PEC Pre Board 2

Conventional flow assumes charges flow from

_________.

• Positive to positive

• Positive to negative

• Negative to negative

• Negative to positive

In a series RLC circuit

• The current leads VL by 90^1/2

• The current lags VL by 90^1/2

• Z = Jxl at resonance

• The current leads VL by 90^1/2

• None of the above

How shall busbars be mounted on a panelboard?

• Rigidly

• Horizontal to the floor

• Snug, but not tight

• Loose

Branch circuit shall be classified according to the

maximum permitted ________.

• All of these

• Voltage rating

• Ampere rating

• kW rating

What does a symbol consisting of a rectangle with

solid shading indicates?

• Fuse cut—out

• Lighting panel board

• Telephone exchange

• Safety switch

As the power factor of a circuit increased

__________.

• reactive power is decreased

• both active and reactive- power are increased

• active power is decreased

• reactive power is increased

Where must the overcurrent device be located in a

circuit?

• At the first fitting or connector the circuit

• On the line side of the electric meter

• At the last outlet on the circuit

• A point where the conductor receives its supply

One million volts can be expressed as __________.

• 1 millivolt

• 1 kilovolt

• 1 megavolt

• 1 microvolt

Tests on a 300 m length of single core mineral

insulated cable produced the following results:

Conductor resistance 2.4 ohms, insulation resistance

40 M-ohms. What are the anticipated conductor and

insulation resistance values of a 120 m length of

cable?

• 16 ohms, 16 M-ohms

• 16 ohms, 0.96 M-ohms

• 0.96 ohms, 16 M-ohms

• 0.96 ohms, 40 M-ohms

If a motor enclosure is designed to contain sparks

or flashes that could ignite surrounding vapors or

gases, then the enclosure is considered to be

__________.

• ventilated

• explosion proof

• explosion resistant

• fire-proof