Technical Subject1-25

Question 0

In resistance color coding, red color is assigned to what value?

Answer 0

2

Question 1

Which of the following is a unit of electrical pressure?

Answer 1

Volt

Question 2

What is another name for a secondary cell

Answer 2

Storage cell

Question 3

How is a voltmeter connected in a circuit ?

Answer 3

Connect in a shunt across the load

Question 4

In the American wire gauge, as the number of gauge wire increases, the wire diameter_____.

Answer 4

Decreases

Question 5

A generator May lost residual magnetism because of ______.

Answer 5

Heating

Question 6

A meter whose needle is initially at the center.

Answer 6

Galvanometer

Question 7

A universal motor can be operated on which of the following supply currents?

Answer 7

AC or DC currents

Question 8

A 6-volt lead acid battery has an internal resistance of 0.01 ohm. How much current will flow if the battery has a short circuit ?

Answer 8

600A

Question 9

Automatic device that operates at preset values is known as _____.

Answer 9

Relay

Question 10

What is another name for full voltage starting ?

Answer 10

Direct on line

Question 11

What is the resistance reading of a shorted capacitor ?

Answer 11

Zero resistance

Question 12

A wire has a diameter of 0.125 inch. What is its cross sectional area in circular mild?

Answer 12

15625

Question 13

In metric standard, what is the unit of conductor sizes ?

Answer 13

mm sq.

Question 14

Multimeters consist of a _______.

Answer 14

Voltmeter, current meter and an ohmmeter.

Question 15

What component of an atom that doesn’t have any electrical charge ?

Answer 15

Neutron

Question 16

Excitation current is used is used in which of the following motors?

Answer 16

Synchronous motors

Question 17

A simple ohmmeter consists of a meter movement in series with,

Answer 17

A battery

Question 18

What is the former name of the American wire gauge ?

Answer 18

Brown and sharpe

Question 19

What resistance must be connected across a 4 - ohm resistance in order to give an equivalent resistance of 3 ohms?

Answer 19

12 ohms

Question 20

When using ohms law E divided by I would solve for _______.

Answer 20

Resistance

Question 21

Modern contact surfaces are made from what alloys?

Answer 21

Silver

Question 22

On a simple ohmmeter, the zero ohm mark is _____ of the scale.

Answer 22

Far right

Question 23

Two resistances of 8 and 10 ohms respectively are connected in parallel and take a total current of 9 A. What is the current flowing in the 8-ohm resistance ?

Answer 23

5A

Question 24

How do you call a diagram showing the physical location of the components such as coils, contacts, motors and the like in their actual positions?

Answer 24

Wiring diagram

Question 25

An electric iron takes 3.5 A. If the heating element has a resistance of 40 ohms, what is its power consumption?

Answer 25

0.49 kW

Question 26

What is the purpose of constructing a lead acid cell into a multiple plate cell ?

Answer 26

To increase the capacity of the cell.

Question 27

The continuity of a winding coil may be determined by measuring the resistance of the coil. If the winding is_____.

Answer 27

Open

Question 28

An instrument used to measure the state of electrical charge in a storage battery

Answer 28

Hydrometer

Question 29

Determine the reactance of a 50 micro farad capacitor. At 60 Hz.

Answer 29

53.06

Question 30

In a large alternator, which of the following is normally negligible?

Answer 30

Resistance of the winding