1. DC generator Losses occur while converting ______ Electrical energy to Mechanical Energy Mechanical energy to Electrical Energy Electrical Energy to Heat Energy Heat Energy to Mechanical Energy 2. Which of the following could be lamina-proximately the thickness of laminations of a D. C. machine? 0.005 mm 0.05 mm 0.5 mm 5 mm …
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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. For connecting two generators in parallel, they should have _________ Same current rating Same ohmic rating Same voltage rating All ratings must be same 2. Two DC shunt generator is connected in parallel to deliver a load current of 240 A. The ratings of both the generators are being given as 80 kW, …
1. Which of the following characteristics reveal about the magnetization nature of the DC Generator? No-load characteristics Load characteristics Armature characteristics Both no-load and load characteristics 2. To determine the relation between different quantities of a DC generator the Important Characteristics of DC generator are No-Load Characteristics External Characteristics Internal Characteristics All of the …
1. Which of the following characteristics reveal about the magnetization nature of the DC Generator? No-load characteristics Load characteristics Armature characteristics Both no-load and load characteristics 2. To determine the relation between different quantities of a DC generator the Important Characteristics of DC generator are No-Load Characteristics External Characteristics Internal Characteristics All of the …
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1. The emf equation of DC generator is E Øp/nza Øp60/nza Øpa/60nz Øpnz/60a 2. A 220 V separately excited dc motor takes 20 A and the armature resistance is 1.0 Ω. If the armature constant KaΦ = 1.5 rad/sec, the speed of the motor is 1000 rpm 2000/π rpm 3000/π rpm 4000/π rpm …
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. The emf equation of DC generator is E Øp/nza Øp60/nza Øpa/60nz Øpnz/60a 2. A 220 V separately excited dc motor takes 20 A and the armature resistance is 1.0 Ω. If the armature constant KaΦ = 1.5 rad/sec, the speed of the motor is 1000 rpm 2000/π rpm 3000/π rpm 4000/π rpm …
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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. The PWM control of DC motor varies _________ Linearly with speed Inversely with speed Parabolically with speed Exponentially with speed 2. In which of the following method, the effect of armature reaction is more? Field weakening method Armature resistance control Same in both methods Cannot be determined 3. Ward-Leonard system of speed …
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