ROBOTICS -AUTOMATION-QUESTION BANK(1).pdf

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ROBOTICS AND AUTOMATION
UNIT I – BASIC CONCEPTS
PART – A
1. Define a Robot? (Apr 2014)
RIA defines a robot as a “programmable, multifunction manipulator designed to Move materials,
parts, tools or special devices through variable programmed motions for the performance of the variety of
task”.
2. What is meant by automation and what are its types?
Automation is a technology that is concerned with the use of electronic mechanical and computer based
system in the operation control and production.
Various types of automation:
 Fixed automation
 Programmable automation
 Flexible automation
3. Why a robot used?
a. To reduce production cost
 Fast
 Accurate
 Difficulties in human nature
b. To avoid 3-D jobs
 Dirty
 Dangerous
 Difficult
4. What is meant by robot anatomy?(Nov 2013)
Robot anatomy means study of structure of robot. Manipulator is constructed of a series of joints & links.
A joint provides relative motion between the input link and the output link. Each joint provides the robot
with one degree of freedom.
5. Write are the Benefits of industrial automation? (Apr 2014)
 Improved product quality
 Improved safety
 Increased manufacturing flexibility
 Improved operation reliability
 Improved decision making
6. Write Asimov’s laws of robotics?(Nov 2013)
Three rules written by science fiction author Isaac Asimov and later expanded upon. These rules are built
in to almost all positronic robots appearing in his fiction and cannot be bypassed. The rules are introduced
in his 1942 short story Runaround although they were foreshadowed in a few earlier stories.
The Three Laws of Robotics are as follows:
I. A robot may not injure a human being or, through inaction, allow a human being to come to
harm.
II. A robot must obey any orders given to it by human beings, except where such orders would
conflict with the First Law.
III. A robot must protect its own existence as long as such protection does not conflict with the
First or Second Law.
7. Classify the motion control of Robot arm?
 Limited sequence control
 Point to point control
 Continuous path control
 Intelligent control

8. What are the Advantages and disadvantages of robot?
Advantages
 Greater flexibility, reprogrammability, adjustable kinematics dexterity
 Greater response time to inputs than humans
 Improved product quality
 Maximize capital intensive equipment in multiple work shifts.
Disadvantages
 Replacement of human labour
 More unemployment
 Significant retraining costs for both unemployed and users of new technology
 Advertising technology does not always disclose some of the hidden disadvantages
9. Write about origin of robot.(Dec 2012)
The word robot was not even in the vocabulary of industrialists, let alone science fiction writers, until the
1920s. In 1920, Karel Cˇ apek (1890–1938) wrote the play, Rossum’s Universal Robots, commonly known
as R.U.R., which premiered in Prague in 1921, played in London in 1921, in New York in 1922, and was
published in English in 1923. As Cˇ apek wrote his play, he turned to his older brother, Josef, for a name to
call these manmade workers. Josef replied with a word he coined—robot.
10. What is degree of freedom? (Dec 2012)
It is described as one of the variables required to define the motion of a body in space. Each joint
in a robotic system gives the robot one degree of freedom.
PART B
1. Sketch and explain two views to indicate the work envelope of a (Nov 2013)
i) Cartesian robot.ii) Polar robot. iii) Cylindrical robot iv) Anthropomorphic robot
2. Explain in detail about robot specifications? Discuss the various generations of robots. (May 2013)
3. Sketch and explain the various robot configurations and with help of sketch describe pitch, yaw and
roll motion of a robot wrist
4. Explain a robot structure with a sketch. What are the various types of joints used in robots?(Dec 2014)
UNIT II – POWER SOURCES AND SENSORS
PART A
1. Define micro machines in robotics.
It deals with the controlled manipulation of objects with micrometer scale dimensions.
Micromanipulation is most effective process. It is concerned with construction and programming of
robots with overall dimensions at the microscale.
2. State the advantages and limitation of a hydraulic drive? (Nov 13)
Advantages:
 It gives greater speed and strength
 It gives highest power to weight ratio
 It is used for heavy pay loads
 It can be used for large working envelope
 It is safe and reliable to work in wet and dirty conditions
 It can be used in hazardous environment.
Disadvantages
 It occupies more space
 Maintenance should be done regularly
3. What are the types of hydraulic actuator? (May 14)
The types of hydraulic actuators are

 Linear hydraulic actuator
I. Single acting cylinder
II. Double acting cylinder
III. Double acting double rod cylinder
 Hydraulic rotary actuator
I. Gear motor
II. Vane motor
III. Piston motor
4. What is thresholding? What is segmentation?
Thresholding is a binary conversion technique in which each pixel is converted into a binary value either
black or white.
Segmentation is the method to group area of an image having similar characteristics or features into
distinct entities representing part of the image.
5. Describe the functions of machine vision system.
Sensing and digitizing image data
Image processing and analysis
Application
6. List out the basic lighting devices used in vision system.
Diffuse surface device
Condenser projectors
Flood or spot projectors
Collimator
Imagers
7. List out the applications of micro robots.
Medical field in surgery
Mining in hard core areas
Surveillance in border security
To monitor the dangerous microorganism in ocean
8. What is the role of tactile sensor? (May/June 2013)
Tactile sensors are employed wherever interactions between a contact surface and the environment are to
be measured and registered. Tactile sensors are useful in a wide variety of applications
for robotics and computer hardware and even security systems.
9. What is gear ratio? (May/June 2013)
The gear ratio of a gear train, also known as its speed ratio, is the ratio of the angular velocity of the input
gear to the angular velocity of the output gear. The gear ratio can be calculated directly from the numbers
of teeth on the gears in the gear train.
10. What are the desirable features of sensors? (Nov 13/May 14) What are the basic classifications of
sensors?
i. Accuracy
ii. Precision
iii. Operating Range
iv. Speed of response
v. Calibration
vi. Reliability
vii. Cost and ease of operation
Classifications of sensors
i. Tactile sensors
ii. Proximity sensors
iii. Range sensors
iv. Voice sensors etc
PART – B

1. With a neat block diagram, describe the different stages of machine vision system. (May/June 2013)
2. Describe electronic drive system for robots. What are the merits and demerits of DC motors? (May/June
2013).
3. Discuss in detail about the various types of sensors used in robotics. Distinguish between tactile and non-
tactile sensors. Sketch and explain the working of an acoustic sensor (May 14)
4. Sketch and explain pneumatic and hydraulic manipulator drives used for robots. (Nov 13)
UNIT III – MANIPULATORS, ACTUATORS AND GRIPPERS
PART - A
1. Draw the block diagram of manipulator and mention its building blocks.
2. List the advantages of electronic control circuit of manipulator.
The electronics control system has following advantages
Very compact and small in size
Consumes very less power
Very fast in response
Much more accurate and efficient than conventional system
Wide control ranges
Economical, since maintenance cost is minimum
Highly protective.
3.List the advantages of pneumatic control circuit of manipulator.
The advantages of are Pneumatic control circuits are
Exhaust air is released directly into the atmosphere
Most pneumatic circuits employ a centralised compressor as their source of energy.
The input to the circuit is fixed at some conveniently located manifold which leads directly into the
FRL (Filter Regulator Lubricator) unit.
4.What are the different methods of speed control of DC motors used in manipulator?
DC motor speed can be controlled using thyristors, some methods are
Armature voltage control methods (also called phase control method of speed control.)
Power conversion
unit
Controller
Manipulator
linkage & base
User
interface
Actuators
Sensors

D C chopper speed control (A chopper can give variable D.C at its output)
Speed control by using a dual converter (includes rectifier and inverter.)
5. Define End effector. (Nov 2013)
End effector is a device that is attached to the end of the wrist arm to perform specific task.
6. What is meant by gripper? Mention its classifications.
Gripper is a End effector which can hold or grasp the object .
Grippers may be classified based on
single and multiple gripper
External gripper, internal gripper
Mechanical grasping devices, magnets, suction cups.
7. .Briefly explain about mechanical grippers. (May 2014)
A mechanical gripper is an end effector that uses mechanical fingers actuated by a mechanism to
grasp an object.The fingers (jaws) make contact with the object. The fingers are either attached or
integral part of the mechanism. Fingers are interchangeable to accommodate different parts. Two
fingers are sufficient to hold the work part. Grippers with three or more fingers are less common.
8. List the advantages and features of suction cup gripper? (May 2014)
a) Require only one surface of the part for grasping,
b) Applies uniform pressure distribution on the surface of the part,
c) Relatively a lightweight gripper,
d) Applicable to a variety of different material.
9. What are the merits and demerits of magnetic gripper? (Nov 2013)
Advantages: Pickup time very fast, Variation in part size can be tolerated, The gripper do not have to
be designed for one particular work part, They have ability to handle metal parts with holes, They
require only one surface for gripping
Disadvantages: Residual magnetism, Side slippage, More than one sheet will be lifted by magnet
from a stack
10. What is a stripping device? When it is required?
The device which accomplishes this separation technique is called a stripper or stripping device. Its
function is to mechanically detach the part from magnet. Permanent magnets are used for handling
tasks in hazardous environments requiring explosion proof apparatus. i.e no electrical circuit is
needed to operate the magnet reduces the danger of sparks which cause ignition
11. List any four considerations in gripper design.
The part surface to be grasped must be reachable.
The size variation of the part must be accounted.
The gripper design must accommodate the change in size that occurs between part loading
and unloading.
The scratching and distorting the part during gripping must considered.
Gripper fingers can be designed to conform to the part shape.
12. List some top priority guidelines in gripper selection
Part to be handled, Actuation method, Power and signal transmission, Gripper force, Operating
condition, Fabrication materials, etc
PART B
1. What are the different types of gripper mechanism used for robots manipulator? Explain in detail about
the magnetic, vacuum grippers, inflated devices and adhesives grippers. (Nov 2013/May 2015)

2. Discuss in detail about the construction of a manipulator. ii) Discuss in detail various types mechanical
grippers. (Nov 2013/May 2014)
3. Explain the different types of speed control methods using electronic components and circuits to control
the robot motions? (May 2015)
4. What are the design considerations in selection of a gripper? Explain the different types of speed control
methods using pneumatic circuits to control the robot motions)(Nov 2013)
UNIT IV – KINEMATICS AND PATH PLANNING
PART A
1. Determine the coordinates of robot having arm length of 300 mm, its initial position is (10,20) and
rotates at an angle of 45 deg. Clockwise. (Nov/Dec 2012)













1
0
20
10
initial
p
;
unit vector corresponds to 30° rotation in clockwise is















1
0
)
45
sin(
)
45
cos(
u







































1
0
293
.
19
707
.
10
1
0
20
10
1
0
0
0
0
1
0
0
707
.
0
0
1
0
707
.
0
0
0
1
final
p
2. Find out the link length and angle of twist at robot joint if the end effector is located at (0.7, 0.7)
(Nov/Dec 2012)
0.7 = L1cosθ1 (1)
0.7= L1sinθ1 (2)
eqn 2/eqn1
tan θ1=0.7/0.7 = 1 θ1=45
L1 = 1
3. What is forward kinematics and where it can be applied? (May/June 2013)
Kinematics is the study of motion without regarding forces that cause it. Forward kinematics is the
determination of the position of the robot end effector in the world coordinate system by knowing the
joint angles and the link parameter of the robot. It is used to calculate the position and orientation of the
end-effector in terms of the joint variables.
4. What is inverse kinematics?
Kinematics is the study of motion without regarding the forces that cause it. Inverse kinematic is the
calculation of joint values given the positions, orientations, and geometries of robot links.
5. What is homogeneous transformation?

Homogeneous transformation provides the mathematics for describing points with preferred orientations
in three dimensional space. Using the homogeneous transformations, a serial links of manipulator may be
modeled as a set of reference frames whose relative positions and orientations are determined by the
values of the joint variables.
6. Define jacobian in the field of Robotics.
The jacobian is a multidimensional form of the derivative. Jacobians are time varying linear
transformations. In the field of robotics jacobians relate joint velocities to Cartesian velocities of the tip of
the arm.
°ʋ = °J(θ)


The number of rows of J(θ)equals the number of degrees of freedom in the Cartesian space being
considered. The number of columns is equal to the number of joints of the manipulator.
7. Write the rotational transformation matrix of a point when it is rotated by an angle θ with respect
to x axis, rotated by an angle θ with respect to y axis, rotated by an angle θ with respect to z axis of
a three coordinate system
Rot(x,θ) =















1
0
0
0
0
cos
sin
0
0
sin
cos
0
0
0
0
1




Rot(y,θ) =















1
0
0
0
0
cos
0
sin
0
0
1
0
0
sin
0
cos




Rot(z,θ) =













 
1
0
0
0
0
1
0
0
0
cos
sin
0
0
sin
cos




8. Write the overall transformation matrix when both rotation and translation of a point in a three
coordinate system.
T =














1
0
0
0
z
z
z
z
y
y
y
y
x
x
x
x
p
a
o
n
p
a
o
n
p
a
o
n
9. Brief hill climbing techniques.
Hill climbing is a mathematical optimization technique which belongs to the family of local search. Hill
climbing is used for solving computationally hard problems. It is best used in problems with “the property
that the state description itself contains all the information needed for a solution” .The algorithm is
memory efficient since it does not maintain a search tree: It looks only at the current state and immediate
future states.
10. What is teach pendant?
The teach pendant is usually a small handheld control box with combinations of toggle switches, dials and
buttons to regulate the robot’s physical movements and program capabilities.
11. Name the basic elements and functions of robot language. (Nov 2013)
 Constants, variables and other data objects
 Motion commands

 End effector and sensor commands
 Computations and operations
 Program control and subroutines
 Communications and data processing
 Monitor mode commands
12. What are the advantages of off-line robot programming? (May/June 2013)
 Reducing the onsite programming time
 Reducing the downtime of equipment when programming new workpieces/variants
 Programming complex paths (for example, deburring, welding in tight spaces, grinding,
polishing, etc, which are highly time consuming
PART B
1. a. Determine the coordinates of end effector point of joint J1,twist by and angle of 50 deg and variable
link has length of 500mm. Assume it is a TL robot and coordinate system is defined at joint J2. (Nov/Dec
2012)
b. Discuss about hill climbing technique of robot.(Nov 2013)
2. a.In RR robot the origin of the global coordinate system is at J1 has two links of length 800mm.
determine the coordinate of the end effector point if the joint rotations are 65 deg at both joints, and
determine joint rotations if end effector is locates at (10,20).
b.Discuss about jacobian work envelope with example. (Nov/Dec 2012)
3. What is robot software? List the advantages and disadvantages of off-line programming?
(Nov 2013/Apr 2014)
4. a. Discuss the different inputs to an inverse kinematics algorithm. Explain the solution of a simple inverse
kinematic algorithm. (Nov 2014)
b.. Derive the forward kinematic equation of RR robot. (May 2015)
b. A 2D two link robot has length L1=5cm and L2 =4cm and end effectors position at [Xp Yp] is (3.5,
7.5). Find joint angle between link 1 and the ground surface. (May 2015)
UNIT V – CASE STUDIES
PART A
1. Write some industrial application of robot?
a). Material handling application
 Material transfer application
 Machine loading/unloading application
b). Processing application
 Welding
 Painting
 Assembly
 Inspection
2. What are the benefits of industrial robot? (April 2014)
Industrial robot offers the following benefits
 Increase productivity
 Improve product quality

 More consistent product quality
 Reduce scrap and waste
 Reduce reworking costs
 Reduce raw goods inventory
 Direct labour cost saving
 Saving in overhead cost such as lighting, heating and cooling
3. What is palletizing and depalletizing?
Palletizing is the operation in which the robot picks cartons from conveyor and places them on to a pallet
Depalletizing operation is the reverse of palletizing operation in which the robot removes cartons from the
pallet and places them on to conveyor or other location
4. What are the different types of material handling operation? (Nov 2013)
 Picking and placing
 Palletizing and depalletizing
 Machine loading and unloading
 Parts feeding , storage and retrival
 Sorting of the parts from conveyors
5. Define the term “CIM”. (April 2014)
The term CIM denotes the use of computer pervasive use of computer system to design the product, plan
the product, control the operations and perform the various business related function.
6. What are parts feeding, storage and retrieval Process?
 Parts feeding means feeding the part to the machine
 Storage means storing different types of object in the pallet
 Retrieval is the process of taking the object from the pallet
7. What is assembly? What are the types of assembly operation?
The term assembly is defined to mean the fitting of two or more discrete parts to form a new subassembly.
 Parts mating
 Parts joining
8. Define part presentation and Explain bowl feeders?
In order to perform an assembly task the part that is to be assembled must be presented to robot this is
called part presentation
Bowl feeders are devices used for feeding and orienting small parts in automated assembly operations.
They are made two main components
 The bowl
 The vibrating base
9. Explain designing for robot assembly. (Nov 2013)
 Certain assembly tasks are very difficult for the robot to perform than others. If possible this
difficulty factor should be consider in the design of product
 Another consideration in the design of an assembly is the direction in which the parts are to
be added in the assembly operation
10. What are the functions of work cell controller? (May/June 2013)
Robot workcell controller (also known as the robot workstation controller) is employed
forcontrolling the different activities that take place successively or simultaneously in the workplace. It
also includes one important aspect of providing safety to the human operators. There are three types of
tasks carried out by the workcell controller such as:
Sequence Control
Operator Interface
Safety Monitoring
11. List any four non-manufacturing application areas of robotics. (May/June 2013)
Navigation, Space, Medical surgery, teaching aids
PART B

1. With suitable diagram, explain industrial application of robot in non-manufacturing field. (Nov 2014)
Write a detailed note on robot computer interface and robot cell design. (May/June 2013)
2. What is spot welding? Describe briefly the operations involved in robotic spot welding. What are
advantages of robotic welding over manual welding? (April 2014)
3. Static characteristics of work which promote application of robots. Discuss robot application for
assembly and inspection. (April 2014) / (Nov 2014)
4. Write short notes: (Apr 2015)
(i)Robot Cell Layouts.
(ii)Selection of a Robot.
5. What is the need of robots and automation in following applications?(Apr 2015)
(i)Welding
(ii)Die casting
(iii)Palletizing

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