8051 Microcontroller Mcqs
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122. What is the supply that a DS12887 consumes even when the power is switched off?
Lithium ion battery
Lead battery
Both of the mentioned
None of the mentioned
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123. What is the principle on which electromagnetic relays operate?
Electromagnetic induction
Motor control
Switching
None of the mentioned
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124. What are DPDT relays?
Single pole, single throw
Single pole, double throw
Double pole, double throw
None of the mentioned
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125. Why do we need a ULN2803 in driving a relay?
For switching a motor
For increasing the current limit in the relays
For increasing the power
For decreasing the current limit in the relays
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126. Why are solid relays advantageous over electromagnetic relays?
They need zero voltage circuit
They need less current to be energised
They need less voltage to be energised
None of the mentioned
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127. What are optoisolators?
It is a driver
It is a thing isolated from the entire world
It is a device that can be used as an electromagnetic relay without a driver
None of the mentioned
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128. How can we control the speed of a stepper motor?
By controlling its switching rate
By controlling its torque
By controlling its wave drive 4 step sequence
Cant be controlled
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129. Which of the following can be a unit for torque?
Kg/m^2
Ounce-inch
Kg-m^3
G/m
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130. The RPM rating given for the DC motor is for?
No-loaded
Loaded
None of the mentioned
All of the mentioned
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131. PWM allows the control of a DC motor with the same phase, but with different amplitude phases?
True
False
Cant be determined
None of the mentioned
132. How can the direction of the DC motor be changed?
By changing the torque
By changing the switching speed
By changing the polarity of voltages connected to the leads
By changing the RPM rating
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