A. d.c. only
B. a.c. only
C. partly a.c. and partly d.c.
Correct Answer: partly a.c. and partly d.c. ✔
Last Updated: December 17, 2018
Related MCQs
- In which of the following appUcations, direct current is absolutely essential ?
- In a mercury arc rectifier positive ions are attracted towards__________?
- In which of the following equipment direct current is needed ?
- Which of the following AC. motors is usually used in large motor-generator sets?
- In a rotary converter I2R losses as compared to a D.C. generator of the same size will be__________?
- The potential drop in the arc, in a mercury arc rectifier, varies__________?
- Mercury, in arc rectifiers, is chosen for cathode because__________?
- Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of __________?
- The cathdde voltage drop, in a mercury arc rectifier, is due to__________?
- To produce cathode spot in a mercury arc rectifier__________?
- The advantage of mercury arc rectifier is that__________?
- The internal efficiency of a mercury arc rectifier depends on__________?
- In a mercury pool rectifier, the voltage drop across its electrodes__________?
- If cathode and anode connections in a mercury arc rectifier are inter changed__________?
- The voltage drop at anode, in a mercury arc rectifier is due to__________?
- The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following__________?
- The ionization potential of mercury is approximately__________?
- In a glass bulb mercury arc rectifier the maximum current rating is restricted to__________?
- In a mercury arc rectifier characteristic blue luminosity is due to__________?
- When a rectifier is loaded which of the following voltage drops take place ?
- Which of the following mercury arc rectifier will deliver least undulating current?
- In a three-phase mercury arc rectifiers each anode conducts for__________?
- In a mercury arc rectifier________ flow from anode to cathode
- A mercury arc rectifier possesses __________ regulation characteristics
- In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.
- On which of the following factors the number of phases for which a rectifier should be designed depend ?
- It is the_________of the transformer on which the magnitude of angle of overlap depends?
- In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of__________?
- In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as__________?
- Which of the following statement is incorrect ?
- In phase-shift control method the control is carried out by varying the of grid voltage
- The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
- Copper oxide rectifier is usually designed not to operate above__________?
- Ageing of a selenium rectifier may change the output voltage by__________?
- The efficiency of the copper oxide rectifier seldom exceeds__________?
- Selenium rectifier can be operated at temperatures as high as__________?
- The applications of selenium rectifiers are usually limited to potential of__________?
- In selenium rectifiers efficiencies ranging from ___ to _______ percent are attainable?
- A commutating rectifier consists of commutator driven by__________?
- In a mercury arc rectifier, the anode is usually made of__________?
- Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?
- Which of the following is the loss within the mercury arc rectifier chamber ?
- Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?
- The efficiency of an electrolytic rectifier is nearly__________?
- The ignited or auxiliary anode in mercury arc rectifier is made of__________?