Quiz about Elec- CBT Review Part-1

Question 1

H in HVAC stands for

Accepted Answer

Heating

Answer

Hybrid

Answer

Hydrogen

Answer

Hospitals

Question 2

Natural ventilation uses

Accepted Answer

things like open windows or louvers.

Answer

blowers

Answer

Fans

Answer

All other answers

Question 3

Forced ventilation uses

Accepted Answer

All other answers

Answer

Fans

Answer

Blowers

Answer

Air Handler Unit (AHU)

Question 4

Air conditioned buildings will normally have

Accepted Answer

Sealed windows

Answer

Open doors

Answer

Ceiling fans

Answer

Glass windows

Question 5

Air conditioning has two basic classifications

Accepted Answer

Systems which provide comfort air in offices and air in process areas

Answer

Systems which provide comfort heating and cooling

Answer

Systems which provide hot water and cold water

Answer

All other answers

Question 6

Typical HVAC drawing types are

Accepted Answer

All other answers

Answer

Piping diagram

Answer

Detail drawing

Answer

Floor plans

Question 7

Portable equipment is an equipment that is

Accepted Answer

All other answers

Answer

Mobile

Answer

easily moved

Answer

designed and intended to be moved

Question 8

Heaters In a workshop, or manufacturing type area, where larger heating units are required, they may be supplied power from a

Accepted Answer

2 phase supply

Answer

Single phase supply

Answer

3 phase supply

Answer

Electrical store

Question 9

The elements in the infrared heater produce ____________which we feel as heat.

Accepted Answer

electromagnetic waves

Answer

Air

Answer

Magnetic field

Answer

All other answers

Question 10

To ensure portable equipment is safe for continued use, it is a requirement that portable electrical equipment is ___________on a regular basis.

Accepted Answer

tested and inspected

Answer

Washed

Answer

Used

Answer

All other answers

Question 11

Which type of motor winding provides constant current in the field and armature?

Accepted Answer

Shunt

Answer

Series

Answer

Compound

Answer

Cumulative compound

Question 12

What are DC motor Brushes made from?

Accepted Answer

Carbon

Answer

Steel

Answer

Iron

Answer

Copper

Question 13

What is the purpose of the commutator?

Accepted Answer

Delivers current to the armature

Answer

Delivers current to the stator

Answer

Regulates the motor running

Answer

Helps stop the motor

Question 14

What makes the rotor turn in a DC Motor?

Accepted Answer

Interaction between the magnetic fields

Answer

Loading of the motor

Answer

Increased supply frequency

Answer

Lowered supply current

Question 15

What is a key advantage of using DC motors?

Accepted Answer

It is easy to control motor speed

Answer

They can work on both AC and DC current

Answer

They require no brushes

Answer

A DC motor are more expensive AC Motor equivalents

Question 16

The simple design of DC motors makes service, maintenance and control well understood and easily supported. Speed control is simple: Just adjust___________ and you easily adjust the speed.

Accepted Answer

the terminal voltage

Answer

Permanent magnet

Answer

shaft rotation

Answer

size of motor

Question 17

Series-wound DC motors are used where _____________is required.

Accepted Answer

high starting torque

Answer

Low starting torque

Answer

Low starting speed

Answer

High  starting speed

Question 18

__________________________have the field winding connected in series with the rotor winding,

Accepted Answer

Series-wound DC motors

Answer

Shunt-wound DC motors

Answer

compound-wound DC motors

Answer

combination-wound DC motors

Question 19

The ________________is an industry workhorse for both high and low power.

Accepted Answer

Series-wound DC motors

Answer

Shunt-wound DC motors

Answer

Compound-wound DC motors

Answer

Combination-wound DC motors

Question 20

__________________are the most widely used as they have a linear characteristic of voltage and torque.

Accepted Answer

Shunt-wound DC motors

Answer

Series-wound DC motors

Answer

Compound-wound DC motors

Answer

Combination-wound DC motors

Question 21

Which type of DC motor would be used for traction equipment?

Accepted Answer

Compound Motor

Answer

Series Motor

Answer

Large Motor

Answer

Shunt wound

Question 22

The Shunt Wound Motor is used where the speed is:

Accepted Answer

Constant

Answer

Variable

Answer

Unreliable

Answer

Very fast

Question 23

What can cause the damage to a motor?

Accepted Answer

Water jets

Answer

Air cooling the motor

Answer

Regularly servicing the motor

Answer

Securely fixing the motor

Question 24

What is ambient temperature?

Accepted Answer

The temperature of the air surrounding us

Answer

The heat from an Oven

Answer

The temperature of the Sun

Answer

How hot the motor gets at full load

Question 25

__________________________ has more constant and controllable speed over various loads.

Accepted Answer

Shunt-wound DC motors

Answer

Series-wound DC motors

Answer

Compound-wound DC motors

Answer

Combination-wound DC motors

Question 26

_______________________ are virtually suitable for almost all applications like business machines, machine tools, agitators and mixers etc.

Accepted Answer

Compound-wound DC motors

Answer

Series-wound DC motors

Answer

Shunt-wound DC motors

Answer

Combination-wound DC motors

Question 27

_________________________ are used to drive loads such as shears, presses and reciprocating machines.

Accepted Answer

Compound-wound DC motors

Answer

Series-wound DC motors

Answer

Shunt-wound DC motors

Answer

Combination-wound DC motors

Question 28

The exposed un-insulated components of DC motors; _________________, brush rigging and bolted connections are vulnerable to early electrical failure when the motor is sited in an inadequate enclosure.

Accepted Answer

Commutator

Answer

Stator

Answer

Rotor

Answer

Frame

Question 29

Many______________, wet or dry, are excellent conductors. These include carbon, metal dust and acid salts.  Anything wet similarly conducts current quite well even at low voltages across distances of several inches.

Accepted Answer

Contaminants

Answer

Insulators

Answer

Semiconductors

Answer

Dust

Question 30

DC motors are de-rated by __________per 1000 feet above the 3300 feet.

Accepted Answer

0.03

Answer

0.05

Answer

0.08

Answer

0.1

Question 31

What feature defines a step-down transformer?

Accepted Answer

Less windings on the secondary side.

Answer

More windings on the primary side.

Answer

More windings on the secondary side.

Answer

The same number of windings on both.

Question 32

What term is used to define the rating of a transformer?

Accepted Answer

VA

Answer

LV

Answer

IR

Answer

HV

Question 33

Which type of transformer has a secondary voltage that does not exceed 1.1kV?

Accepted Answer

Distribution transformer

Answer

Transmission

Answer

Supply

Answer

Instrument

Question 34

Which type of transformer uses the supply wire as its primary winding?

Accepted Answer

CT

Answer

Transmission

Answer

SELV

Answer

Isolating

Question 35

Transformers are used in transmission and _____________systems to control and change voltages so that the electricity can be economically delivered to the customers.

Accepted Answer

Distribution

Answer

Reception

Answer

Electric

Answer

Control.

Question 36

__________________________ensure safety by limiting the voltage output and the current to a safe level.

Accepted Answer

Site safety transformers

Answer

Instrument transformer

Answer

step-down transformers

Answer

step-up transformers

Question 37

A common use for SELV transformers is to, Step the voltage down to a safe level and

Accepted Answer

Isolate the input from the output

Answer

Increase voltage

Answer

Decrease current

Answer

Make input and output same

Question 38

Voltage instrument transformers are operated as _________________.

Accepted Answer

step-down transformers

Answer

step-up transformers

Answer

Isolation transformers

Answer

Power transformer

Question 39

Current instrument transformers are operated as _________________.

Accepted Answer

step-up transformers

Answer

Isolation transformers

Answer

Power transformer

Answer

step-down transformers

Question 40

What type of UPS is also called double conversion UPS?

Accepted Answer

Online UPS

Answer

Offline UPS

Answer

Line interactive UPS

Answer

No UPS

Question 41

What is the name of the first signal a transponder receives called?

Accepted Answer

Interrogator

Answer

Intermittent

Answer

Induction

Answer

Impedance

Question 42

What is the main advantage of an active transponder?

Accepted Answer

Long signal range

Answer

Short signal range

Answer

High insulation resistance

Answer

Low fault impedance

Question 43

What is the main advantage of a passive transponder?

Accepted Answer

Relatively small size

Answer

Relatively large size

Answer

High current usage

Answer

Low voltage drop

Question 44

The Smart Grid allows for automatic __________ when equipment fails or outages occur?

Accepted Answer

Re-routing

Answer

Resistance reduction

Answer

Voltage clamping

Answer

Current limiting

Question 45

There are two basic types of transponders, Active transponders and _______________.

Accepted Answer

Passive transponders.

Answer

Inactive transponders

Answer

Fast transponders

Answer

Slow transponders

Question 46

A ______________is an electronic device used to wirelessly receive and transmit electrical signals.

Accepted Answer

Transponder

Answer

Transmitter

Answer

Receiver

Answer

Rectifier

Question 47

The name transponder comes from the words "transmitter" and _____________.

Accepted Answer

Responder

Answer

Transponder

Answer

Receiver

Answer

Rectifier

Question 48

The Smart Grid is based on technology that allows for two-way communication between the network operator and the ____________.

Accepted Answer

End user

Answer

House tenant

Answer

Network operator

Answer

Manufacturer

Question 49

Smart meters are a domestic form of transponder relaying individual user information in real-time back to the ______________.

Accepted Answer

Network operator

Answer

House tenant

Answer

End user

Answer

Manufacturer

Question 50

A common use for SELV transformers is to, Step the voltage down to a safe level and

Accepted Answer

Isolate the input from the output

Answer

Increase voltage

Answer

Decrease current

Answer

Make input and output same

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