(a)
Sol. For given transfer function, _n=4 rad/s
ξ=damping ratio=0.5.
So, for 2% tolerance, settling time=4/(ξωn )=4/(0.5×4)=4/2=2 sec.

DFCCIL 2021, DFCCIL ELECTRICAL QUIZ, |_40.1

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