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.
| 401. |
function of commutator? |
| A. | completing the flux circuit |
| B. | generate field current |
| C. | converting DC to AC |
| D. | unidirectional current in the armature |
| Answer» E. | |
| 402. |
H² (on the scale) is marked on which meter? |
| A. | on the energy meter |
| B. | on watt meter |
| C. | on power factor meter |
| D. | on frequency meter |
| Answer» E. | |
| 403. |
Caution should be taken while using phase tester? |
| A. | 327C will not be used on a range of more than 500 volts |
| B. | will check insulation |
| C. | While checking, keep the finger on the metal clip and keep in touch with the earth |
| D. | suitable all |
| Answer» E. | |
| 404. |
The force which drives the flux in a magnetic field is called? |
| A. | M.M.F. |
| B. | flux density |
| C. | E.M.F. |
| D. | none of the suitable |
| Answer» B. flux density | |
| 405. |
A woman inadvertently touches the metallic part of a kettle in running state, she gets an electric shock, the reason is? |
| A. | The fuse wire of the circuit is of greater capacity |
| B. | there is no water in the kettle |
| C. | safety plug is faulty |
| D. | Kettle is not grounded |
| Answer» E. | |
| 406. |
In what range is the 100kΩ resistance? |
| A. | low |
| B. | medium |
| C. | high |
| D. | quite high |
| Answer» C. high | |
| 407. |
Where do bayonet cap type holders come from? |
| A. | in incandescent lamp |
| B. | in a 500 watt lamp |
| C. | MA Type in Mercury Lamp |
| D. | suitable all |
| Answer» B. in a 500 watt lamp | |
| 408. |
The gas used for gas welding? |
| A. | helium and nitrogen |
| B. | nitrogen and oxygen |
| C. | acetylene and oxygen |
| D. | hydrogen and nitrogen |
| Answer» D. hydrogen and nitrogen | |
| 409. |
Which of the following electrical equipment will be connected to the same connector for measurement? |
| A. | Voltmeter-PFmeter |
| B. | Voltmeter-Frequency Meter |
| C. | Frequency meter- PF meter |
| D. | Wattmeter- voltmeter |
| Answer» C. Frequency meter- PF meter | |
| 410. |
by thermocouple method |
| A. | Both AC and DC are made |
| B. | DC electricity is generated |
| C. | AC static electricity is generated |
| D. | AC electricity is generated |
| Answer» C. AC static electricity is generated | |
| 411. |
A self starter is used to start the engine in a vehicle, it is called? |
| A. | D. C. Compound meter |
| B. | DC Shunt Motor |
| C. | DC Series Motor |
| D. | none of these |
| Answer» D. none of these | |
| 412. |
Railway is used in train engine? |
| A. | D. C. Compound motor |
| B. | DC Shunt Motor |
| C. | DC Series Motor |
| D. | none of these |
| Answer» D. none of these | |
| 413. |
Equalizer Bus Bar Is your company? |
| A. | Compound generators are not required for parallel operation |
| B. | Suitable for parallel operation of compound generators |
| C. | Required for parallel operation of compound generators |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 414. |
Flexible conduit is used for? |
| A. | meter to pole |
| B. | meter to board |
| C. | In combination from panels to machines |
| D. | suitable all |
| Answer» D. suitable all | |
| 415. |
In order to increase the power factor, the rating of the capacitor is |
| A. | will |
| B. | LEFT |
| C. | KW |
| D. | voltage |
| Answer» C. KW | |
| 416. |
The direction of rotation of the series motor? |
| A. | Both field and supply terminals can be reversed |
| B. | Can be changed only by reverse field terminal |
| C. | Can be changed only by reverse supply terminal |
| D. | none of the suitable |
| Answer» C. Can be changed only by reverse supply terminal | |
| 417. |
D in alternator |
| A. | compound generator |
| B. | shunt generator |
| C. | range generator |
| D. | separately excited generator |
| Answer» C. range generator | |
| 418. |
What size wire should house wiring be? |
| A. | 25 of SWGE wire |
| B. | 20 SWG of copper |
| C. | 14 SWG of copper |
| D. | 8swg GIR Wire |
| Answer» D. 8swg GIR Wire | |
| 419. |
A bar magnet is bent in the form of L. Magnetic moment of a bent magnet? |
| A. | will be times the initial value |
| B. | will be half of the initial value |
| C. | will be zero |
| D. | will not convert |
| Answer» B. will be half of the initial value | |
| 420. |
The positive end of a full charged lead acid battery will be? |
| A. | of white |
| B. | dark green |
| C. | dark brown |
| D. | dark blue |
| Answer» D. dark blue | |
| 421. |
Is hysteresis necessary to reduce loss? |
| A. | high resistivity |
| B. | low resistivity |
| C. | greater area of the BH curve |
| D. | Low hysteresis coefficient |
| Answer» E. | |
| 422. |
In nickel iron cell decomposition takes place? |
| A. | dilute sulfuric acid |
| B. | dilute ammonium hydroxide |
| C. | dilute hydrochloric acid |
| D. | dilute potassium hydroxide |
| Answer» E. | |
| 423. |
Be careful when using a screwdriver? |
| A. | screwdriver hammer on the handle of the screwdriver |
| B. | according to the size of the screw |
| C. | Will not use it in place of Chaursi |
| D. | suitable all |
| Answer» E. | |
| 424. |
µF is called? |
| A. | Capacitor Capacitance |
| B. | Capacitor efficiency |
| C. | heat of capacitor |
| D. | none of the suitable |
| Answer» B. Capacitor efficiency | |
| 425. |
It is made to increase the current rating and flexibility of the cable. |
| A. | stranded |
| B. | by single wire |
| C. | by tying many wires like a rope |
| D. | neither of the above |
| Answer» C. by tying many wires like a rope | |
| 426. |
What is the melting point of spelter? |
| A. | 580॰C |
| B. | 600॰C |
| C. | 700॰C |
| D. | 730॰C |
| Answer» C. 700॰C | |
| 427. |
Frequency on increasing the speed of the alternator? |
| A. | increases |
| B. | happens |
| C. | remains unchanged |
| D. | none of the above |
| Answer» B. happens | |
| 428. |
Site cutting plier is used for? |
| A. | copper wire cutting |
| B. | in cutting wood |
| C. | G-1 wire cutting |
| D. | suitable in all |
| Answer» B. in cutting wood | |
| 429. |
The speed of the Universal itself is limited at zero load, because of this? |
| A. | armature reaction |
| B. | wind and friction effect |
| C. | supply volume |
| D. | number of poles |
| Answer» D. number of poles | |
| 430. |
The color of mineral oil used in transformer is initially? |
| A. | dark brown |
| B. | Yellow |
| C. | colorless |
| D. | white brown |
| Answer» C. colorless | |
| 431. |
Induced voltage in the stator of a synchronous motor |
| A. | on rotor excitation only |
| B. | on both rotor excitation and speed |
| C. | at rotor speed only |
| D. | only at load angle |
| Answer» B. on both rotor excitation and speed | |
| 432. |
Which of the following is a device |
| A. | motor-generator |
| B. | Amplifier |
| C. | mercury arc rectifier |
| D. | motor converter |
| Answer» C. mercury arc rectifier | |
| 433. |
opposing voltage in synchronous motor |
| A. | up to speed |
| B. | on load |
| C. | on the stimulus |
| D. | on all of the above |
| Answer» D. on all of the above | |
| 434. |
What is the inverse of reactance called? |
| A. | conductance |
| B. | Admittance |
| C. | susceptance |
| D. | all of the above |
| Answer» D. all of the above | |
| 435. |
Capacitor capacitance is inversely proportional to? |
| A. | of dielectric material |
| B. | of dielectric heating |
| C. | of the thickness of the dielectric material |
| D. | none of the above |
| Answer» D. none of the above | |
| 436. |
If soldering is to be done on a zinc sheet, what flux would you use? |
| A. | zinc chloride acid |
| B. | turpentine acid |
| C. | resins |
| D. | hydrochloric acid |
| Answer» E. | |
| 437. |
To the unconscious person after first aid? |
| A. | will be taken to the first aid center |
| B. | take him home |
| C. | leave it there |
| D. | will inform at his house |
| Answer» B. take him home | |
| 438. |
In open coil winding the ends of the winding are kept? |
| A. | short circuit |
| B. | Independent |
| C. | open circuit |
| D. | none of these |
| Answer» C. open circuit | |
| 439. |
What is the above motor for electric clock? |
| A. | Cage Rotor Induction Motor |
| B. | synchronous motor |
| C. | a. C. Series Motor |
| D. | DC Shunt Motor |
| Answer» C. a. C. Series Motor | |
| 440. |
The point from which maximum magnetic lines of force emerge? |
| A. | unit magnetic pole |
| B. | magnetic pole |
| C. | both A and B |
| D. | none of the above |
| Answer» C. both A and B | |
| 441. |
Watt meter is useful? |
| A. | to measure energy |
| B. | to measure power |
| C. | to measure voltage |
| D. | to measure current |
| Answer» C. to measure voltage | |
| 442. |
Two holes are made face to face in the disc of Energy Mitra? |
| A. | To prevent cringe effect |
| B. | To prevent hunting effect |
| C. | by adding to the oscillating series |
| D. | all of the above |
| Answer» B. To prevent hunting effect | |
| 443. |
If the distance between the plates in a capacitor is halved, then the capacity of the capacitor will be |
| A. | four times less |
| B. | half less |
| C. | twice more |
| D. | four times more |
| Answer» D. four times more | |
| 444. |
Regulator is added in ceiling fan? |
| A. | to reduce current |
| B. | to reduce speed |
| C. | to lower the voltage |
| D. | all of the above |
| Answer» E. | |
| 445. |
Do moving coil instruments work? |
| A. | on AC only |
| B. | only on DC |
| C. | on both DC and AC |
| D. | none of the above |
| Answer» C. on both DC and AC | |
| 446. |
Which of the following motors has the highest starting torque? |
| A. | split phase motor |
| B. | shaded pole motor |
| C. | capacitor start motor |
| D. | repulsion motor |
| Answer» D. repulsion motor | |
| 447. |
The decay of a silicon rectifier is indicated by? |
| A. | decrease in output voltage |
| B. | sluggishly |
| C. | incrementally |
| D. | from all the above factors |
| Answer» E. | |
| 448. |
What will be the torque produced when a single phase supply is given in a single phase winding? |
| A. | stable |
| B. | pulsating |
| C. | fluctuating |
| D. | rotating |
| Answer» B. pulsating | |
| 449. |
The property of a material which opposes the generation of magnetic flux in it? |
| A. | magnetic carrier force |
| B. | Magnetism |
| C. | Pratishtambh |
| D. | reputation |
| Answer» D. reputation | |
| 450. |
The container in a lead acid cell is made of? |
| A. | sulphurous rubber |
| B. | plain rubber |
| C. | Of stole |
| D. | plastic |
| Answer» B. plain rubber | |