Related Questions

A contractor employed 30 men to do a piece of work in 38 days. After 25 days , he employed 5 men more and the work was finished one day earlier. How many days he would have been behind, if he had not employed additional men?
A 1
B 114
C 134
D 112
By the use of which of the following, high frequency power supply for induction furnaces can be obtained?
A Coreless transformers
B Current transformers
C Motor-generator set
D Multiphase transformer
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A Slop speed operation
B High starting torque
C Low windage losses
D All of the above
A farmer employed 36 labor to dig a pond in 15days, but after 10 days of work he discovered that only 50% of the work was done. How many additional labors are to be employed for completing the job in time?
A 25
B 30
C 32
D 34
Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?
A Pyrometer
B Thermocouple
C Thermometer
D Thermistor
Direct arc furnaces have which of the following power factors?
A Unity
B Low, lagging
C Low, leading
D Any of the above
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
For intermittent work which of the following furnaces is suitable?
A Indirect arc furnace
B Core less furnace
C Either of the above
D None of the above
In which of the following furnaces, the gases are sucked through the stock bed from below?
A Soaking pit
B Sintering machine
C Beehive oven
D None of these
Which of the following furnaces will have maximum thermal efficiency?
A Soaking pits
B Walking beam reheating furnace
C Boiler furnace
D Rotary kilns

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