Digital Electronic MCQ Set 1
1. 4 to 1 MUX would have
a) 2 inputs
b) 3 inputs
c) 4 inputs
d) 5 inputs
Answer
Answer: c [Reason:] 4 to 1 multiplexer would have 4 inputs. It can be observed from this diagram:
2. The two input MUX would have
a) 1 select line
b) 2 select lines
c) 4 select lines
d) 3 select lines
Answer
Answer: a [Reason:] The two input multiplexer would have 1 select lines.
3. A combinational circuit that selects one from many inputs
a) Encoder
b) Decoder
c) Demultiplexer
d) Multiplexer
Answer
Answer: d [Reason:] A combinational circuit that selects one from many inputs is known as Multiplexer.
4. 4 to 1 MUX would have
a) 1 output
b) 2 outputs
c) 3 outputs
d) 4 outputs
Answer
Answer: a [Reason:] 4 to 1 MUX would have 1 outputs.
5. Which of the following circuit can be used as parallel to serial converter?
a) Multiplexer
b) Demultiplexer
c) Decoder
d) Digital counter
Answer
Answer: a [Reason:] In multiplexer, different inputs are inserted parallely and then it gives one output which is in serial form.
6. A combinational circuit is one in which the output depends on the
a) Input combination at the time
b) Input combination and the previous output
c) Input combination at that time and the previous input combination
d) Present output and the previous output
Answer
Answer: a [Reason:] A combinational circuit is one in which the output depends on the input combination at the time.
7. Without any additional circuitry an 8:1 MUX can be used to obtain
a) Some but not all Boolean functions of 3 variables
b) All function of 3 variables but none of 4 variables
c) All functions of 3 variables and some but not all of 4 variables
d) All functions of 4 variables
Answer
Answer: d [Reason:] A 2^n:1 MUX can implement all logic functions of (n+1) variables without any additional circuitry. Thus 8:1 MUX can implement all logic functions of (3+1) variables, for 4 variables there are 16 possible combinations. So to use 8:1 MUX use 3 inputs as select lines of MUX and the 4th input as input of MUX.
8. A basic multiplexer principle can be demonstrated through the use of a
a) Single-pole relay
b) DPDT switch
c) Rotary switch
d) Linear stepper
Answer
Answer: c [Reason:] A basic multiplexer principle can be demonstrated through the use of a rotary switch. Because rotary switch gives one output corresponding to their inputs.
9. One multiplexer can take the place of
a) Several SSI logic gates
b) Combinational logic circuits
c) Several Ex-NOR gates
d) Several SSI logic gates or combinational logic circuits
Answer
Answer: d [Reason:] One multiplexer can take the place of several SSI logic gates or combinational logic circuits because it has a lot of functions to perform different operations.
10. The inputs/outputs of an analog multiplexer/demultiplexer are
a) Bidirectional
b) Unidirectional
c) Even parity
d) Binary-coded decimal
Answer
Answer: a [Reason:] One multiplexer can be used as demultiplexer. Hence, it is called bidirectional.
11. If enable input is high then the multiplexer is
a) Enable
b) Disable
c) Saturation
d) None of the Mentioned
Answer
Answer: b [Reason:] If enable input is high then the multiplexer is disabled because enable input is in inverted mode always (i.e. E’).
12. What is data routing in a multiplexer?
a) It spreads the information to the control unit
b) It can be used to route data from one of several source to destination
c) It is an application of multiplexer
d) Both it can be used to route data and it is an application of multiplexer
Answer
Answer: d [Reason:] Data routing is an application of multiplexer and it can be used to route data from one of several source to destination.
Digital Electronic MCQ Set 2
1. Which of the following is a receptor in the retina of human eye?
a) Rods
b) Cones
c) Rods and Cones
d) Neither Rods nor Cones
Answer
Answer: c [Reason:] Rods are long slender receptors while cones are shorter and thicker receptors.
2. How is image formation in the eye different from that in a photographic camera
a) No difference
b) Variable focal length
c) Varying distance between lens and imaging plane
d) Fixed focal length
Answer
Answer: b [Reason:] Fibers in ciliary body vary shape of the lens thereby varying its focal length.
3. Range of light intensity levels to which the human eye can adapt (in Log of Intensity-mL)
a) 10-6 to 10-4
b) 104 to 106
c) 10-6 to 104
d) 10-5 to 105
Answer
Answer: c [Reason:] Range of light intensity to which human eye can adapt is enormous
and about the order 1010 from 10-6 to 104.
4. What is subjective brightness?
a) Related to intensity
b) Related to brightness
c) Related to image perception
d) Related to image formation
Answer
Answer: a [Reason:] It is the intensity as perceived by the human eye.
5. What is brightness adaptation?
a) Changing the eye’s overall sensitivity
b) Changing the eye’s imaging ability
c) Adjusting the focal length
d) Transition from scotopic to photopic vision
Answer
Answer: a [Reason:] The human eye a wide dynamic range by changing the eye’s overall sensitivity and this is called brightness adaptation.
6. The inner most membrane of the human eye is
a) Blind Spot
b) Sclera
c) Choroid
d) Retina
Answer
Answer: d [Reason:] Retina is the innermost membrane of the human eye.
7. What is the function of Iris?
a) Source of nutrition
b) Detect color
c) Varies focal length
d) Control amount of light
Answer
Answer: d [Reason:] Iris is responsible for controlling the amount of light that enters the human eye.
8. ________ serve to a general, overall picture of the field of view.
a) Cones
b) Rods
c) Retina
d) All of the Mentioned
Answer
Answer: b [Reason:] Rods produce an overall picture of the field of view.
9. Ratio of number of rods to the number of cones is _______
a) 1:20
b) 1:2
c) 1:1
d) 1:5
Answer
Answer: a [Reason:] No of rods: 6 to 7 million, No of rods: 75 to 150.
10. The absence of receptors is in the retinal area called _______
a) Lens
b) Ciliary body
c) Blind spot
d) Fovea
Answer
Answer: c [Reason:] Except the blind spot, receptors are radially distributed.
Digital Electronic MCQ Set 3
1. What is accepting or rejecting certain frequency components called as?
a) Filtering
b) Eliminating
c) Slicing
d) None of the Mentioned
Answer
Answer: a [Reason:] Filtering is the process of accepting or rejecting certain frequency components.
2. A filter that passes low frequencies is _______
a) Band pass filter
b) High pass filter
c) Low pass filter
d) None of the Mentioned
Answer
Answer: c [Reason:] Low pass filter passes low frequencies.
3. What is the process of moving a filter mask over the image and computing the sum of products at each location called as?
a) Convolution
b) Correlation
c) Linear spatial filtering
d) Non linear spatial filtering
Answer
Answer: b [Reason:] The process is called as Correlation.
4. The standard deviation controls _____ of the bell (2-D Gaussian function of bell shape).
a) Size
b) Curve
c) Tightness
d) None of the Mentioned
Answer
Answer: c [Reason:] The standard deviation controls “tightness” of the bell.
5. What is required to generate an M X N linear spatial filter?
a) MN mask coefficients
b) M+N coordinates
c) MN spatial coefficients
d) None of the Mentioned
Answer
Answer: a [Reason:] To generate an M X N linear spatial filter MN mask coefficients must be specified.
6. What is the difference between Convolution and Correlation?
a) Image is pre-rotated by 180 degree for Correlation
b) Image is pre-rotated by 180 degree for Convolution
c) Image is pre-rotated by 90 degree for Correlation
d) Image is pre-rotated by 90 degree for Convolution
Answer
Answer: b [Reason:] Convolution is the same as Correlation except that the image must be rotated by 180 degrees initially.
7. Convolution and Correlation are functions of _______
a) Distance
b) Time
c) Intensity
d) Displacement
Answer
Answer: d [Reason:] Convolution and Correlation are functions of displacement.
8. The function that contains a single 1 with the rest being 0s is called ________
a) Identity function
b) Inverse function
c) Discrete unit impulse
d) None of the Mentioned
Answer
Answer: c [Reason:] It is called Discrete unit impulse.
9. Which of the following involves Correlation?
a) Matching
b) Key-points
c) Blobs
d) None of the Mentioned.
Answer
Answer: a [Reason:] Correlation is applied in finding matches.
10. An example of a continuous function of two variables is ____
b) Intensity function
c) Contrast stretching
d) Gaussian function
Answer
Answer: d [Reason:] Gaussian function has two variables and is an exponential continuous function.
Digital Electronic MCQ Set 4
1. What is the set generated using infinite-value membership functions, called?
a) Crisp set
b) Boolean set
c) Fuzzy set
d) All of the mentioned
Answer
Answer: c [Reason:] It is called fuzzy set.
2. Which is the set, whose membership only can be true or false, in bi-values Boolean logic?
a) Boolean set
b) Crisp set
c) Null set
d) None of the mentioned
Answer
Answer: b [Reason:] The so called Crisp set is the one in which membership only can be true or false, in bi-values Boolean logic.
3. If Z is a set of elements with a generic element z, i.e. Z = {z}, then this set is called _______
a) Universe set
b) Universe of discourse
c) Derived set
d) None of the mentioned
Answer
Answer: b [Reason:] It is called the universe of discourse.
4. A fuzzy set ‘A’ in Z is characterized by a ______ that associates with element of Z, a real number in the interval [0, 1].
a) Grade of membership
b) Generic element
c) Membership function
d) None of the mentioned
Answer
Answer: c [Reason:] A fuzzy set is characterized by a membership function.
5. A fuzzy set is ________ if and only if membership function is identically zero in Z.
a) Empty
b) Subset
c) Complement
d) None of the mentioned
Answer
Answer: a [Reason:] It is called an Empty set.
6. Which of the following is a type of Membership function?
a) Triangular
b) Trapezoidal
c) Sigma
d) All of the mentioned
Answer
Answer: d [Reason:] All of them are types of Membership functions.
7. Which of the following is not a type of Membership function?
a) S-shape
b) Bell shape
c) Truncated Gaussian
d) None of the mentioned
Answer
Answer: d [Reason:] All of the mentioned above are types of Membership functions.
8. Using IF-THEN rule to create the output of fuzzy system is called ___.
a) Inference
b) Implication
c) Both the mentioned
d) None of the mentioned
Answer
Answer: c [Reason:] It is called Inference or Implication.
9. What is the independent variable of fuzzy output?
a) Maturity
b) Membership
c) Generic Element
d) None of the mentioned
Answer
Answer: a [Reason:] Maturity is the independent variable of fuzzy output.
10. Which of the following is not a principle step in fuzzy technique?
a) Fuzzify input
b) Apply implication method
c) Defuzzify final output
d) None of the mentioned
Answer
Answer: d [Reason:] All of the mentioned above are key steps in fuzzy technique.
