MCQOPTIONS
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MCQOPTIONS
This section includes 38 Mcqs, each offering curated multiple-choice questions to sharpen your Casting knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
According to Bernoulli’s theorem, energies at two points in a flowing liquid are equal. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
What is the shape of the sprue? |
| A. | Cuboidal |
| B. | Cubicle |
| C. | Trapezoidal |
| D. | Spherical |
| Answer» D. Spherical | |
| 3. |
The heat needed for a change of state of a material without changing the temperature is called what? |
| A. | Sensible heat |
| B. | Latent heat |
| C. | Calorific heat |
| D. | Specific heat |
| Answer» C. Calorific heat | |
| 4. |
For the transmission of heat from one body to another it is essential that: |
| A. | Both bodies are solids |
| B. | The two bodies are at different temperatures |
| C. | Both bodies are in contact |
| D. | At least one of the bodies has some source of heating |
| Answer» C. Both bodies are in contact | |
| 5. |
Materials with low resistivity do not find their applications in: |
| A. | heating element |
| B. | transformers |
| C. | house wiring |
| D. | transmission lines |
| Answer» B. transformers | |
| 6. |
A highly resistive material is chosen for heating element in order to |
| A. | Reduce the length of heating element |
| B. | Increase the life of heating element |
| C. | Reduce the effect of oxidation |
| D. | Produce large amount of current |
| Answer» B. Increase the life of heating element | |
| 7. |
In which of the following appliances is the heating effect used? |
| A. | Electric motor |
| B. | Transformer |
| C. | Electric furnace |
| D. | Generator |
| Answer» D. Generator | |
| 8. |
Choose the INCORRECT statement with respect to the core type induction furnace. |
| A. | It is suitable for intermittent service only. |
| B. | It suffers from pinching effect. |
| C. | It must be run on a low-frequency supply. |
| D. | The crucible for charge is of odd shape and is very inconvenient for tapping the molten charge. |
| Answer» B. It suffers from pinching effect. | |
| 9. |
Induction heating CANNOT be used for |
| A. | brazing |
| B. | wood gluing |
| C. | annealing of brass |
| D. | surface hardening of steel |
| Answer» C. annealing of brass | |
| 10. |
_____ comes under the category of high-frequency heating. |
| A. | Eddy current heating |
| B. | Arc heating |
| C. | Resistance heating |
| D. | Infrared heating |
| Answer» B. Arc heating | |
| 11. |
In dielectric heating, if the distance between electrodes is equal to half the wavelength at a given frequency then |
| A. | the material will be uniformly heated |
| B. | the material will not be uniformly heated |
| C. | maximum heat energy will be produced , |
| D. | both (D) both (A) and (C) are valid |
| Answer» C. maximum heat energy will be produced , | |
| 12. |
In direct resistance heating, the electric current passes through |
| A. | Charge |
| B. | Elements of low resistance |
| C. | Out of charge |
| D. | Elements of high resistance |
| Answer» B. Elements of low resistance | |
| 13. |
A heater operated from a 250 V, 50 Hz single phase supply consumes 2.5 kWh in one hour. If it is now connected to a square wave generator of 400 V peak to peak voltage and frequency 150 Hz the power dissipated by the heater will be: |
| A. | 1.6 kW |
| B. | 2.8 kW |
| C. | 3.2 kW |
| D. | 6.4 kW |
| Answer» B. 2.8 kW | |
| 14. |
Heat is mainly transferred by conduction, convection and radiation in |
| A. | Insulated pipes carrying hot water |
| B. | Refrigerator freezer coil |
| C. | Boiler furnaces |
| D. | Condensation of steam in a condenser |
| Answer» D. Condensation of steam in a condenser | |
| 15. |
Most of the fuses operate due to |
| A. | Heating effect of current |
| B. | Magnetic effect of current |
| C. | Electrostatic effect of current |
| D. | Induction effect of current |
| Answer» B. Magnetic effect of current | |
| 16. |
For the transmission of heat from one body to another. |
| A. | temperature of the two bodies must be different |
| B. | at least one of the bodies must have some source of heating |
| C. | both bodies must be in contact |
| D. | both bodies must be solids |
| Answer» B. at least one of the bodies must have some source of heating | |
| 17. |
In which of the following appliance does the heating effect of current appear as an undesirable side effect? |
| A. | Immersion heater |
| B. | Electric Iron |
| C. | Vacuum cleaner |
| D. | Electric oven |
| Answer» D. Electric oven | |
| 18. |
Dielectric heating is an industrial method employed for heating of: |
| A. | Solids |
| B. | Conducting materials |
| C. | Liquids |
| D. | Insulating materials |
| Answer» E. | |
| 19. |
Eureka is a commercial name of a heating element whose composition is: |
| A. | 70% iron, 25% chromium, 5% aluminium |
| B. | 55% copper and 45% nickel |
| C. | 80% nickel and 20% chromium |
| D. | 45% copper and 55% nickel |
| Answer» C. 80% nickel and 20% chromium | |
| 20. |
In electric arc furnaces, the heat produced by the electric arc produces approximately ______ temperature. |
| A. | 35° C |
| B. | 3500° C |
| C. | 10° C |
| D. | 100° C |
| Answer» C. 10° C | |
| 21. |
In an electric room heat convector, the method of heating used is: |
| A. | Arc heating |
| B. | Resistance heating |
| C. | Induction heating |
| D. | Infrared heating |
| Answer» C. Induction heating | |
| 22. |
A body reflecting entire radiations incidenting on it is called the: |
| A. | White body |
| B. | Gray body |
| C. | Black body |
| D. | Transparent body |
| Answer» B. Gray body | |
| 23. |
A perfect black body is one which: |
| A. | Absorbs all incident radiations |
| B. | Reflects all incident radiations |
| C. | Transmits all in incident radiations |
| D. | All of the above |
| Answer» B. Reflects all incident radiations | |
| 24. |
An Ajax-Wyatt furnace is which type of furnace? |
| A. | Vertical core type induction furnace |
| B. | Dielectric heating furnace |
| C. | Direct arc furnace |
| D. | Indirect arc furnace |
| Answer» B. Dielectric heating furnace | |
| 25. |
Hysteresis loss and eddy current loss are used in: |
| A. | Resistance heating |
| B. | Dielectric heating |
| C. | Induction heating of steel |
| D. | Induction heating of brass |
| Answer» D. Induction heating of brass | |
| 26. |
In induction heating, the depth up to which the current will penetrate is proportional to: |
| A. | 1/(Frequency)1/2 |
| B. | 1/Frequency |
| C. | Frequency |
| D. | (Frequency)2 |
| Answer» B. 1/Frequency | |
| 27. |
A section of insulation material is placed between two conducting plates to be heated by non-conductive heat. The system is supplied with a voltage of 1000 V, and delivers a capacitance of 9 pF with an electric power factor of 0.05. What will be the frequency (MHz) of the supply to produce the necessary thermal effect equivalent to a power loss of 900 W? |
| A. | 1000/π |
| B. | 2000/π |
| C. | 2000π |
| D. | 1000π |
| Answer» B. 2000/π | |
| 28. |
Dielectric heating is used for heating: |
| A. | furnaces |
| B. | zinc cells |
| C. | wood |
| D. | steel sheets |
| Answer» D. steel sheets | |
| 29. |
ACCORDING_TO_BERNOULLI‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬•S_THEOREM,_ENERGIES_AT_TWO_POINTS_IN_A_FLOWING_LIQUID_ARE_EQUAL.?$# |
| A. | True |
| B. | False |
| Answer» B. False | |
| 30. |
WHAT_IS_THE_SHAPE_OF_THE_SPRUE??$ |
| A. | Cuboidal |
| B. | Cubicle |
| C. | Trapezoidal |
| D. | Spherical |
| Answer» D. Spherical | |
| 31. |
In any flow through a system, if the area of cross section in which the metal is flowing, decreases, how will it affect the velocity? |
| A. | Increases |
| B. | Decreases |
| C. | No affect |
| D. | Quantities not related |
| Answer» B. Decreases | |
| 32. |
When the molten metal is put into the mold, what is that temperature called? |
| A. | Melting temperature |
| B. | Vapourising temperature |
| C. | Pouring temperature |
| D. | Room temperature |
| Answer» D. Room temperature | |
| 33. |
What is the unit of specific heat of solid metal? |
| A. | J/kg |
| B. | J °C/kg |
| C. | J/kg °C |
| D. | °C/kg |
| Answer» D. ¬¨¬®‚Äö√†√ªC/kg | |
| 34. |
If there is an increase in the mass of the metal being heated, how would it affect the total heat energy required to raise the temperature of metal? |
| A. | Increases |
| B. | Decreases |
| C. | No affect |
| D. | Quantities not related |
| Answer» B. Decreases | |
| 35. |
The heat needed for change of state of a material without changing the temperature is called what? |
| A. | Sensible heat |
| B. | Latent heat |
| C. | Calorific heat |
| D. | Specific heat |
| Answer» C. Calorific heat | |
| 36. |
Heat required to raise the temperature to the melting point is called what? |
| A. | Sensible heat |
| B. | Latent heat |
| C. | Calorific heat |
| D. | Specific heat |
| Answer» B. Latent heat | |
| 37. |
Which of the following is not a furnace used for heating? |
| A. | Cupola furnace |
| B. | Crucible furnace |
| C. | Electric arc furnace |
| D. | Blow air furnace |
| Answer» E. | |
| 38. |
For casting operation, a metal must be heated to what temperature? |
| A. | Above solidifying temperature |
| B. | Above vapourising temperature |
| C. | Above melting temperature |
| D. | Above room temperature |
| Answer» D. Above room temperature | |