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.
| 301. |
There is a sudden flow of current on the overhead line, if you are there, what will you do? |
| A. | Will inform your supervisor |
| B. | Will pull the person who comes in contact with the hand by holding the hand |
| C. | Will turn off the supply by reaching the sub-station itself or the main switch |
| D. | will throw the iron chain on the wires |
| Answer» E. | |
| 302. |
To control one lamp from three places will it be used? |
| A. | Intermediate switch |
| B. | one-way switch |
| C. | two-way switch |
| D. | All of the above |
| Answer» B. one-way switch | |
| 303. |
The capacitance of a capacitor is proportional to? |
| A. | the relative resistance of the material to the plates |
| B. | the area of the plates |
| C. | of the plates |
| D. | thermal coefficient of a substance |
| Answer» C. of the plates | |
| 304. |
What are the precautions to be taken for hand drill machine? |
| A. | While operating the machine, press the handle straight |
| B. | Before making a hole in the sheet of metals, mark it with a center punch. |
| C. | Drillbit-jaw will fit snugly in the mouth |
| D. | suitable all |
| Answer» E. | |
| 305. |
Characteristics of Arc? |
| A. | have a motivational tendency |
| B. | have positive resistance |
| C. | lines are resistant |
| D. | have negative resistance |
| Answer» C. lines are resistant | |
| 306. |
Emmersion heater works? |
| A. | To heat water by fitting in taps |
| B. | to heat milk in the kitchen |
| C. | to heat water in a bucket |
| D. | suitable all |
| Answer» D. suitable all | |
| 307. |
If the armature coil of the mixer is open, then |
| A. | the mixer will be hot |
| B. | Mixer will run at low speed |
| C. | Mixer will run at high speed |
| D. | mixer won't work |
| Answer» E. | |
| 308. |
Is induction heating possible? |
| A. | Only A. c. on supply |
| B. | only on magnetic materials |
| C. | only on ferrous materials |
| D. | On DC supply only |
| Answer» B. only on magnetic materials | |
| 309. |
When a cage induction motor is directly connected to D |
| A. | 5 to 7 times the full-load current |
| B. | three times the full-load current |
| C. | double the full load current |
| D. | equal to full load current |
| Answer» B. three times the full-load current | |
| 310. |
What is the break down voltage of zener diode? |
| A. | 500 to 1100V |
| B. | 50 to 500V |
| C. | 2 to 200V |
| D. | 100 to 1000V |
| Answer» D. 100 to 1000V | |
| 311. |
What is the temperature control device in automatic electric iron? |
| A. | soul-plate |
| B. | Thermostat |
| C. | Heat-fiber |
| D. | pressure plate |
| Answer» C. Heat-fiber | |
| 312. |
Pure germanium at oK? |
| A. | high resistance driver |
| B. | is a bad conductor |
| C. | the driver is |
| D. | none in suitable |
| Answer» C. the driver is | |
| 313. |
In which instrument does the deflection depend on the mean value? |
| A. | moving coil meter |
| B. | rectifier meter |
| C. | moving iron meter |
| D. | hotwire meter |
| Answer» C. moving iron meter | |
| 314. |
What is the voltage across each disc of a suspension type insulator? |
| A. | the distribution is uneven |
| B. | is zero |
| C. | the distribution is the same |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 315. |
Can the range of watt-meter be increased? |
| A. | by resisting |
| B. | by putting capacitors |
| C. | By applying CT and PT |
| D. | by choke |
| Answer» D. by choke | |
| 316. |
The shedding ring of copper is placed on the current coil of the energy meter? |
| A. | Power to increase speed disc |
| B. | to increase the frequency |
| C. | to correct the power factor |
| D. | to increase |
| Answer» D. to increase | |
| 317. |
What is a copper oxide rectifier? |
| A. | electronic rectifier |
| B. | Mercury Rectifier |
| C. | metal rectifier |
| D. | suitable all |
| Answer» D. suitable all | |
| 318. |
Can the range of volt meter be increased? |
| A. | By adding to the capacitor series |
| B. | Adding a Multiplier to the Series |
| C. | By adding high resistance to the series |
| D. | By adding to the choke series |
| Answer» D. By adding to the choke series | |
| 319. |
Use of cross in arc rectifier? |
| A. | Ionization is done for the medium |
| B. | like a cathode |
| C. | Node is like |
| D. | suitable all |
| Answer» C. Node is like | |
| 320. |
Half-wave rectifier circuit requires |
| A. | of a diode |
| B. | of two diodes |
| C. | For bridge connection of four diodes |
| D. | For bridge connection of four metal rectifiers |
| Answer» B. of two diodes | |
| 321. |
Which of the following instrument has only a |
| A. | Thermocouple Type Instrument |
| B. | electrostatic type instrument |
| C. | dynamometer type instrument |
| D. | induction type instrument |
| Answer» E. | |
| 322. |
How to generate electron and cathode spots in mercury arc dielectric? |
| A. | node is heated |
| B. | rectifier is zeroed out |
| C. | Auxiliary electrode is used |
| D. | A heater is used in the rectifier |
| Answer» D. A heater is used in the rectifier | |
| 323. |
The motor used in electric shaving machine is? |
| A. | capacitor motor |
| B. | shaded pole motor |
| C. | universal motor |
| D. | reluctance motor |
| Answer» D. reluctance motor | |
| 324. |
At what power factor does a synchrome motor run? |
| A. | Leading |
| B. | lagging |
| C. | unity factor |
| D. | suitable all |
| Answer» E. | |
| 325. |
Which of the following motors is used when the load increases with speed? |
| A. | sharp motor |
| B. | 1-phase series motor |
| C. | Hysteresis motor |
| D. | induction motor |
| Answer» C. Hysteresis motor | |
| 326. |
What is the starting torque of a single phase induction motor? |
| A. | Equals from zero speed to highest speed |
| B. | is high |
| C. | is almost zero |
| D. | happens below |
| Answer» D. happens below | |
| 327. |
What is the capacity of Tubelight not available? |
| A. | 20W |
| B. | 40W |
| C. | 80W |
| D. | 100W |
| Answer» E. | |
| 328. |
What is the full name of MAT type lamp? |
| A. | Mercury Active Tungsten Lamp |
| B. | Mercury Oxygen Tungsten Lamp |
| C. | Mercury Argon Tungsten Lamp |
| D. | suitable all |
| Answer» D. suitable all | |
| 329. |
Generally the slipring three phase induction motor is started by |
| A. | DOL Starter |
| B. | auto transformer starter |
| C. | star-delta starter |
| D. | stator-rotor resistance starter |
| Answer» E. | |
| 330. |
There is a special switch in MAT type lamp, its name is |
| A. | thermal switch |
| B. | single way switch |
| C. | Two-way switch |
| D. | suitable all |
| Answer» B. single way switch | |
| 331. |
From power transmission at high voltage? |
| A. | No effect on voltage regulation |
| B. | Voltage regulation is poor |
| C. | Voltage regulation is good |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 332. |
Synchronous motor speed ? |
| A. | Depends on resistance in stator or rotor |
| B. | Voltage can be increased or decreased by converting |
| C. | is stable |
| D. | depends on the load |
| Answer» D. depends on the load | |
| 333. |
Exciter used in alternator? |
| A. | DC. shunt motor is |
| B. | DC. category generator is |
| C. | DC. range is motor |
| D. | DC. shunt generator is |
| Answer» E. | |
| 334. |
What is the sequence of phases in an alternator? |
| A. | BRY |
| B. | YRB |
| C. | RBY |
| D. | FISH |
| Answer» E. | |
| 335. |
Which material is suitable for magnetic circuit for operation at high flux density? |
| A. | soft iron |
| B. | ferro cobalt |
| C. | cast iron |
| D. | graycast iron |
| Answer» C. cast iron | |
| 336. |
Transformer D |
| A. | can convert at the same voltage |
| B. | can do more |
| C. | can reduce |
| D. | none of the suitable |
| Answer» E. | |
| 337. |
What is meant by high regulation in transformer? |
| A. | Minimum voltage change from zero load to full load |
| B. | Minimum difference between primary and secondary voltage |
| C. | Highest voltage change from zero load to full load |
| D. | low iron losses |
| Answer» B. Minimum difference between primary and secondary voltage | |
| 338. |
What is detected by short circuit test in transformer? |
| A. | capper loss |
| B. | iron loss |
| C. | hysteresis loss |
| D. | AD current loss |
| Answer» B. iron loss | |
| 339. |
What is the name of the test to find out the iron loss in a transformer? |
| A. | open and short circuit test |
| B. | open circuit test |
| C. | short circuit test |
| D. | suitable all |
| Answer» C. short circuit test | |
| 340. |
On what principle does a transformer work? |
| A. | On Farad's law of electromagnet |
| B. | on Fleming's law |
| C. | On mutual induction |
| D. | suitable at all |
| Answer» D. suitable at all | |
| 341. |
In star connection the line voltage stays with the phase current? |
| A. | 90॰ |
| B. | 30॰ |
| C. | 120॰ |
| D. | suitable all |
| Answer» C. 120॰ | |
| 342. |
by using interpol |
| A. | Sparking at the commutator is reduced |
| B. | counter emf is low |
| C. | motor speed increases |
| D. | armature current is converted to dc |
| Answer» B. counter emf is low | |
| 343. |
On increasing the Q component of a coil? |
| A. | Power factor remains unchanged |
| B. | power factor decreases |
| C. | power factor increases |
| D. | Power dissipation may increase or decrease |
| Answer» C. power factor increases | |
| 344. |
The full load current of a 20HP, 200V DC motor will be approximately? |
| A. | 35A |
| B. | 60A |
| C. | 80A |
| D. | 100A |
| Answer» B. 60A | |
| 345. |
The most suitable generator for feeding a long transmission line is |
| A. | Under Compound D.C. Generator |
| B. | Flat Compound D.C. Generator |
| C. | Over compound D.C. Generator |
| D. | Differential compound D.C. Generator |
| Answer» B. Flat Compound D.C. Generator | |
| 346. |
Meaning resistance? |
| A. | 2.0Ω on small power stations |
| B. | 1.0Ω at Major Power Stations |
| C. | 0.5Ω at large power stations |
| D. | suitable all |
| Answer» D. suitable all | |
| 347. |
If the field winding of a moving shunt motor suddenly breaks, then |
| A. | it starts giving sparks |
| B. | its speed decreases |
| C. | its speed becomes very high |
| D. | it stops instantly |
| Answer» D. it stops instantly | |
| 348. |
Interpol connections are made? |
| A. | in order of armature |
| B. | in series of shunt winding |
| C. | in order of weight |
| D. | suitable all |
| Answer» B. in series of shunt winding | |
| 349. |
What is the lowest resistance in a compound motor? |
| A. | of shunt winding |
| B. | of armature |
| C. | of series winding |
| D. | none of these |
| Answer» C. of series winding | |
| 350. |
The amount of electromotive force produced is directly proportional to the change in magnetic flux, the rule is? |
| A. | Helix's law |
| B. | Farad's second law |
| C. | Farad's first law |
| D. | all three is correct |
| Answer» C. Farad's first law | |