Power Engineering MCQ: Power Engineering Chapter 142

Power Engineering Chapter 142

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During shutdown, oil heater pilots and main burners are checked for

a) setting
b) temperature
c) pressure
d) cleanliness
e) flame pattern

Answer: D

It is important to drain an hot oil heater prior to attempting a radiographic inspection, because

a) oil and coke appear similar on the x-ray picture
b) oil and coke give a similar sound when the tube is hammered
c) x-rays passing through the oil might cause an explosion
d) drained tubes are cleaner for the radiologist to work with
e) it is safer

Answer: A

Coke deposits on the inner walls of a heater tube produce __________ when the tube is tapped lightly with a hammer?

a) a clear ringing tone
b) a dull sound
c) chimes
d) a vibrating sound
e) a whistling sound

Answer: B

In order not to be harmful to the metals used in hot oil systems the thermal fluid must

a) be kept at a low temperature
b) have a neutral pH value
c) be noncorrosive
d) be diluted with glycol
e) be mixed with kerosene

Answer: C

Vapour bubbles in a pump can cause the pump to

a) deteriorate
b) rotate
c) stall
d) decoy
e) cavitate

Answer: E

Hot oil high temperature (TSDH1) shutdown switches are installed on

a) the fuel gas line
b) the inlet line of the oil heater
c) the suction line of the pump
d) the surge tank suction line
e) the outlet line of the heater

Answer: E

The safety valve discharge on a hot oil system returns to

a) the pump suction
b) the surge tank
c) a unit user
d) the process system
e) the pump casing

Answer: B

How far from a furnace heater dike is the drain pit located?

a) about 75 meters
b) about 100 meters
c) about 25 meters
d) about 40 meters
e) about 50 meters

Answer: E

Temperature rise in a hot oil system during the period that the refractory is drying out is allowed at a rate of

a) not more than 55 degrees Celsius per hour
b) not more than 65 degrees Celsius per hour
c) not more than 45 degrees Celsius per hour
d) not more than 75 degrees Celsius per hour
e) not more than 100 degrees Celsius per hour

Answer: A

Small diameter pipe used in building hot oil systems is

a) 25.4 mm or smaller
b) 34.5 mm or smaller
c) 45.2 mm or smaller
d) 52.4 mm or smaller
e) 80 mm or smaller

Answer: A

To avoid start-up difficulties in cold weather a thermal fluid must have

a) a low pour point
b) antifreeze added to it
c) methanol injected into it periodically
d) a dehydration system installed in the surge tank
e) a low fire point

Answer: A

A hot oil pump suction is located

a) above the surge tank
b) level with the surge tank
c) inside the surge tank
d) below the surge tank level
e) at the side of the tank

Answer: D

A non-metallic part of a mechanical seal might be made from

a) asbestos
b) teflon
c) fibreglass
d) rubber
e) carbon

Answer: B

The approximate efficiency of a hot oil radiant heater is

a) 25 - 35%
b) 50 - 60%
c) 30 - 40%
d) 40 - 50%
e) 45 - 65%

Answer: D

The most important piece of equipment of a hot oil system is

a) the heater
b) the pump
c) the surge tank
d) the UV
e) the burner

Answer: A

The gas burners of a horizontal rectangular direct-fired oil heaters, are located

a) on the floor of the furnace
b) in the ceiling of the furnace
c) in the front of the furnace
d) in the corners of the furnace
e) external to the furnace

Answer: A

The convection tubes of a typical up-draft model fired heater are located in the

a) firebox
b) stack
c) radiant zone
d) breaching
e) refractory lining

Answer: D

The most typical fired heater model is the

a) down-draft
b) dual-draft
c) up-draft
d) balanced-draft
e) induced-draft

Answer: C

The most commonly applied oil heater, is the combination convection and __________ type heater because of its efficiency.

a) superheater
b) conduction
c) radiant
d) stationary
e) portable

Answer: C

The __________ type tubes have fins on their outer surfaces.

a) looped
b) extended
c) firetube
d) flared
e) tangential

Answer: B