A chock coil is a coil that posses: Low inductance and high resistance High inductance and negligible resistance Low inductance and low resistance High inductance and high resistance Correct answer: 2. High inductance and negligible resistance
The watt-hour meter is best defined as: Indication device Transfer device Integrating device Recording device Correct answer: 3. Integrating device
Certain transformer has full-load copper losses of 500 W. What is value of copper loss at half load: 62.5 W 125 W 250 W 750 W Correct answer: 2. 125 W Solution: Copper losses vary with the square of current. Copper loss at half load will be: (1/2)2 * 500 = 500/4 = 125 Watt
What is the full load primary current of a 3000/150 V, 30 kVA transformer: 2 A 5 A 10 A 20 A Correct answer: 10 A Solution: I = kVA/Primary voltage = 30 kVA/3000 = 30 * 1000 / 3000 = 10 A
The overall efficiency of a DC generator is maximum when its variable loss equals: Stray losses Iron losses Constant losses Mechanical losses Correct answer: 3. Constant losses
dht11 is _____________ sensor: Object presence sensor Humidity sensor Air sensor Position sensor Correct answer: 2. Humidity sensor The dht11 is a temperature and humidity sensor. dht11 is a basic, ultra low-cost sensor that uses a humidity sensor and a thermistor to measure temperature. dht11 is often combined with arduino for obtaining digital temperature and … Read more
A transducer converts: A signal in one form to another Voltage to current only AC to DC None of these Correct answer: 1. A signal in one form to another A transducer is a device that converts a signal in one form to another. Transducers are often classified into two major categories. Mechanical transducers: Transducers … Read more
Change in output of sensor with change in input is termed as: Accuracy Sensitivity Resolution Threshold Correct answer: 2. Sensitivity The Change in the output of the sensor with a change in input is known as sensitivity. The sensitivity of a sensor is also defined as the ratio between the output signal and measured property … Read more
Back to Back HVDC is practically used to achieve which of the below mentioned objectives: Interconnect two asynchronous AC systems Stabilization of AC systems For reducing short circuit currents All of these Correct answer: 4. All of these Back to Back HVDC is practically used for interconnecting two asynchronous AC systems. The essential feature of … Read more
