MCQOPTIONS
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MCQOPTIONS
This section includes 1177 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Current in dielectric heating? |
| A. | flow through the dielectric |
| B. | The ionic discharge between the dielectric medium and the metallic conductor flows through |
| C. | flows through a metallic conductor |
| D. | air flows through |
| Answer» B. The ionic discharge between the dielectric medium and the metallic conductor flows through | |
| 202. |
If a fan on a table runs slowly and gets hot, then the fault is that? |
| A. | Some part of the running-winding is short circuited |
| B. | field coil is open-circuit |
| C. | rotor-coil is open-circuit |
| D. | Regulator is short-circuited |
| Answer» B. field coil is open-circuit | |
| 203. |
If the anode and cathode are interchanged in a mercury arc rectifier, then? |
| A. | voltage drop will decrease |
| B. | rectifier won't work |
| C. | rectifier efficiency goes up |
| D. | the power of the rectifier will decrease |
| Answer» C. rectifier efficiency goes up | |
| 204. |
H on the negative conductor of the pole |
| A. | steady (stay |
| B. | pin type insulator |
| C. | pole insulator |
| D. | shackle |
| Answer» C. pole insulator | |
| 205. |
Red colored border and red colored crossbar are made in which type of security sign? |
| A. | prohibitive |
| B. | alert |
| C. | informative |
| D. | Affirmative |
| Answer» B. alert | |
| 206. |
How can the efficiency of the string be increased? |
| A. | by static shielding |
| B. | grade of holding |
| C. | increase the length of the cross arm |
| D. | suitable all |
| Answer» E. | |
| 207. |
What is the main cause of glare? |
| A. | excessive light in the visual range |
| B. | excessive brightness |
| C. | any of the suitable |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 208. |
What is the purpose of applying a layer of varnish on the vestments? |
| A. | electroplating |
| B. | vibrate accessories |
| C. | insulating clothing |
| D. | suitable all |
| Answer» E. | |
| 209. |
If a three inductance is started on a 2-phase supply, then |
| A. | fuses can burn |
| B. | it will go with jerks |
| C. | its speed will be less |
| D. | motor may burn |
| Answer» E. | |
| 210. |
A 4 pole alternator is rotated at 1500RPM then the output generated |
| A. | 10 milliseconds |
| B. | 40 milliseconds |
| C. | 20 milliseconds |
| D. | 50 milliseconds |
| Answer» D. 50 milliseconds | |
| 211. |
In air blast, pressurized air is used for what? |
| A. | close contact |
| B. | contact opening |
| C. | cooling the circuit breaker |
| D. | protection from arc |
| Answer» E. | |
| 212. |
The speed at which a rotating magnetic field rotates is called? |
| A. | motor slip |
| B. | rotor speed |
| C. | synchronous speed of motor |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 213. |
What is the excitation voltage given to the rotor in a synchronous motor? |
| A. | square wave AC |
| B. | half wave dc Voltage |
| C. | A.C. |
| D. | pure dc. |
| Answer» E. | |
| 214. |
Which motor is suitable for portable hand drill machine? |
| A. | split motor |
| B. | DC. shunt motor |
| C. | universal motor |
| D. | shaded pole motor |
| Answer» C. universal motor | |
| 215. |
If one of the 3 phases of a synchronous motor is short circuited, then the motor? |
| A. | will overheat |
| B. | will start |
| C. | won't start |
| D. | will not be in kinchronism |
| Answer» D. will not be in kinchronism | |
| 216. |
What is the nature of zero current in a transformer? |
| A. | is counterproductive |
| B. | is net reactive |
| C. | is pure resistant |
| D. | Has to be ahead of the primary voltage |
| Answer» B. is net reactive | |
| 217. |
In two wattmeter method the reading of one wattmeter will be zero if |
| A. | The load is only balanced |
| B. | be the power multiplier unit |
| C. | power factor is 0.5 |
| D. | weight is zero in one phase |
| Answer» D. weight is zero in one phase | |
| 218. |
Above normal speed can be achieved along the series field in the series motor; Because ? |
| A. | flux goes down |
| B. | line current decreases |
| C. | armature current decreases |
| D. | none of the suitable |
| Answer» B. line current decreases | |
| 219. |
What is a synchronoscope motor? |
| A. | Singer layer binding only in stator |
| B. | Both stator and rotor are wound |
| C. | Both |
| D. | none of the suitable |
| Answer» C. Both | |
| 220. |
The force between two long and parallel current carrying conductors is inversely proportional? |
| A. | of distance between current carrying drivers |
| B. | The product of the currents of both the current carrying conductors |
| C. | of current carrying conductor |
| D. | none of the above |
| Answer» D. none of the above | |
| 221. |
Using Lamination? |
| A. | Vortex current losses are reduced |
| B. | vortex currents become more |
| C. | load current goes down |
| D. | Friction losses are reduced |
| Answer» B. vortex currents become more | |
| 222. |
The electrolyte in mercury cells is made up of? |
| A. | zinc oxide |
| B. | Potassium hydroxide and copper oxide |
| C. | Potassium hydroxide and zinc oxide |
| D. | suitable all |
| Answer» D. suitable all | |
| 223. |
Capacitor is used in single phase motor? |
| A. | A series of early bindings |
| B. | Parallel to the initial binding |
| C. | BOTH A AND B |
| D. | none of the above |
| Answer» D. none of the above | |
| 224. |
What is the life span of lead acid battery? |
| A. | over a year |
| B. | six months old |
| C. | two to five months |
| D. | one to six months |
| Answer» D. one to six months | |
| 225. |
What is the function of Interpol? |
| A. | convert armature current to dc |
| B. | reduce sparking on the computer |
| C. | reduce counter emf |
| D. | increase motor speed |
| Answer» C. reduce counter emf | |
| 226. |
A ferromagnetic core is magnetized and demagnetised. In this, the hysteresis loss will occur only when the cycle is |
| A. | alternating |
| B. | be pulsating |
| C. | to be circumnavigating |
| D. | having any of the appropriate |
| Answer» E. | |
| 227. |
The positive plate of a lead acid cell is made up of? |
| A. | land dumped |
| B. | lead peroxide |
| C. | Spongy Lad's |
| D. | suitable all |
| Answer» C. Spongy Lad's | |
| 228. |
The tube seems to be inside the starter? |
| A. | electrolytic capacitors |
| B. | gang capacitor |
| C. | mica capacitor |
| D. | PF capacitor |
| Answer» E. | |
| 229. |
The wire of a 3 digit milli voltage resistor is used to measure the MV drop. Text starts flashing. What is the reason for flashing of display on milli voltmeter? |
| A. | display damaged |
| B. | There is no battery in the measuring instrument |
| C. | The battery in the measuring instrument is weak |
| D. | The range of the measured value is greater |
| Answer» E. | |
| 230. |
The precision of heating depends on the range of equipment selected. What is Ohm's law for selecting an instrument's range? What should be the measured value? |
| A. | mid scale |
| B. | below middle scale |
| C. | above middle scale |
| D. | full scale |
| Answer» E. | |
| 231. |
A measuring instrument is said to be a linear instrument, when |
| A. | The output of the meter is proportional to the input |
| B. | The meter's input is much higher than the output |
| C. | Motor's output is much less than the input |
| D. | suitable all |
| Answer» B. The meter's input is much higher than the output | |
| 232. |
Care should be taken for insulated combination pliers that, |
| A. | Won't throw down from a high place |
| B. | oil from time to time |
| C. | will not use as a hammer |
| D. | suitable all |
| Answer» E. | |
| 233. |
The simplest method of artificial respiration is? |
| A. | mouth-to-mouth breathing |
| B. | Shaffer method |
| C. | sylvester method |
| D. | neither of the above |
| Answer» B. Shaffer method | |
| 234. |
Transducer is a device which? |
| A. | Helps in the measurement of electrical signals |
| B. | converts one type of energy into another type of energy |
| C. | converts one type of power into another type of power |
| D. | same as transformer |
| Answer» C. converts one type of power into another type of power | |
| 235. |
Neutrons happen? |
| A. | without charge |
| B. | negatively charged |
| C. | positively charged |
| D. | suitable all |
| Answer» C. positively charged | |
| 236. |
Care should be taken while preparing the electrolyte of the battery? |
| A. | add water to acid |
| B. | pour acid and water together |
| C. | pour acid drop by drop into the water |
| D. | suitable all |
| Answer» D. suitable all | |
| 237. |
What is meant by Ferranti effect in transmission lines? |
| A. | Rise in voltage at the resolving end at the rear load |
| B. | Increase in voltage at the receiving end on the forward load |
| C. | Voltage rise at the receiving end at zero load |
| D. | none in suitable |
| Answer» D. none in suitable | |
| 238. |
Sodium vapor is filled in the tube of the lamp? |
| A. | Fluorescent Powder + Neon Gas |
| B. | mercury + neon gas |
| C. | sodium powder + neon gas |
| D. | Tungsten + Nitrogen |
| Answer» D. Tungsten + Nitrogen | |
| 239. |
By short circuiting the field coil of a synchronous motor, three phase supply is given to the motor. Motor ? |
| A. | will start like an induction motor and continue to run like a synchronous motor |
| B. | will start like an induction motor, and continue to run like an induction motor |
| C. | won't work |
| D. | will go |
| Answer» B. will start like an induction motor, and continue to run like an induction motor | |
| 240. |
What is a characteristic of a single phase motor? |
| A. | It requires only one winding |
| B. | it starts automatically |
| C. | it does not start automatically |
| D. | It can only rotate in one direction |
| Answer» D. It can only rotate in one direction | |
| 241. |
Ceiling fan is a capacitor motor? |
| A. | capacitor start capacitor run motor |
| B. | capacitor start motor |
| C. | Permanent Capacitor Motor |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 242. |
What is the name of the means of driving a slippering motor? |
| A. | Auto Transformer Starter |
| B. | star-delta starter |
| C. | DOL Starter |
| D. | rheostatic starter |
| Answer» E. | |
| 243. |
In a capacitor type fan motor the number of poles is 8 and the number of coils is 16 (starting and working they are equal number of coils.) What is the type of this winding? |
| A. | Double layer winding |
| B. | Full coil winding |
| C. | semi coil winding |
| D. | Single layer winding |
| Answer» C. semi coil winding | |
| 244. |
What is the advantage of synchronous motor over induction motor? |
| A. | Its torque does not change much when the supply voltage changes |
| B. | It can operate in the range of backward and forward power factors |
| C. | it moves at a constant speed |
| D. | suitable all |
| Answer» E. | |
| 245. |
What can cause no heating in a synchronous motor? |
| A. | change in frequency |
| B. | change in supply voltage |
| C. | constant change in load |
| D. | air friction losses |
| Answer» C. constant change in load | |
| 246. |
The reason for keeping the air gap between the armature and the stator very small in an electric motor is? |
| A. | improve air flow |
| B. | get strong magnetic field |
| C. | achieve high cruising speed |
| D. | make cruises easier |
| Answer» C. achieve high cruising speed | |
| 247. |
Electric press is used to supply the heater? |
| A. | connector with pin |
| B. | three pin tip |
| C. | porcelain connector |
| D. | two pin cap |
| Answer» D. two pin cap | |
| 248. |
D prevailed by prime mover |
| A. | D.C. |
| B. | A.C. |
| C. | Triangular |
| D. | square shape |
| Answer» C. Triangular | |
| 249. |
What precautions should be taken while using a hammer? |
| A. | Will work even with loose handles |
| B. | will hold the end of the handle in hand |
| C. | Grab the handle with the hammer |
| D. | put grease in the hammer |
| Answer» C. Grab the handle with the hammer | |
| 250. |
What are the fields of AC generator? |
| A. | static |
| B. | rotating pipe |
| C. | Both |
| D. | none of the suitable |
| Answer» D. none of the suitable | |