Deepakkumar Yadav
Energy Efficient Motors Specialty & Its Constructional Improvement As stated earlier, the energy efficient motor is that motor which operates giving efficiencies (2 to 4 % more than other standard motors), operates at reasonably good power factor and loss of power is lesser. These are manufactured with the change in design of slot shapes. Specialty of Motor … Read more
Positive Features of Energy Efficient Motor Q. State the significant features of energy efficient motor. Features are : Starting and running torque is more. Noise and vibrations are very very less. Material used for its construction is of high quality having higher flux densities and current density. Maintenance required is very less. Power factor is … Read more
Intelligent Power Factor Controller (IPFC) Effects of Low Power Factor For same kW demand of load, at low power factor current flowing through armature winding of alternator or windings of transformer increases, hence kVA rating required increases. As current supplied is increases for obtaining proper voltage regulation, conductor size of transmission lines etc. increases. The … Read more
Special Tests of 3 Phase Induction Motor Q. Explain the special tests of 3 phase induction motor. Open Circuit Voltage Ratio Test : The test is carried out to find out the voltage ratio or turns ratio. As shown in figure A the rotor resister starter is disconnected from the springs and voltmeter is connected … Read more
Energy Conservation Opportunities in Transformer Q. Energy Conservation Opportunities in Transformer. Opportunities are : Use amorphous core containing ferromagnetic elements like Iron, Cobalt alloy of high resistivity than silicon steel. So low core losses. Use encapsulated dry type transformer. Use autowound (saving in copper) or tapped transformer. Use energy efficient transformer. Use low resistant better … Read more
MCQ’s on Basic Electricals Question 1 The terminals across the source are ………… if a current source is to be neglected. (a) open-circuited (b) short-circuited (c) replaced by a capacitor (d) replaced by a source resistance Correct Answer is (a) open-circuited Question 2 An active element in a circuit is (a) Current … Read more
Electrical MCQ’s questions & answer Questions 51 to 57 Questions 41 to 50 Questions 31 to 40 Questions 21 to 30 Questions 11 to 20 Questions 01 to 10
Circuit Diagram for Performing Load Test on 415 V, 3 Phase, 4.8A, 3HP, Delta Connected sq. Cage Induction Motor Q. Draw a neat circuit diagram for performing load test on 415 V, 3Φ, 4.8A, 3HP, Delta connected sq. cage induction motor. Specify the meter ratings.
Causes of Motor Suffers from Heavy Vibrations and Excessive Noise when Operating Q. What are the probable causes, if the motor suffers from heavy vibrations and excessive noise when operating ? The induction motor’s performance is affected by the harmonics in the time variations of the impressed voltage. Air-gap flux harmonics are produced due to … Read more
Causes of Failure of Underground Cables Q. What are the causes of failure of underground cables ? 1. Mechanical Failure : The various Layers like sheath, conductor, Insulation a be injured. Due to injuries the cable may fail to work. Causes may be due to (A) Accidents (B) Carelessness … Read more