Practice Test: Question Set - 02
1. Heat is transferred simultaneously by condition, convection and radiation
- (A) Inside
boiler furnaces
- (B) During
melting of ice
- (C) Through the
surface of the insulted pipe carrying steam
- (D) From
refrigerator coils to freezer of a refrigerator
2. The temperature inside a furnace is usually measured by which of the following?
- (A) Optical
pyrometer
- (B) Mercury
thermometer
- (C) Alcohol
thermometer
- (D) Any
of the above
3. In induction heating __________ is abnormally high.
- (A) Phase angle
- (B) Frequency
- (C) Current
- (D) Voltage
4. For heating element high resistivity material is chosen to
- (A) Reduce the
length of heating element
- (B) Increase the
life of the heating element
- (C) Reduce
the effect of oxidation
- (D) Produce
large amount of heat
5. Which of the following methods is used to control temperature in resistance furnaces?
- (A) Variation
of resistance
- (B) Variation
of voltage
- (C) Periodical
switching on and off of the supply
- (D) All of the
above methods
6. Resistance variation method of temperature control is done by connecting resistance elements in
- (A) Series
- (B) Parallel
- (C) Series-parallel
connections
- (D) All of the
above ways
7. For radiant heating around 2250°C, the heating elements are made of
- (A) Copper alloy
- (B) Carbon
- (C) Tungsten
alloy
- (D) Stainless
steel alloy
8. Which of the following is an advantage of heating by electricity?
- (A) Quicker
operation
- (B) Higher
efficiency
- (C) Absence
of flue gases
- (D) All
of the above
9. Induction heating process is based on which of the following principles?
- (A) Thermal
ion release principle
- (B) Nucleate
heating principle
- (C) Resistance
heating principle
- (D) Electromagnetic
induction principle
10. In a resistance furnace the atmosphere is
- (A) Oxidizing
- (B) Deoxidizing
- (C) Reducing
- (D) Neutral
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