RASPBERRY PI EXAM 1 QUESTIONS AND
ANSWERS
What is a computer? - ANSWER A computer is a device that accepts
information (in the form of digitalized data) and manipulates it for some result
based on a program or sequence of instructions on how the data is to be
processed.
Computers also include the means for storing data (including the program,
which is also a form of data) for some necessary duration. A program may be
invariable and built into the computer (and called logic circuitry as it is on
microprocessors) or different programs may be provided to the computer
(loaded into its storage and then started by an administrator or user).
What is Raspberry Pi's Operating System? - ANSWER Variant of first Linux
Version "Debian" known as "Raspbian"
What are some applications software for Rasp Pi? - ANSWER Surf Internet
with a Browser, High Definition Video, Spreadsheets and Word Processing,
Games
What are some of the compilers and interpreters used with a Rasp Pi? -
ANSWER Compilers and Interpreters: C, C++, Java, Python, R, etc.
What is a Raspberry Pi? - ANSWER Raspberry Pi is a low cost, credit card
sized computer that can plug into a display monitor or TV, standard keyboard
and mouse, hard disk and USB storage devices and connect to the network
wired or wirelessly.
How much memory does a Raspberry Pi have? - ANSWER 1GB RAM
CPU of Raspberry Pi - ANSWER 1.2 GHz Quad-Core ARM Cortex
-(The ARM Cortex-A9 MPCore is a 32-bit processor core)
What's Headless mode? - ANSWER Raspberry Pi is typically used in
environments where attaching a display, keyboard, mouse, etc., is not feasible
due to environment factors, cost and not required by applications software .
, Operating a Raspberry Pi by directly accessing the OS terminal or the Desktop
via VNC over the network (WiFi or Ethernet) without the need for a monitor,
keyboard or a mouse is called Headless mode.
Duty Cycle - ANSWER T = 1/f
DC = Pulse Width/T
Duty cycle is the proportion of time during which a component, device, or
system is operated. In electronics, duty cycle is the percentage of the ratio of
pulse duration, or pulse width (PW) to the total period (T) of the waveform
How does a DC motor work? - ANSWER A DC Motor consists of an armature
(rotating part) a field. The field can consists of either a winding (electromagnet)
or permanent magnet.
(Small DC motors have permanent magnets as the field while large DC motors
have windings that forms an electromagnet.) Speed is varied by varying the
magnetic field intensity of the field.
Rotational Direction can be changed by reversing the polarity of the voltage
applied to the armature.
What is an H-bridge and how does it function? - ANSWER An H-bridge is
built of four switches that control the flow of current to a load. An H bridge is
an electronic circuit that enables a voltage to be applied across a load in
opposite direction. These circuits are often used in robotics and other
applications to allow DC motors to run forwards or backwards. For our DC
motor we use a SN754410 which is a Quadruple Half-H-Bridge capable of
controlling the rotational direction of two DC motors.
How does an H-bridge revers polarity? - ANSWER Enable where you want
the magnets to pull from to fine tune where you want the motor to turn.
What is a Servo Motor? - ANSWER Servomotor is a DC or AC Motor with a
potentiometer, gear assembly and a controlling circuit. Gear assembly is used to
reduce the speed and increase the torque.
(Servomotors are rated in kg/cm. The ratings indicate how much weight a
servomotor can lift at a particular distance.
ANSWERS
What is a computer? - ANSWER A computer is a device that accepts
information (in the form of digitalized data) and manipulates it for some result
based on a program or sequence of instructions on how the data is to be
processed.
Computers also include the means for storing data (including the program,
which is also a form of data) for some necessary duration. A program may be
invariable and built into the computer (and called logic circuitry as it is on
microprocessors) or different programs may be provided to the computer
(loaded into its storage and then started by an administrator or user).
What is Raspberry Pi's Operating System? - ANSWER Variant of first Linux
Version "Debian" known as "Raspbian"
What are some applications software for Rasp Pi? - ANSWER Surf Internet
with a Browser, High Definition Video, Spreadsheets and Word Processing,
Games
What are some of the compilers and interpreters used with a Rasp Pi? -
ANSWER Compilers and Interpreters: C, C++, Java, Python, R, etc.
What is a Raspberry Pi? - ANSWER Raspberry Pi is a low cost, credit card
sized computer that can plug into a display monitor or TV, standard keyboard
and mouse, hard disk and USB storage devices and connect to the network
wired or wirelessly.
How much memory does a Raspberry Pi have? - ANSWER 1GB RAM
CPU of Raspberry Pi - ANSWER 1.2 GHz Quad-Core ARM Cortex
-(The ARM Cortex-A9 MPCore is a 32-bit processor core)
What's Headless mode? - ANSWER Raspberry Pi is typically used in
environments where attaching a display, keyboard, mouse, etc., is not feasible
due to environment factors, cost and not required by applications software .
, Operating a Raspberry Pi by directly accessing the OS terminal or the Desktop
via VNC over the network (WiFi or Ethernet) without the need for a monitor,
keyboard or a mouse is called Headless mode.
Duty Cycle - ANSWER T = 1/f
DC = Pulse Width/T
Duty cycle is the proportion of time during which a component, device, or
system is operated. In electronics, duty cycle is the percentage of the ratio of
pulse duration, or pulse width (PW) to the total period (T) of the waveform
How does a DC motor work? - ANSWER A DC Motor consists of an armature
(rotating part) a field. The field can consists of either a winding (electromagnet)
or permanent magnet.
(Small DC motors have permanent magnets as the field while large DC motors
have windings that forms an electromagnet.) Speed is varied by varying the
magnetic field intensity of the field.
Rotational Direction can be changed by reversing the polarity of the voltage
applied to the armature.
What is an H-bridge and how does it function? - ANSWER An H-bridge is
built of four switches that control the flow of current to a load. An H bridge is
an electronic circuit that enables a voltage to be applied across a load in
opposite direction. These circuits are often used in robotics and other
applications to allow DC motors to run forwards or backwards. For our DC
motor we use a SN754410 which is a Quadruple Half-H-Bridge capable of
controlling the rotational direction of two DC motors.
How does an H-bridge revers polarity? - ANSWER Enable where you want
the magnets to pull from to fine tune where you want the motor to turn.
What is a Servo Motor? - ANSWER Servomotor is a DC or AC Motor with a
potentiometer, gear assembly and a controlling circuit. Gear assembly is used to
reduce the speed and increase the torque.
(Servomotors are rated in kg/cm. The ratings indicate how much weight a
servomotor can lift at a particular distance.
