Electrical MCQs
Part-1
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Question: The receiver must generate the
carrier ________ for demodulation
a. in phase
b. out of
phase
c. both
d. none of
these
Ans: a
Question: Full wave rectifier, the output can
be……… (The average (DC) output voltage is higher than for half wave, the output
of the full wave rectifier has much less ripple than that of the half wave
rectifier producing a smoother output waveform.)
a. Single
b. Double
c. Maximum
(efficiency is maximum i.e. 82%, ripple is low and frequency is twice the
applied)
d. Minimum
Ans: c
Question: Non anticipative (physical) system
is
a. stable
b. unstable
c. periodic
d. casual
Ans: d
Question: ____________ System are casual.
a. memory
b. stable
c. memory
less
d. natural
Ans: d
Question: Conjugate property of the signal
x'(t) transform by Laplace transform is
a. x' (s)
b. x' (ts')
c. x' (s')
d. x' (t')
Ans: c
Question: There are _________ ways to modulate
information on to a sequence of pulse modulation
a.2
b.3
c.4
d.5
e.6
Ans: b
Question: Laplace of U(t) unit step function
is
a. 1
b. 1/s
c. 1/t
d. 1/s2
Ans: b
Question: In standard QPSK the carrier phase
can change only----------- in every 2T
a. Twice
b. Once
c. Thrice
d. none of
the above
Ans: b
Question: The minimum value of delta that can
be used for orthogonal design is
a. 1T
b. 1/2T
c. 2T
D. all of
the above.
Ans: b
Question: To transmit binary digits through
base band channel digits are represented as…….
a. wave form
b. digital
pulse
c.
electrical pulse
d. A and C
both
Ans: d
Question: Curl of a vector is
A. Vector
B. Scalar
C. Cartesian
of vector
D. None of
the above
Ans: a
Question: Aero derivate turbine don’t have (it
also has blades, shaft ,combustion chamber or burner , rotors and Nozzles-some
time called throttle valves)
A. Stator
B. Compressor
C. Fuel
intake
D. Fans
Ans: c
Question: Diversity factor is always ____ than
1
A. Less than
B. Greater
than
C. Equal to
D. None of
the above
Ans: b
Question: Oscilloscope measures
A. Current
B. Voltage
C.
Resistance
D. None of
the above
Ans: b
Question: If Integral of f(x) is F(x) then it
is
A. Definite
integral
B.
Indefinite integral
C. Constant
d. None of
these
Ans: b
Question: Modern computers uses
A. BJTs
B. SCR
C. ICs
d. None of
these
Ans: c
Question: What is Load factor?
a) Average
load / max load
b)
Max/Average load
c)
Max.demand/Max.Load
d) None of
these
Ans: a
Question: What is highest transmission voltage
the world?
a) 500 KV
b) 1200kv
c) 66kv
d) 800 KV
Ans: d
Question: Which transformer is used for over
current protection ?
a) Current
Transformer
b) Potential
transformer
c) Voltage
transformer
d) Power
transformer
Ans: a
Question: What is Combination logic circuit?
a) Boolean
circuits,
b)
Sequential Logic Circuit
c) ICs
Circuit
d) Digital
Circuit
Ans: a
Question: Derivative of COS(x)
a) –sin x
b) Sinx
c) Tan x
d) Cot x
Ans: a
Question: CMRR should be_____ for better
operation of op amp
a. high
b .low
c. maximum
d. None of
these
Ans: a
Question: ………… of measurement is a statement
of its consistency?
A. Accuracy
B. Precision
C. Validity
D.
Reliability
Ans: a
Question: A pointer of an instrument once
deflected returns to zero position, when current is removed, which is due to
a. action of
gravity
b. mass of
pointer
c. damping
torque
d.
controlling torque
Ans: d
Question: Circuit having identical polarity in
either direction is called?
a) Direct
Current
b)
Alternating Current
c) Above All
d) None of
these
Ans: a
Question: By increasing size of transformer.
Its frequency increases or decreases???
a) Increase
b) Decrease
c) Unchanged
d) None Of
these
Ans: c
Question: If a signal having different
frequency and different sampling frequencies are time division multiplexes then
it is
a. Pulse
stuffing
b.
Synchronous multiplexing
c.
Asynchronous multiplexing
d. FDMA
Ans: c
Question: A _____ meter is used a null
detector in wheat stone bridge
A. Ammeter
B. Voltmeter
C.
Galvanometer
D. None of
these
Ans: c
Question: FPGA is called
a)
Reprogrammable silicon chip
b)
Programmable routing resource
c)
Programmable Logic block
d) None of
these
Ans: c
Question: Length of the cable is doubled, its
capacitance C will be?
a.
one-fourth.
b. one-half.
c. double.
d.
unchanged.
Ans: c
Question: A Transformer is designed to be
operated on both 50 & 60 Hz frequency. For the Same rating, which one will
give more output;when
a. Operates
on 50 Hz
b. Operates
on 60 Hz
c. both a
& b
d. none of
the above.
Ans: a
Question: Control system is used for
A. Remote
control
b. power
application
c.
disturbance control
d. All of
the above
Ans: d
Question: Lower voltages like 66kv and 33kv
are consider to be
a)
distribution voltage
b)
Sub-transmission voltage
C) Flutter
voltage
d) Minor
transmission voltage.
Ans: b
Question: WHAT was the answer of RC SNUBBER?
a) It blocks
the sudden rise in voltage in SCR circuit.
b) It blocks
the sudden rise in current in SCR circuit.
c) It blocks
the sudden rise in frequency in SCR circuit.
d) Any of
the above
Ans: a
Question: Transmission voltage levels are
usually --------- and above
a. 110 kV
b- 130 kV
c- 140 kV
d- 150 kV
Ans: a
Question: Delta service is less expensive than
star why?
a) Because
Delta system uses less wire, as no neutral wire is used.
b) Because
Delta system uses more wire, as no neutral wire is used.
c) Because
Delta system uses less wire, with 1 neutral wire is used.
d) Any of
the above
Ans: a
Question: Active device is one which.
a-Supply
energy
b-absorb
energy
c-absorb and
convert one to another form
d-store and
convert from one form to another form
Ans: c
Question: Mathematical equation that allows us
to predict the value of dependent variable from known values of one or more
independent variable is called
a.
correlation equation
b.
distributive equation
c. variance
equation
d.
regression equation
e.
prediction equation
Ans: d
Question: The period of moon according to
keplers law where c= 1/100
a. 1 month
b. 2 month
c. 1 year
d. 2 year
Ans: a
Question: Increasing air gap magnetizing
current increases what happens to short circuit current
a. increases
b. decreases
c. for short
time increases then stable
d. remains
unchanged.
Ans: d
Question: Natural frequency of a system gives
a) nature of
transient
b) overshoot
c)
oscillation
d) speed of
response
Ans: c
Question: What is produced by super
conductors?
a. Voltage
b. Current
c.
Temperature,
d. Magnetic
field
Ans: d
Question: In super conductors what happens?
a. Repulsion
of Magnetic field
b. Absorbing
of magnetic field
c. Repulsion
of electric field
d. Absorbing
of electric field
Ans: a
Question: We are required to transmit
electricity using overhead line having length L, which will be the cheapest
method to transmit electricity
a. Two wire
DC
b. Single
phase AC
c. Three
phase 3 wire AC
d. Three
phase 4 wire AC
Ans: a
Question: In thevinen theorem, voltage source
is replaced by
a. Voltage
source in short circuit and current circuit in open circuit
b. Voltage
source in short circuit
c. current
circuit in open circuit
d. No change
Ans: a
Question: A device which allows passing
frequencies b/w two frequency limits is called
a) Band pass
filter
b) Band stop
filter
c) Full band
filter
d) Half band
filter
Ans: a
Question: To decrease the required power
output we use which control system
a) open
loop,
b) closed
loop,
c)
Combination of both.
d) None of
these
Ans:b
Question: When fault occurs, which action is
performed by circuit breaker.
a) opens the
CKT,
b) send
signal to trip
c) both
d) None of
These
Ans: a
Question: Which amplifier is used for pre
amplification??
A. class A
b. class b
C. class c
d. class d
Ans: a
Question: In a Line-to-ground fault system,
fault current is 1500 Amp, what would be zero sequence current? “,”a) 0 A
b) 500 A
c) 800 A
d) 1500 A
Ans: b
Question: If z transform lies in ROC then
a) System is
stable
b) Inverse
of system is stable
c) Both
system and its inverse are unstable
d) Both
system and its inverse are stable
Ans: d
Question: Which response has maximum shoot?
a. over
damped
b.
critically damped
c. under
damped
d. un-damped
Ans: c
Question: By connecting a shunt of higher
value in ammeter what will happen
a. Decrease
Current sensitivity
b. Increase
current sensitivity
c. remains
same
d. None of
these
Ans: a
Question: Inverse of even function is ?
a) Doesn’t
Exist
b) Exist
c) None of
these
Ans: a
Question: Due to the velocity saturation, The
MOSFET enters in saturation region.
a. at pinch
off
b. before
pinch off
c. after
pinch off.
d. none of
these
Ans: b
Question: Email is referred in
A. Vertical
communication
B.
Horizontal Communication
C. Downward
Communication
D. Upward
communication
Ans: b
Question: The flag register in 8051 is called?
a) program
status word (PSW) register
b) Indicator
Register
c) Both
above
d) None of
these
Ans: a
Question: Which country is Largest Electric
power producer?
A) México
B) USA
C) China
D) Canada
Ans: c
Question: Pulse shaping is done to what?
a) Maximize
the signal to noise ratio
b) Minimize
the signal to noise ratio
c) Unchanged
signal to noise ratio
d) Any of
the above
Ans: a
Question: Some pulses are detected incorrectly
at receiver due to
a.
quantization error
b. pulse
detection error (In almost all practical schemes, the pulse detection error is
very small compared to the quantization error and can be ignored)
c. frequency
error
d. 1 & 2
Ans: d
Question: For quantizing we limit
______________ of the message signal
a. frequency
(for sampling)
b. amplitude
c. energy
d. rate
Ans: b
Question: Signal characteristics are best
described for signals
a. radio
frequency
b. amplitude
c .phase
d. Any of
the Above
Ans: b
Question: Circular section of waveguide can be
described by using ______ wave guide
a. polar
b.
rectangular
c.
cylindrical (non polar)
d.
cylindrical (polar)
Ans: a
Question: Cladding in glass fiber _____ energy
loss from it
a. Increases
b. Reduces
c. Same
Ans: b
Question: The glass fiber is lighter, less
expensive and less bulky than the equivalent------------ cable
a. iron
b. copper
c. etc.
Ans: b
Question: An optical fiber excels at rejecting
a. EM
interference
b. RF
interference
c. cross
talk
d. all of
the above
Ans: d
Question: Fiber systems are particularly
suitable for the transmission of
_____ data
a. digital
b. analog
c. binary
d. modulated
Ans: d
Question: Mathematical expression of charge
conservation is equation of
a. Maxwell
b.
continuity
c. A and B
Ans: b
Question: Polarization of plane wave describes
the time varying behavior of
a.
Electrical field (Electric field intensity vector at a given point in space)
b. Magnetic
field
c. EM field
d. Electric
flux
Ans: a
Question: In array of antennas ___________ of
antenna are changed
a. frequency
b. amplitude
c. phase
80%?
d. signal
Ans: c
Question: Potential difference is
---------------------- between 2 points.
a) Electric
pressure / Electric tension
b) Magnetic
pressure
c) Lorentz
pressure
d) Ohmic
pressure
Ans: a
Question: Lactometer measures thickness and
relative densities of milk, it also tells us concentration of
a)
derivatives
b) fats
c) liquids
Ans: c
Question: EMF in closed path is
---------------------- integral of b/w 2 points
a) volume
b) surface
c) line
(Also called as Faraday’s integral Law)
Ans: c
Question: Which of the following is true about
discrete LTI system
a.
Convolution sum is approximation to convolution integral
b.
Convolution integral is approx to convolution sum
c.
Convolution sum and convolution integral are explicit realization
d. All of
the above
Ans: b
Question: Which of the following has super
linear rate of convergence
a. Bisection
(linear)
b. Newton
(quadratic )
c. Secant
d. False
position
e. Boyden
Ans: c
Question: The modulation technique in which
carrier is switched B/W 2 different carrier level 0-1 is called
a. Amplitude
shift keying
b. On off
keying
c. Frequency
modulation
d. Phase
modulation
Ans: a
Question: A permanent magnet coil meter has
which features
A. Low power
consumption
B. no
hysteresis loss
C. reduced
eddy current
D. reduced
damping & all of the above
Ans: d
Question: A LTI system can be completely
characterized by its
a. step
response
b. ramp
response
c. impulse
response
d. input
response
Ans: c
Question: LTI system is stable when
a. Zero is
inside a unit circle
b. Poles are
inside a unit circle
c. Zero at
origin
d. Poles at
origin
Ans: b
Question: In the frequency domain (s-plane),
the region of convergence must contain the unit circle (i.e., the locus
satisfying for complex z).
• ωn is
called the un-damped natural frequency
• ζ (zeta)
is called the damping ratio
• If ζ ≥ 1,
the poles are real (over damped)
• If 0
<ζ< 1, the poles are complex (under damped)
• If ζ = 1,
the poles are real: p1,2 = ±jωn (critically damped)
• If ζ <
0, the poles are in the right half plane (Re{p} > 0) and the system is
unstable
Question: In Z transform the region of
convergence must be centered at (For stability unit circle must be within ROC)
a. poles
b. zeros
c. origin
d. z=1 (
Z-transform converges when ROC is unity)
Ans: d
Question: Fourier series representing a
continuous signal requires _________ numbers of harmonically complex
exponentials
a. N
b. 2pi/N (It
is period of discrete time Fourier series)
c. n + N
d. infinite
Ans: d
Question: For LTI system if all poles and
zeros are inside circle
a. its
inverse doesn’t exist
b. it is
stable and casual system
c. both
system and its inverse are stable and casual
d. neither
system are table nor casual
Ans: c
Question: Z- Transform is used when signal is
not
a. absolute
sum able
b. square
sum able
c.
convergence
d.
divergence
e. a b and c
Ans: d
Question: If ROC does not include unit circle
then
a. Fourier
transform converges
b. z
transform convergence
c. Hartley
form convergence
d. chirp let
form convergence
Ans: a
Question: Any constant of time domain is a
impulse in f domain with
a. infinite
height, infinite width, infinite area
b. infinite
height, infinite width, unit area
c. infinite
height, zero width, unit area
d. infinite
height, unit width, Infinite area
Ans: c
Question: In s-plane horizontal axis
represents what? (It influences parameters such as rise time, settling time and
overshoot time. In left s-plane the increases exponentially while in RHS wave
amplitude decays exponentially.)
a. over
shoot time?
b. rise
time?
C. peak value
d. settling
time
Ans: d
Question: When surface charge density is zero
then normal component of _____ is continuous:
a)
Electromotive force / Electric Potential
b) MMF
c) etc
Ans: a
Question: Ampere’s law is comparable to
________ in electrostatics:
a. Biot
savart law
b. Gausses
law in electromegnatics
c. Faraday’s
law
d. Lenz's
law
Ans: b
Question: Radio waves are made up of
a.
Electrical Fields b.
b. Magnetic
Fields
c. Both A
& B
d. None of
the above.
Ans: c
Question: In CRO vertical scale is divided
into volts/div and the horizontal scale is..
a) divided
in time/div
b) divided
in freq/div
c) none of
these
d) A & B
Ans: a
Question: Which of the following is not a
purpose of disturbances monitoring equipment?
A. model
validation
B.
disturbance investigation
C. incorrect
protection settling
D. assessment
of system protection
Ans: c
Question: ___is like a 3 phase power system
and gives constant power
A. HVDC
B. split
phase
C. two phase
D. single
phase
Ans: c
Question: Commercial digital to analog
convertor module's are available with precision ranging from
6 bit
to---------
A.10
B.12
C.32
D.18
Ans: d
Question: In superposition theorem all voltage
sources are replaced by.........
A. open
circuit
B. closed
circuit
C. short
circuit
D. open
circuit with parallel branch
Ans: c
Question: Optical power depends on .........,
associated with the optical fiber receiver.
A. quantum
noise
B. dark
current noise
C. thermal
noise
D. all of
the above
Ans: d
Question: If R1 is the resistance of a coil of
copper at t 0C and RT is the resistance at T C and also the resistance
temperature coefficient of copper per degree centigrade at 0oC is 1/234.45,
then Rt / RT
(A) (1+t) /
(1+T)
(B) (1+
234.45t) / (1+234.45 T)
(C) (234.45
+ t) / (234.45 + T)
(D) (234.45
+ t2 ) / (234.45 + T 2).
Ans: c
Question: An amplifier has the following
critical frequencies: 1.2 kHz, 950 Hz, 8 kHz, and 8.5 kHz. The bandwidth is
A. 7550 Hz
B. 7300 Hz
C. 6800 Hz
D. 7050 Hz.
Ans: a
Question: Z-Transform is used when signal is
a. absolute
sum able
b. square
sum able
c.
convergence
d. a b and c
e.
divergence
Ans: d
Question: Z-Transform is used when signal is
not
a. absolute
sum able
b. square
sum able
c.
convergence
d.
divergence
e. a b and c
Ans: d
Question: Fault in transmission line are
-------% symmetrical ?
A) 10%
B) 5%
C) 15%
D) 20%
Ans: b
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