MECHATRONICS UPDATED QUESTIONS AND SOLUTIONS
RATED A+
✔✔Which of the following statements is not true about brushless motors? - ✔✔high
maintenance
✔✔A stepper motor is specified as having a step angle of 6º. This means that:
(i) Each pulse input to the motor rotates the motor shaft by 6º.
(ii) An input of 300 pulses per second will cause it to rotate at 5 rev/s.
Which option BEST describes the two statements? - ✔✔t t
✔✔For a series wound DC motor:
(i) The direction of rotation of its shaft can be reversed by reversing the polarity of the
voltage supplied to the motor (i.e. the direction of the current).
(ii) The speed of rotation of the motor shaft can be controlled by varying the size of the
current supplied to the motor. - ✔✔f t
✔✔ Analog signal are signals that are: - ✔✔Continuous functions of time
✔✔Embedded systems are: - ✔✔machines with micro controllers embedded into them
✔✔The following picture is best defined as a: - ✔✔system with feedback control
✔✔Which of the following is not a typical attribute of open-loop control systems. -
✔✔Relatively accurate in matching actual to required values
✔✔box\block diagrams represent the behavior of a real system by mathematical
equations and are often described by a differential equation. - ✔✔True
✔✔The term ........ is used for the element of a correction unit that provides the power to
carry out the control action. - ✔✔actuator
✔✔A DAC is the device that converts - ✔✔a digital signal into an analog signal.
✔✔In a flow chart, Input/Output Operations: - ✔✔Are represented by parallelograms;
indicate an input or output operation.
✔✔n a flow chart, a terminal: - ✔✔Is represented by rounded rectangles; indicate a
starting or ending point.
✔✔A pressure sensor has a range of 0 to 1,000 kPa and a non-linearity error of ±0.15%
of the full range. The error for a reading of 700 kPa is: - ✔✔±1.5 kPa
, ✔✔Pseudocode is based on: - ✔✔No coding language in particular as it is just
instructions written in plain English.
✔✔The true speed of a car is 56 mph. The speedometer reading though is 54 mph.
How much is the error in the measurement? Provide only the number without units. -
✔✔-2
✔✔Transducers can give different outputs for the same measured value depending
whether this value is reached by continuously increasing or decreasing change. What
kind of error is this? - ✔✔Hysteresis error
✔✔An incremental encoder has 180 slots on the disc. Express the resolution in
degrees: - ✔✔2
✔✔You develop a program that calculates taxes. What would be a proper variable
name to express the adjusted gross income? - ✔✔adjustedGrossIncome
✔✔The Linear Variable Differential Transformer (LVDT) is used as primary transducer
for monitoring: - ✔✔displacement
✔✔Which of the following terms is not used to define the performance of a transducer?
- ✔✔size
✔✔For the repetition structure shown in the figure, which one of the following
statements would not create an infinite loop? - ✔✔y=y-1
✔✔An electrical resistance strain gauge, with a gauge factor of 2.5 and a resistance of
50 Ω, is getting a change in resistance of 1.25 Ω. How much is the measured strain?
Provide only the number without units. - ✔✔0.01
✔✔The dynamic characteristics of a transducer refer to values given when steady-state
conditions occur. - ✔✔False
✔✔A shaft encoder is to be used with a 40mm radius tracking wheel to monitor linear
displacement. If the encoder produces 512 pulses per revolution, what will be the
number of pulses produced by a linear displacement of 150mm? Provide only the
number without units. - ✔✔305.5 2pi*40. (150/2pi40)*512
✔✔A potentiometer consists of a resistance element with a sliding contact to: -
✔✔change the resistance of a sensor
✔✔Micro instruments make a strain gauge (MMF404146) with a resistance of 350 ohms
and a gauge factor of 2.09. If the strain gauge, when applied to a surface, reads 350
RATED A+
✔✔Which of the following statements is not true about brushless motors? - ✔✔high
maintenance
✔✔A stepper motor is specified as having a step angle of 6º. This means that:
(i) Each pulse input to the motor rotates the motor shaft by 6º.
(ii) An input of 300 pulses per second will cause it to rotate at 5 rev/s.
Which option BEST describes the two statements? - ✔✔t t
✔✔For a series wound DC motor:
(i) The direction of rotation of its shaft can be reversed by reversing the polarity of the
voltage supplied to the motor (i.e. the direction of the current).
(ii) The speed of rotation of the motor shaft can be controlled by varying the size of the
current supplied to the motor. - ✔✔f t
✔✔ Analog signal are signals that are: - ✔✔Continuous functions of time
✔✔Embedded systems are: - ✔✔machines with micro controllers embedded into them
✔✔The following picture is best defined as a: - ✔✔system with feedback control
✔✔Which of the following is not a typical attribute of open-loop control systems. -
✔✔Relatively accurate in matching actual to required values
✔✔box\block diagrams represent the behavior of a real system by mathematical
equations and are often described by a differential equation. - ✔✔True
✔✔The term ........ is used for the element of a correction unit that provides the power to
carry out the control action. - ✔✔actuator
✔✔A DAC is the device that converts - ✔✔a digital signal into an analog signal.
✔✔In a flow chart, Input/Output Operations: - ✔✔Are represented by parallelograms;
indicate an input or output operation.
✔✔n a flow chart, a terminal: - ✔✔Is represented by rounded rectangles; indicate a
starting or ending point.
✔✔A pressure sensor has a range of 0 to 1,000 kPa and a non-linearity error of ±0.15%
of the full range. The error for a reading of 700 kPa is: - ✔✔±1.5 kPa
, ✔✔Pseudocode is based on: - ✔✔No coding language in particular as it is just
instructions written in plain English.
✔✔The true speed of a car is 56 mph. The speedometer reading though is 54 mph.
How much is the error in the measurement? Provide only the number without units. -
✔✔-2
✔✔Transducers can give different outputs for the same measured value depending
whether this value is reached by continuously increasing or decreasing change. What
kind of error is this? - ✔✔Hysteresis error
✔✔An incremental encoder has 180 slots on the disc. Express the resolution in
degrees: - ✔✔2
✔✔You develop a program that calculates taxes. What would be a proper variable
name to express the adjusted gross income? - ✔✔adjustedGrossIncome
✔✔The Linear Variable Differential Transformer (LVDT) is used as primary transducer
for monitoring: - ✔✔displacement
✔✔Which of the following terms is not used to define the performance of a transducer?
- ✔✔size
✔✔For the repetition structure shown in the figure, which one of the following
statements would not create an infinite loop? - ✔✔y=y-1
✔✔An electrical resistance strain gauge, with a gauge factor of 2.5 and a resistance of
50 Ω, is getting a change in resistance of 1.25 Ω. How much is the measured strain?
Provide only the number without units. - ✔✔0.01
✔✔The dynamic characteristics of a transducer refer to values given when steady-state
conditions occur. - ✔✔False
✔✔A shaft encoder is to be used with a 40mm radius tracking wheel to monitor linear
displacement. If the encoder produces 512 pulses per revolution, what will be the
number of pulses produced by a linear displacement of 150mm? Provide only the
number without units. - ✔✔305.5 2pi*40. (150/2pi40)*512
✔✔A potentiometer consists of a resistance element with a sliding contact to: -
✔✔change the resistance of a sensor
✔✔Micro instruments make a strain gauge (MMF404146) with a resistance of 350 ohms
and a gauge factor of 2.09. If the strain gauge, when applied to a surface, reads 350
