Electromotive force is measured by a __ .

All turned switches off before that have doing repair work on any electrical equipment, shall be __ ·_.

The power factor of a circuit is approximately 100 % if the circuit load consists only of

The internal resistance of a milliammeter should be very low in order to have

What is the approximate neutral current in a 4-wire system with phase A carrying 68 A, phase B carrying 88 A and phase C carrying 96 A?

What motor is best suited to drive small electric rans?

One foot of a certain size of nichrome wire has a resistance of 1.63 ohms. To make a heating element for a toaster that will use 5 A at 110 V, the number of feet of wire needed is approximately

The proper way of measuring an unknown voltage with a multi­tester is to

Temperature coefficient of a condu.ctor is defined as the

What important data can be

gathered by performing an open circuit test on transformers?

How many kilowatts is equal to 200 joules per second?

A junction transistor has three terminals namely:

Which of the following electric machine is equipped with slip rings?

The pointer or needle of an

indicating instrument is usually made from

A resistor when connected

across a 24-V battery draws a current of 1 mA. What is the required resistance?

A device used to remove the sharp burrs or rough edges is called

A dry cell has internal resistance of 0.02 ohm and a terminal

voltage of 1.5 V on open circuit. What will be its terminal voltage if a 0.1-ohm resistance is

connected across its terminals?

An instrument used to measure

the speed of a motor or a

generator.

The condition of Ohm's law is that

A dry cell has an internal

resistance of 0.02 ohm and open circuit voltage of 1.5 V. Calculate the power delivered to a resistor of 0.6-ohm resistance.

Each component in a motor

controller must be approved for which of the following?

A frequency of 60 Hz means that the cycle is repeated __ . ·

Power factor is defined as the ratio of

What is the total kVA rating of 230 V, three-phase circuit

supplied by a 20-A circuit

breaker?

The presence of current is only made known by the effect it' produces. Three important

effects are:

A toaster takes 10 A from a 120- volt line. The power used is

Grease is a lubricant that is

basically a combination· of __ .

Generally all ac electric motors operate on the principle of induction or

In making a resistance test, remember that the resistance of a short circuit is

For prevent from an electric shock, electrical ladders should have

Which of the following is the best advantage of a de motor over an ac motor?

Which of the following switches is the same as a three-way switch?

A synchronous motor when under-excited acts like

Which of the following statements describe a synchronous motor?

Which of the following motors produce lagging power factor?

Electrical symbol represented by a circle with a plus sign inside it.

To control a lamp from five different places,· an electrician would install the following:

39. A single-phase motor is taking 20 A from a 400 V supply at 0.75 lagging power factor. What is the power taken?

Calculate the current drawn by a

100- W, 110 V incandescent lamp?

What is in brief, the basis of operation of a 3-phase induction motor?

The device used to attenuate specific signals is the

A small tool With a tapered drill point used to make a pilot hole for wood screw mounting.

How much is-the resistance of a 600 W, 120-V toaster?

To protect battery terminals from corroding, they should be covered with · _ ,-

The· insulation resistance of the winding of an electric motor is measured by

A synchronous converter is used to change __ .

The direction of rotation a three phase motor can be reversed by

The least efficient lighting source is the

The rating of storage battery

that delivers 15 amps for 12

hours is

A short length of a conductor used to make a connection

between terminals or around a break in a circuit.

5.. The surface nonmetallic raceway may NOT be used in the

following locations EXCEPT one. Which one is this?

A fabricated assembly of

insulated conductors in a flexible metallic enclosure.

54. Fixture wires shall NOT be smaller than

Flat cable assemble shall NOT be installed ____

For bare metal parts, busbars, etc of opposite polarity held free in air shall maintain a minimum spacihg of __ for voltages rated not over 250 V.

For grounding electrode to which portable or mobile equipment

system neutral impedance is

connected, shall be isolated from· the ground by at least a certain distance from any other system or equipment grounding

electrode. What is this distance?

Type IGS cable is using a dry

kraft paper tape and an SF6 gas. What do you mean by SF6?

Cables operated at over ____ shall be shielded

Space heating cables shall be secured at intervals NOT exceeding ____

A run conduit between outlets, between fittings, between outlet and fitting shall not contain

more than the equivalent of __ quarter bends.

The average distance between down conductors in a lightning protection system shall NOT exceed

A storage battery supplying

emergency lighting an d power shall maintain no less than 87".5 % of full voltage at total load for a period of at least

A general term covering an assembly or assemblies of

devices for the interruption,

control and metering of electric power.

Thermoplastic insulated fixture wires shall be durably marked on the surface at intervals NOT exceeding

What is the temperature rating of THW insulation

The minimum size of type !GS cable shall be __ .

This is a single conductor or multH:onductor assembly

provided with or without an

overall covering, primarily used for services.

Ground connectors shall be made at approximately every other steel column around the perimeter of the building and shall NOT be' more than

apart.

Type AC cable shall NOT be permitted to be used

Transformers that contain liquid that will burn shall be installed only in approved vaults and shall also comply with the following conditions EXCEPT one. Which one is this?

An appliance which can easily be moved from one place to

another in normal use.

Flat cable assembles shall have conductors of ____ special stranded copper wires

What locations do NOT allow the installation of PVC rigid

conduits?

Incandescent lamp fixtures shall be marked to indicate the

allowable wattage of lamps. The markings shall be permanently installed in letters at least

high.

For school buildings, the general lighting load is __ ·_ VA per

square meters.

The feeder demand factor for

three kitchen equipment other than dwelling kitchen equipment shall be

No parts of cord connected

fixtures, hanging fixtures or

pendants shall be located within .a zone measured __

horizontally from a bathtub rim.·

To provide for small appliance load in a dwelling unit, the

feeder should be computed at

Which one is used on conduits and are located inside and

outside of the box.

The circuit conductors between the the service entrance equipment or isolated generating plant and the branch circuit overload

device or devices.

Open wiring on insulators shall be permitted only For wiring systems of __ or less

Which of the following metals is the best conductor of electricity

The nearest ground terminal shall be NOT less than __ from the foundation wall.

Conductors shall be securely attached to the buildings using fasteners. Fasteners shall be spaced NOT more than.

The minimum diameter of air

terminal used at the top· of a

heavy duty smoke or vent stacks shall be __ ., exclusive of the corrosion protection.

In damp or wet locations, boxes and fittings should be properly placed or insulated to prevent

Busbars shall be made from copper having a minimum conductivity of how many percent?

Individual open conductors and cables other than service

entrance cables shall NOT be installed within of every grade level.

Pipelines with impedance heating shall not operated at greater than

Watercrafts switchboards shall be provided with a clear working space of at least -___at the

front.

An insulated grounded conductor of 14 mm2 or smaller shall be

Identified by a continuous

outer finish along its entire­length.

Equipment having an open

circuit voltage exceeding __ shall NOT be installed in dwelling occupancies.

Concealed knob and tube wiring conductors shall be rigidly

supported on knobs not more

than a certain minimum distance apart. What is this distance?

The area with ___ from an aircraft power plant shall be classified hazardous under Class I, Division 2

location.

96. If the duty cycle of a motor­

generator arc welder is 100 % the supply conductors shall NO, be less than __ of its rated primary nameplate current .

For a motor starter to be in sight of the controlled motor, it must NOT be more than __ meters away.

Which of the following materials is used to support the conductor in the open wiring method?

Most wires used in residential house wiring are usually

insulated by which of the

following?

Conductors applying a heating unit shall be calculated at __ percent times the

heating. load plus the blower motor.