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.
| 151. |
Transformer is used in Voltage Specifier? |
| A. | auto transformer |
| B. | current transformer |
| C. | potassium transformer |
| D. | suitable all |
| Answer» B. current transformer | |
| 152. |
For which of the following applications D |
| A. | lighting arrangement |
| B. | pull motor |
| C. | machine shop motor |
| D. | Electrical home appliances |
| Answer» C. machine shop motor | |
| 153. |
Helium is used in neon symbols to obtain which color of light? |
| A. | Blue |
| B. | Green |
| C. | Red |
| D. | Yellow |
| Answer» E. | |
| 154. |
Thermostat is on the switch? |
| A. | copper leaves |
| B. | simple two leaves |
| C. | bimetallic strip |
| D. | suitable all |
| Answer» D. suitable all | |
| 155. |
What is the unit of deflection sensitivity of CRO? |
| A. | mm/m volt |
| B. | mm/volt |
| C. | meter / volt |
| D. | none of the suitable |
| Answer» B. mm/volt | |
| 156. |
Which type of damping is used in instruments in which the magnetic field is rare? |
| A. | whirlpool stream damping |
| B. | fluid friction damping |
| C. | air friction damping |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 157. |
The internal resistance of the ammeter should be very low for |
| A. | Maximum high voltage drop on meter |
| B. | high accuracy |
| C. | high sensitivity |
| D. | Minimum effect on current in the circuit |
| Answer» E. | |
| 158. |
Ampere meter, wattmeter, voltmeter are instruments? |
| A. | integrating type |
| B. | recording type |
| C. | indicating type |
| D. | suitable all |
| Answer» D. suitable all | |
| 159. |
What is the reason for voltage drop in alternator? |
| A. | Armature resistance and corrosion resistance |
| B. | armature resistance only |
| C. | armature, reactance, armature resistance and corrosion resistance |
| D. | suitable all |
| Answer» D. suitable all | |
| 160. |
What is the purpose of using fractional pitch winding? |
| A. | reducing harmonics in induced emf is |
| B. | reduce machine size |
| C. | To reduce the amount of copper in the winding |
| D. | reduce the cost of the machine |
| Answer» B. reduce machine size | |
| 161. |
In the two watt meter method, the readings of both the watt meters will be same, when |
| A. | weight is zero in one phase |
| B. | be the power multiplier unit |
| C. | power factor is 0.5 |
| D. | The power factor is zero |
| Answer» C. power factor is 0.5 | |
| 162. |
On increasing the value of resistance (R) in an RC series circuit, the phase angle is? |
| A. | does not change |
| B. | decreases |
| C. | grows |
| D. | none in suitable |
| Answer» C. grows | |
| 163. |
How can the speed of a two speed motor be reduced? |
| A. | By increasing the intensity of the magnetic field of the stator |
| B. | subtracting the capacitance |
| C. | increasing the capacitance |
| D. | By reducing the intensity of the magnetic field of the stator |
| Answer» E. | |
| 164. |
What is the function of transformer? |
| A. | converting electrical energy into mechanical energy |
| B. | converting mechanical energy into electrical energy |
| C. | increase electrical energy |
| D. | conversion of electrical energy at the same, higher or lower voltage |
| Answer» E. | |
| 165. |
The motor used in electrically operated toys is? |
| A. | capacitor motor |
| B. | shaded pole motor |
| C. | universal motor |
| D. | divider art motor |
| Answer» C. universal motor | |
| 166. |
How capacitors work in single phase motors? |
| A. | overloading the motor |
| B. | reducing motor efficiency |
| C. | To create phase difference in both the windings |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 167. |
How is the current value affected at resonance in a series RLC circuit? |
| A. | by the value of C |
| B. | by the value of L |
| C. | by the value of R |
| D. | By the value of R, L and C |
| Answer» D. By the value of R, L and C | |
| 168. |
Can the resistance of the earth be reduced? |
| A. | using two earth plates |
| B. | increasing the depth of the plate |
| C. | by pouring water |
| D. | suitable all |
| Answer» E. | |
| 169. |
The switch socket used in wiring is used in? |
| A. | Bakelite Fleece Type 6A 250V ISI |
| B. | Fleece Type 2A 220V ISI |
| C. | Fleece Type 6A 250V ISI |
| D. | Tumblr Type 5A |
| Answer» B. Fleece Type 2A 220V ISI | |
| 170. |
The deflection torque in moving iron machines is directly proportional to? |
| A. | class of current |
| B. | of the square root of the current |
| C. | cube root of current |
| D. | all of the above |
| Answer» B. of the square root of the current | |
| 171. |
The speed of slipping three phase induction motor can be controlled by |
| A. | By changing the resistance of the rotor winding |
| B. | changing the number of poles |
| C. | by changing the supply frequency |
| D. | suitable all |
| Answer» E. | |
| 172. |
What is the unit of amplification? |
| A. | Voltage |
| B. | decibel |
| C. | ampere |
| D. | all these |
| Answer» E. | |
| 173. |
Which motor has the same speed/load characteristics as a universal motor? |
| A. | ac motor |
| B. | dc shunt motor |
| C. | dc range motor |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 174. |
If one of the three phases of a three phase induction motor is disconnected while running on light load, then the motor will be |
| A. | will run at low speed |
| B. | will continue at the same speed |
| C. | will stop walking |
| D. | will run at high speed |
| Answer» C. will stop walking | |
| 175. |
What is the unit of non-conductivity of triode? |
| A. | Om |
| B. | Enchantment |
| C. | henry |
| D. | Voltage |
| Answer» B. Enchantment | |
| 176. |
Resistance is a property of the material of the element used in heating? |
| A. | high resistivity |
| B. | low melting point |
| C. | high heat coefficient |
| D. | all these |
| Answer» B. low melting point | |
| 177. |
Damping is done in moving coil electric device? |
| A. | by eddy current |
| B. | by air |
| C. | By fluids |
| D. | all these |
| Answer» B. by air | |
| 178. |
The part of the coil which is outside the stator code is called? |
| A. | waste material |
| B. | passive side |
| C. | active side |
| D. | coil wire |
| Answer» C. active side | |
| 179. |
Can luminescence be done with an electric light source? |
| A. | semi direct |
| B. | indirect lighting |
| C. | direct lighting |
| D. | all of the above |
| Answer» E. | |
| 180. |
Find out by the left hand rule? |
| A. | Direction of electric field, magnetic field and force on the conductor |
| B. | Self induction, mutual induction and direction of force on the conductor |
| C. | The direction of the current, the magnetizing force produced and the force acting on the conductor |
| D. | The direction of the current, the magnetic field and the force on the conductor |
| Answer» E. | |
| 181. |
What are the types of single phase and three phase power factor meters? |
| A. | electrodynamic |
| B. | Induction |
| C. | Thermocouple Type |
| D. | all these |
| Answer» B. Induction | |
| 182. |
What does it mean that the centrifugal switch is open? |
| A. | winding is short |
| B. | switch is short |
| C. | The winding is grounded |
| D. | winding is open |
| Answer» E. | |
| 183. |
When a 3-phase synchronous motor is switched on, a rotational magnetic field is produced. Flux of this field? |
| A. | Varies with power factor |
| B. | changes with load |
| C. | is fixed at all loads |
| D. | none of the suitable |
| Answer» D. none of the suitable | |
| 184. |
Are there parallel paths in wave winding? |
| A. | One |
| B. | Two |
| C. | three |
| D. | four |
| Answer» C. three | |
| 185. |
charge the battery? |
| A. | by metal-rectifier |
| B. | by motor-generator set |
| C. | by battery charger |
| D. | suitable all |
| Answer» E. | |
| 186. |
What is the main fuel in atomic power plant? |
| A. | uranium |
| B. | Selenium |
| C. | geranium |
| D. | cadmium |
| Answer» B. Selenium | |
| 187. |
What is the operating temperature of an electric stove with a pure filament? |
| A. | 1100'C to 1300'C |
| B. | 500'C to 600'C |
| C. | 300'C to 400'C |
| D. | 750'C to 900'C |
| Answer» E. | |
| 188. |
If a conductor is placed in a changing magnetic field, the electric flux force is generated in the conductor, the law is called? |
| A. | Helix's law |
| B. | Faraday's second law |
| C. | Faraday's first law |
| D. | Flemin's law |
| Answer» D. Flemin's law | |
| 189. |
Small circuit breaker used in domestic and commercial installations for MCB controller and protection, the compound of current determination of commercially available single pole MCB is? |
| A. | 2 to 6 amps |
| B. | 6 to 32 amps |
| C. | 0.5 to 60 amps |
| D. | 1 to 62 amps |
| Answer» C. 0.5 to 60 amps | |
| 190. |
Selenium rectifier 'weak' is detected by the following symptoms? |
| A. | operating feeling sluggish |
| B. | increasing input current |
| C. | output voltage drop |
| D. | suitable all signs |
| Answer» E. | |
| 191. |
What is the dielectric power of mica? |
| A. | (20-60 |
| B. | (15-20 |
| C. | (2-6 |
| D. | (12-17 |
| Answer» B. (15-20 | |
| 192. |
If there is a fire of wood, cardboard, cloth at some place, then which of the following will be used? |
| A. | phase type |
| B. | C. T. C. |
| C. | carbon di oxide |
| D. | Soda Acid Type |
| Answer» E. | |
| 193. |
230 volts to a capacitor |
| A. | 300V |
| B. | 325V |
| C. | 230V |
| D. | 450V |
| Answer» C. 230V | |
| 194. |
Use when connecting copper wire with aluminum wire? |
| A. | Standard PG clamp |
| B. | straight tube and nut connector |
| C. | Bimetallic universal PG clamp |
| D. | pressure regulator |
| Answer» D. pressure regulator | |
| 195. |
The element of emmersion heater is made of |
| A. | copper wire |
| B. | of nichrome wire |
| C. | eureka wire |
| D. | of magnet wire |
| Answer» C. eureka wire | |
| 196. |
Which of the following meters cannot be used on a running supply? |
| A. | Phase sequence tester and energy meter |
| B. | ohm meter-magger |
| C. | Wattmeter and Power Factor Meter |
| D. | Frequency Meter and Moving Iron Volt Meter |
| Answer» C. Wattmeter and Power Factor Meter | |
| 197. |
What is the internal tank of geyser made of so that it does not spoil even in salty water? |
| A. | tuflon |
| B. | tin coated copper |
| C. | aluminum |
| D. | mild steel |
| Answer» C. aluminum | |
| 198. |
What is the reason for the induction motor to draw more current at the time of starting? |
| A. | Zero Anti V.V. B. |
| B. | low power factor |
| C. | high voltage |
| D. | none of these |
| Answer» B. low power factor | |
| 199. |
Characteristics of low plate voltage in Trerod valve? |
| A. | Others display resistance5 |
| B. | show negative resistance |
| C. | show positive resistance |
| D. | show zero resistance |
| Answer» C. show positive resistance | |
| 200. |
What are zener diodes commonly used for? |
| A. | in auto transformer |
| B. | in amplification circuit |
| C. | in voltage stabilizer |
| D. | none of the suitable |
| Answer» D. none of the suitable | |