Blue Dart Express Interview Questions and Answers

Calibration is the process of comparing measurements of an instrument or device to a known standard to ensure accuracy.

• Calibration is essential to maintain the accuracy and reliability of instruments and devices.

• There are different types of calibration such as electrical, mechanical, temperature, pressure, and flow calibration.

• Examples include calibrating a thermometer to ensure accurate temperature readings or calibrating a pressure gauge to ensure accurate pressure measurem...read more

Connecting a 3 phase motor to 1 phase can cause motor damage and inefficient operation.

• Connecting a 3 phase motor to 1 phase can lead to overheating and reduced torque.

• The motor may not start or run at a slower speed than intended.

• The motor windings may get damaged due to unbalanced currents.

• Using a phase converter or rewiring the motor can be potential solutions.

DC motors produce back EMF through the interaction of the magnetic field and the rotating armature.

• Back EMF is generated when the armature of a DC motor rotates within a magnetic field.

• The back EMF opposes the applied voltage and is proportional to the speed of the motor.

• Back EMF is important for motor control and can be used to estimate motor speed.

• Ammeters measure the current flowing through a circuit.

• They are connected in series and have a low resistance to minimize voltag...read more

Calibration is the process of adjusting and verifying the accuracy of measuring instruments or equipment.

• Calibration ensures that the measurements taken by an instrument are accurate and reliable.

• It involves comparing the readings of the instrument to a known standard or reference.

• Adjustments are made to the instrument until the readings match the standard.

• Examples of instruments that require calibration include thermometers, pressure gauges, and scales.

• Calibration is importa...read more

The supply voltage of houses typically ranges from 110 to 240 volts depending on the country and region.

• Supply voltage can vary based on the country's electrical standards.

• In the United States, the standard supply voltage is 120 volts.

• In Europe, the standard supply voltage is 230 volts.

• Some countries may have supply voltages as high as 240 volts.

• Supply voltage is important for determining the compatibility of electrical devices.