The inlet to an exhaust system shall be located in the area of heaviest concentration of contaminants:

A True

explanation

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For battery storage rooms continuous ventilation shall be provided at a rate of not less than ____ cubic foot per minute per square foot

Manual dampers shall be installed in connectors except in chimney connectors serving solid fuel-burning appliances:

False

The following lamp holder is approved to be installed in either a damp or wet location?

One listed for use in wet location

An 120 voltage source is supplying a lamp with a resistance of 172 ohms. what is the current flow in the circuit?

0.7 amperes

Current Flow = 120/172 = 0.7 amperes

What is the delay time permitted to start emergency generators in-case of normal power supply failure?

15 minutes

A solidly grounded system is the system grounded with high value of resistor or impedance.

False

Refer : NEC 100 [Definitions]
Solidly grounded system means direclty connected to ground with out any resistance or impedance.

All 15,20 amperes receptacle outlets installed in bathrooms of dwelling units shall always require _______

Ground fault circuit interceptor

A GFCI protector is required to install with all 15,20 amperes receptacles installed in bathrooms.

When branch circuits used at outside, the size of overhead conductors for 600 volts or less, for spans upto 50 feet, shall not be less than _______ copper.

NO 10

Refer : Section : 225.6(A)(1)
For Copper it is NO.10
for aluminum it is NO 8

A quick recovery Electric heater is rated at 4500 W and operated at 120 V, What will be the rating of circuit breaker to be used to protect it?

60 amperes

The ampere current drawn by electric heater = power / supply voltage = 4500/120 = 37.5 amperes
The circuit breaker rating should be 150% full load current
150% x 37.5 = 56.5 amperes. The nearest one is 60 amperes.

A 440 volts motor has a full load current of 34 amperes. what size disconnecting means is required?

40 amperes

Refer: Section 440.12(A)(1)
The rating of disconnecting means is 115% of full load current.
34 x 1.15 = 39.1 amperes.
The nearer rating is 40 amperes.

A 2 ft branch conductor with a resistance of 2.5 ohms is supplied with 120 V power supply. If 3 amperes current flows in the conductor then what is voltage drop across the conductor?

7.5 volts

Voltage drop = current flow in amperes x Resistance of the conductor = 3 x 2.5 = 7.5 Volts.

Working space in rooms allocated for electrical equipment shall not be used for _______

Storage of equipment

The vent vertical termination for mechanical draft system shall be located at least horizontally _____ from any portion of the roof structure:

3 feet

Flexible cards may not be used in the following locations _______

To replace a fixed wiring of a structure

Vents shall terminate not less than ______ in vertical height above the highest connected appliance flue collar:

5 feet