This set of DC Machines Questions and Answers for Aptitude test focuses on “Speed Control Using Armature Control in DC Motor”. 1. For which speed control method we get minimum efficiency? a) Voltage control method b) Field control method c) Armature control method d) Cannot be determined 2. The speed of a DC motor can … Read more
This set of Basic DC Machines Questions and Answers focuses on “Speed Control Using Field Control of Series Motor”. 1. Which of the following DC motor has the poorest speed control? a) Differentially compounded motor b) Cumulatively compounded motor c) Shunt motor d) Series motor 2. In variable speed motor ____________ a) Stronger commutating field … Read more
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Speed Control Using Field Control of Shunt Motor”. 1. The speed of a DC shunt motor can be increased by ______ a) Increasing the resistance in armature circuit b) Increasing the resistance in field circuit c) Reducing the resistance in the field … Read more
This set of DC Machines online quiz focuses on “Starting of DC Motors – 2”. 1. In three-point starter, as a starting handle is rotated __________ a) The resistance is added into armature circuit b) The resistance is removed from field circuit c) The resistance is added into field circuit d) Resistance is neither added … Read more
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Starting of DC Motors – 1”. 1. Why starters are required in a DC motor? a) Back emf of these motors is zero initially b) These motors are not self-starting c) These motors have high starting torque d) To restrict armature current … Read more
This set of DC Machines online test focuses on “DC Motor Basics – 2”. 1. Which of the following motor is used where high starting torque and wide speed range control is required? a) All motors b) Induction motor c) Synchronous motor d) DC motor 2. The armature voltage control of DC motor will provide … Read more
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “DC Motor Basics -1”. 1. What will happen if DC shunt motor is connected across AC supply? a) Will run at normal speed b) Will not run c) Will Run at lower speed d) Burn due to heat produced in the field … Read more
This set of DC Machines Multiple Choice Questions & Answers focuses on “Operating Characteristics of DC Compound Motor – 2”. 1. Net field current in a compound motor is given by ______________ a) If (net)= If + (Nse/Nf) Ia b) If (net)= If – (Nse/Nf) Ia c) If (net)= If + (Nf/Nse) Ia d) If … Read more
This set of DC Machines Multiple Choice Questions & Answers (MCQs) focuses on “Operating Characteristics of DC Compound Motor – 1”. 1. Differentially compound DC motors are used in applications requiring _______ a) High starting torque b) Low starting torque c) Variable speed d) Frequent on-off cycles 2. Which DC motor is more preferred for … Read more
This set of DC Machines MCQs focuses on “Operating Characteristics of DC Series Motor – 2”. 1. Which DC motor is generally preferred for cranes and hoists? a) Series motor b) Shunt motor c) Cumulatively compounded motor d) Differentially compounded motor 2. Which of the following motor has the poorest speed regulation? a) Shunt motor … Read more
