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030/2020

From the following power plants which one has the least operating cost ?
A) Hydro-electric B) Solar
C) Thermal D) Nuclear

In DC shunt motor what is the relation between speed, flux and back EMF ?

A) ‏معلا @ )8 جج۷‎
©) (भः ഉ) Eb » oN

The maximum permissible voltage drop in a 240 V network is 30%. What is the
minimum acceptable voltage in any point of the network ?

A) 225.1 ४ 8) 232.8 V ௦) ۷ 0) 220V

Which one of the following three phase motor is not self-starting ?
A) Synchronous motor

B) Squirrel cage induction motor

C) Wound rotor motor

D) Double cage motor

The fuel used in nuclear generation power plants is
A) Methane B) Crude oil
C) Liquefied hydrogen D) Isotopes of uranium

Removing the load from a DC series motor while working, what will happen to its
speed ?

A) Will increase B) Will become zero

C) Will decrease D) Will remain constant

The width of a trench for laying a single cable should be a minimum of cm.
A) 3300 B) 32cm C) 30cm D) 35cm

The fractional slip (S) of an induction motor can be found by the formula

Ns —Nr Ns —Nr
A) S= B =
| Ns 8 Nr
Nr—Ns Nr
0 = 0) S=—
) 8 Nr ) Ns
The sun makes energy in its inner core by a process called
A) Nuclear fission B) Chemical reaction
C) Nuclear fusion D) Photoelectric effect