DMRC Electrical Engineering Paper-1 2016

Consider the following statements:
Over head transmission lines are provided with earth wires:
1. To protect the transmission line from direct lightning strike
2. To protect the transmission line insulation from the indirect lightning strike
3. To balance the line currents
4. To provide path for neutral current
Which of these statement/s is/are correct?

An ammeter has a current range of 0-5 A, and its internal resistance is 0.2Ω. In order to change the range to 0-25 A, what should be the value of resistance added and how it would connect with meter (i.e. series/parallel)?

Power consumed by a balanced 3-phase, 3 - wire load is measured by two wattmeter method. The first wattmeter reads twice that of the second. Then what will be the load impedance angle in radian?

The X/R ratio for distribution lines is:

Corona loss is minimum in:

The potential transformers’ Nominal Ratio is defined as the ratio of:

Whenever a 3-phase fault takes place at the terminals of an induction generator, the sustained fault current is:

For complete protection of a 3- phase line:

When two transformer of different kVA rating are connected in parallel they share the load in proportion to their respective kVA rating only when their:

The most efficient torque - producing actuating structure for induction - type relay is: