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117 questions · page 4 of 6. Answer in your head first, then check the solution.

📘 ESAS Mock Board Exam
TypeAll 117Problem solvingObjective 117
DifficultyAll 117Easy 117MediumHard
#61📘 EE Pocket Reviewer RojasEasy
In domestic cake baking oven, the temperature is controlled by which one?
ARheostat
BAutotransformer
CThermostat
DVarying the supply voltage
#62📘 EE Pocket Reviewer RojasEasy
For intermittent work applications which of the following furnace types is more suitable?
ACoreless furnace
BIndirect arc furnace
CEither A or
DNeither A nor
#63📘 EE Pocket Reviewer RojasEasy
What term is used to describe a body that reflects the entire radiation incident on it?
ABlack body
BWhite body
CTransparent body
DOpaque body
#64📘 EE Pocket Reviewer RojasEasy
For the transmission of heat from one body to the other which of the following is required?
ABoth bodies must be solids
BBoth bodies must be in contact
CAt least one of the two bodies must have a source of heating
DThe temperature of the two bodies must be different
#65📘 EE Pocket Reviewer RojasEasy
For a given line voltage, four heating coils will produce maximum heat when connected in which of the following circuit connections?
AAll in parallel
BAll in series
CWith two parallel pairs in series
DOne pair in parallel with the other two in series
#66📘 EE Pocket Reviewer RojasEasy
Induction heating takes place in which of the following?
AInsulating materials
BConducting materials which are magnetic
CConducting materials which are non-magnetic
DConducting materials which may or may not be magnetic
#67📘 EE Pocket Reviewer RojasEasy
Molten steel is being further heated by high frequency. Which heating methods is more suitable?
AInfrared heating
BResistance heating
CEddy current and hysteresis heating
DArc heating
#68📘 EE Pocket Reviewer RojasEasy
Which of the following heating methods has maximum power factor?
AArc heating
BResistance heating
CDielectric heating
DInduction heating
#69📘 EE Pocket Reviewer RojasEasy
The temperature of a resistance furnace can be controlled by changing which of the following?
AApplied voltage
BNumber of heating elements
CCircuit configuration
DAll of these
#70📘 EE Pocket Reviewer RojasEasy
The electrode used in direct arc furnace is using which of the following materials?
ATungsten
BGraphite
CSilver
DCopper
#71📘 EE Pocket Reviewer RojasEasy
Which of the following heating methods has a leading power factor?
AResistance heating
BArc heating
CDielectric heating
DInduction heating
#72📘 EE Pocket Reviewer RojasEasy
In the direct arc furnace heating method, which of the following has high value?
ACurrent
BVoltage
CPower factor
DAll of these
#73📘 EE Pocket Reviewer RojasEasy
Which of the following insulating materials is suitable for low temperature applications?
ADiatomaceous earth
BAsbestos paper
CCork
DPorcelain
#74📘 EE Pocket Reviewer RojasEasy
What is a perfect black body?
AIt transmits all incident radiations
BIt absorbs all incident radiations
CIt reflects all incident radiations
DIt absorbs, reflects and transmits all incident radiations
#75📘 EE Pocket Reviewer RojasEasy
In an electric press, what is the purpose of mica?
AIt is used as an insulator
BIt is used for dielectric heating
CIt is used for induction heating
DIt is used as a device for pf improvement
#76📘 EE Pocket Reviewer RojasEasy
Magnetic materials are heated with the help of which of the following?
AElectric arc
BRadiation
CHysteresis loss
DElectric current
#77📘 EE Pocket Reviewer RojasEasy
In the indirect resistance heating method, how is heat delivered to the charge?
ADirectly
BBy radiation
CBy convection
DBoth B and C
#78📘 EE Pocket Reviewer RojasEasy
Which of the following heating methods is based on the transformer principles?
AResistance heating
BInduction heating
CDielectric heating
DEddy-current heating
#79📘 EE Pocket Reviewer RojasEasy
Which one is true about the material of the heating element for a furnace?
AIt has lower melting point
BIt has higher temperature coefficient
CIt has higher specific resistance
DAll of these
#80📘 EE Pocket Reviewer RojasEasy
Which of the following induction furnace has the lowest power factor?
ACore type
BCoreless type
CIndirect core type
DVertical core type

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