1. In DC chopper, the waveform for input and output voltages is respectively __________ A. Discontinuous and Continuous B. Continuous and Discontinuous C. Both continuous D. Both discontinuous 2. A chopper behaves as a __________ A. DC equivalent of AC switching device B. DC equivalent of AC transformer C. DC equivalent of AC relay …
1. In DC chopper, the waveform for input and output voltages is respectively __________ A. Discontinuous and Continuous B. Continuous and Discontinuous C. Both continuous D. Both discontinuous 2. A chopper behaves as a __________ A. DC equivalent of AC switching device B. DC equivalent of AC transformer C. DC equivalent of AC relay …
1. In DC chopper, the waveform for input and output voltages is respectively __________ A. Discontinuous and Continuous B. Continuous and Discontinuous C. Both continuous D. Both discontinuous 2. A chopper behaves as a __________ A. DC equivalent of AC switching device B. DC equivalent of AC transformer C. DC equivalent of AC relay …
1. Swinburne’s test can be conducted on ___________ A. Series motor B. Shunt motor C. Compound motor D. Shunt and compound motor 2. The generated e.m.f from 20-pole armature having 800 conductors driven at 30 rev/sec having flux per pole as 60 mWb, with 16 parallel paths is ___________ A. 1900 V B. 1840 …
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1. Swinburne’s test can be conducted on ___________ A. Series motor B. Shunt motor C. Compound motor D. Shunt and compound motor 2. The generated e.m.f from 20-pole armature having 800 conductors driven at 30 rev/sec having flux per pole as 60 mWb, with 16 parallel paths is ___________ A. 1900 V B. 1840 …
1. A 4 point starter is used to start and control the speed of a DC shunt motor with armature resistance control DC shunt motor with field weakening control DC series motor DC compound motor 2. Why starters are required in a DC motor? Back emf of these motors is zero initially These motors …
1. The function of interpoles in DC machine is to: Reduce field winding heating Reduce losses Compensate for airgap variation Improve commutation 2. The narrow poles placed in between the main poles of a DC machine are called ______ Intrapole Interpole Small Pole Large Pole 3. Direct current machines are attached with inter-poles …
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1. In DC generator on load, the air-gap flux distribution in space is Sinusoidal Triangular Pulsating Flat-topped 2. To speed up the commutation process ______ must be neutralized. Reactance Voltage Armature current Field Current Armature Reactance 3. In DC machine time of commutation decreases with: Increase in width of commutator segment Increase in …
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1. Ward-Leonard system of speed control is not recommended for _________ Constant speed operation Wide speed Frequent-motor reversed Very slow speed 2. In Ward Leonard speed control method for lowering the speed of the motor ______________ Reduce armature voltage Increase armature voltage Increase field current Decrease field current 3. Reducing the armature voltage …
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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