1. A DC generator efficiency is maximum when: Constant loss – variable loss = 1 Variable loss – Constant loss = 1 Variable loss – Constant loss = 0 Variable loss + Constant loss = 1 2. DC generators are normally designed for maximum efficiency at or near _______ Full-load Minimum load Rated output …
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1. The efficiency of the DC motor at maximum power will be ________ 100% Around 90% Anywhere between 75% and 90% Less than 50% 2. Constant losses of DC motor can be measured by: Swinburne’s Test Retardation Test Hopkinson’s Test Load Test 3. The No-Load Test in DC Motor is known as ______ …
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1. The PWM control of DC motor varies _______ Linearly with speed Inversely with speed Parabolically with speed Exponentially with speed 2. The speed of DC shunt motor can be increased above its rated speed by Increasing the supply voltage within its rated value Increasing the flux per pole Decreasing the flux per pole …
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1. Differentially compound DC motors are used in applications requiring _______ High starting torque Low starting torque Variable speed Frequent on-off cycles 2. Which DC motor has got maximum self-loading property? Series motor Shunt motor Cumulative compound motor Differential compound motor 3. ______ DC motor Practically found no application. Series motor Shunt motor …
1. In a cumulative compound DC motor with rated voltage applied with rated load, if the series winding part is shorted, then speed will be: Less than full speed More than rated speed Same Zero 2. Net field current in a compound motor is given by _______ If (net)= If + (Nse/Nf) Ia If …
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1. For machine tools, which DC motor can be used? DC Series motor DC Shunt motor DC cumulative compound motor DC differential compound motor 2. As the load is increased the speed of DC shunt motor will ___________ Reduce slightly Increase slightly Increase proportionately Reduce rapidly 3. A 15 kW, 230 V dc …
1. In a cumulative compound DC motor with rated voltage applied with rated load, if the series winding part is shorted, then speed will be: Less than full speed More than rated speed Same Zero 2. Differentially compound DC motors are used in applications requiring _______ High starting torque Low starting torque Variable speed …
1. Which test is used to determine the efficiency of a traction motor? Field’s test Hopkinson’s test Retardation test Swinburne’s test 2. A 460 V series motor runs at 500 rpm taking a current of 40 A. Calculate the percentage change in torque if the load is changed so that the motor takes of …
1. For machine tools, which DC motor can be used? DC Series motor DC Shunt motor DC cumulative compound motor DC differential compound motor 2. As the load is increased the speed of the DC shunt motor will ___________ Reduce slightly Increase slightly Increase proportionately Reduce rapidly 3. A 15 kW, 230 V …
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1. In a cumulative compound DC motor with rated voltage applied with rated load, if the series winding part is shorted, then speed will be: Less than full speed More than rated speed Same Zero 2. Differentially compound DC motors are used in applications requiring _______ High starting torque Low starting torque Variable speed …
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