Electrical Engineering MCQ Questions on Power System. Power System Multiple choice questions part 11 PSP Part 11, MCQ#1 Statement: Certain power system has phase to ground capacitance and inductance values 5 µF and 10 H respectively. If a magnetising current of 50 A is to be interrupted what is the value of voltage appearing across … Read more
The location of Lightning arrester is near: Transformer Generator Bus-bar Circuit breaker Correct answer: 1. Transformer Lightning arrester is located near a transformer.
For same kVA rating the induction motor’s leakage flux as compared to a transformer is: Less More Identical Correct answer: 2. More For same kVA rating the induction motor’s leakage flux as compared to a transformer is more. The reason is that in an induction motor there is an air gap present and the rotor … Read more
Iron loss in 3 phase induction motor mainly occurs in which part: Rotor core and rotor teeth Stator core and stator teeth Stator winding Stator and rotor Correct answer: 2. Stator core and stator teeth Iron loss in 3 phase induction motor mainly occurs in which part stator core and stator teeth
To produce an EMF at give frequency, the alternator will run at greatest speed for which number of poles To produce an EMF at give frequency, the alternator will run at greatest speed for which number of poles: 2 8 12 16 Correct answer: 1. 2 Explanation: From formula Speed = 120*f/P Indicates that the … Read more
A 220/1100 V transformer takes no load current of 5 A and absorbs 200 W. What is no load power factor: 0.074 lag 0.181 lag 0.256 lag 0.384 lag Correct answer: 2. 0.181 lag Solution: No load PF (Cosφ) = Wo/(V1.Io) = 200/(220*5) = 0.181 lag
The knowledge of the Diversity Factor helps in computing which of the given factors: Average load Total units Generated in a day Peak load Plant capacity Correct answer: 4. Plant capacity The knowledge of the Diversity Factor helps in computing plant capacity
The shunt admittance of a transmission line is given by 5 µS. In complex notation it will be expressed as: 5 * 10-6 S 5 * 10-6 ∠ 0° S 5 * 10-6 ∠ 90° S 5 * 10-6 ∠ -90° S Correct answer: 3. 5 * 10-6 ∠ 90° S 5 µS = 5 … Read more
A synchronous motor is operating with normal excitation. If load is increased the armature current drawn from supply mains also increases. Which of the below mentioned reasons is actually responsible for that: Increase in resultant armature voltage Increase in back EMF Increase in Power Factor All of above Correct answer: 1. Increase in resultant armature … Read more
Rating of Fuse is Expressed in which unit: Volts Amperes Volt-amperes Ampere-hours Correct answer: 2. Amperes Explanation: The fuse is a short piece of metal that is inserted in thecircuit for protection purposes. It melts when excessive current flowsthrough it thus breaking the circuit. The fuse element always connects in series to the circuit whose … Read more