AP ECET ELECTRICAL AND ELECTRONICS ENGINEERING (EEE) Multiple Choice Questions (MCQs)

AP ECET Electrical and Electronics Engineering (EEE) - Unit X: Power Electronics and Microcontrollers

Multiple Choice Questions (136 - 150)

136. Which of the following is used for triggering an SCR?
     A) Diode
     B) UJT
     C) Transistor
     D) Photodiode
     Answer: B) UJT
137. What is the main application of a TRIAC in power electronics?
     A) Voltage regulation
     B) Frequency modulation
     C) Bidirectional power control
     D) Current regulation
     Answer: C) Bidirectional power control
138. What is the primary function of a DIAC in power electronics?
     A) Switch DC power
     B) Switch AC power
     C) To provide feedback to SCRs
     D) To store energy for later use
     Answer: B) Switch AC power
139. What is the working principle of a Cycloconverter?
     A) Converts AC to DC
     B) Converts DC to AC
     C) Converts high-frequency AC to low-frequency AC
     D) Converts low-frequency AC to high-frequency AC
     Answer: C) Converts high-frequency AC to low-frequency AC
140. In a Chopper, the output voltage is controlled by varying:
     A) Input voltage
     B) Pulse width
     C) Frequency
     D) Load resistance
     Answer: B) Pulse width
141. Which of the following is a feature of an Inverter?
     A) Converts AC to DC
     B) Converts DC to AC
     C) Provides constant voltage
     D) Converts low-frequency AC to high-frequency AC
     Answer: B) Converts DC to AC
142. Which of the following types of inverters produces a pure sinusoidal output?
     A) Square wave inverter
     B) Modified sine wave inverter
     C) Pure sine wave inverter
     D) Pulse-width modulation inverter
     Answer: C) Pure sine wave inverter
143. What is the main purpose of AC voltage regulators in power electronics?
     A) To control the voltage supply to induction motors
     B) To convert AC to DC
     C) To regulate current
     D) To switch DC circuits
     Answer: A) To control the voltage supply to induction motors
144. The speed of a DC motor can be controlled using:
     A) Inverters
     B) Converters and Choppers
     C) Cycloconverters
     D) AC Voltage Regulators
     Answer: B) Converters and Choppers
145. Which of the following methods is used to control the speed of an Induction Motor?
     A) Changing the voltage of the motor supply
     B) Using a V/F control method
     C) Using a fixed frequency supply
     D) None of the above
     Answer: B) Using a V/F control method
146. What is the basic working principle of a Switched Mode Power Supply (SMPS)?
     A) It uses linear voltage regulation
     B) It stores energy in capacitors
     C) It converts AC to DC using a high-frequency switch
     D) It directly regulates power using transformers
     Answer: C) It converts AC to DC using a high-frequency switch
147. What is the primary function of a UPS (Uninterruptible Power Supply)?
     A) To convert DC to AC
     B) To provide a backup power source during power failure
     C) To control the speed of motors
     D) To regulate the frequency of the AC supply
     Answer: B) To provide a backup power source during power failure
148. Which microcontroller is widely used in embedded systems for its versatility and ease of programming?
     A) 8051
     B) PIC
     C) Arduino
     D) Raspberry Pi
     Answer: A) 8051
149. Which of the following is a feature of the 8051 microcontroller architecture?
     A) 8-bit processor
     B) 16-bit processor
     C) 32-bit processor
     D) 64-bit processor
     Answer: A) 8-bit processor
150. Which of the following instruction types is NOT supported by the 8051 microcontroller?
     A) Arithmetic operations
     B) Logic operations
     C) Jump and call instructions
     D) Floating-point arithmetic
     Answer: D) Floating-point arithmetic

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