McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 201. |
A wound rotor induction motor is preferred over squirrel cage induction motor when the major consideration involved is |
| A. | high starting torque |
| B. | low starting current |
| C. | speed control over limited range |
| D. | all of the above. |
| Answer» D. all of the above. | |
| 202. |
When smooth and precise speed control over a wide range is desired, the motor preferred is |
| A. | synchronous motor |
| B. | squirrel cage induction motor |
| C. | wound rotor induction motor |
| D. | dc motor. |
| Answer» D. dc motor. | |
| 203. |
When quick speed reversal is a consideration, the motor preferred is |
| A. | synchronous motor |
| B. | squirrel cage induction motor |
| C. | wound rotor induction motor |
| D. | dc motor. |
| Answer» D. dc motor. | |
| 204. |
Stator voltage control for speed control of induction motors is suitable for |
| A. | fan and pump drives |
| B. | drive of a crane |
| C. | running it as generator |
| D. | constant load drive. |
| Answer» A. fan and pump drives | |
| 205. |
The selection of control gear for a particular application is based on the consideration of |
| A. | duty |
| B. | starting torque |
| C. | limitations on starting current |
| D. | all of the above. |
| Answer» D. all of the above. | |
| 206. |
As compared to squirrel cage induction motor, a wound rotor induction motor is preferred when the major consideration is |
| A. | high starting torque |
| B. | low windage losses |
| C. | slow speed operation |
| D. | all of the above. |
| Answer» A. high starting torque | |
| 207. |
A synchronous motor is found to be more economical when the load is above |
| A. | 1 kW |
| B. | 10 kW |
| C. | 20 kW |
| D. | 100kW. |
| Answer» D. 100kW. | |
| 208. |
The advantage of a synchronous motor in addition to its constant speed is |
| A. | high power factor |
| B. | better efficiency |
| C. | lower cost |
| D. | all of the above. |
| Answer» A. high power factor | |
| 209. |
In motor circuit static frequency changers are used for |
| A. | power factor improvement |
| B. | improved cooling |
| C. | reversal of direction |
| D. | speed regulation. |
| Answer» D. speed regulation. | |
| 210. |
In case of traveling cranes, the motor preferred for boom hoist is |
| A. | AC slip ring motor |
| B. | Ward Leonard controlled DC shunt motor |
| C. | Synchronous motor |
| D. | Single phase motor. |
| Answer» A. AC slip ring motor | |
| 211. |
The characteristics of drive for. crane hoisting and lowering is |
| A. | smooth movement |
| B. | precise control |
| C. | fast speed control |
| D. | all of the above. |
| Answer» D. all of the above. | |
| 212. |
The capacity of a crane is expressed in terms of |
| A. | Span |
| B. | Type of drive |
| C. | Tonnes |
| D. | Any of the above. |
| Answer» C. Tonnes | |
| 213. |
The traveling speed of cranes varies from |
| A. | 1 to 2.5 m/s |
| B. | 5 to 15 m/s |
| C. | 20 to 22.5 m/s |
| D. | 25 to 40 m/s. |
| Answer» A. 1 to 2.5 m/s | |
| 214. |
In overhead traveling cranes |
| A. | continuous duty motors are used |
| B. | slow speed motors are preferred |
| C. | short time rated motors arc preferred |
| D. | none of the above. |
| Answer» C. short time rated motors arc preferred | |
| 215. |
15 minute rated motors are suitable for |
| A. | light duty cranes |
| B. | medium duty cranes |
| C. | heavy duty cranes |
| D. | all of the above. |
| Answer» A. light duty cranes | |
| 216. |
Light duty cranes are generally used in |
| A. | automobile workshops |
| B. | pumping stations |
| C. | power houses |
| D. | All of the above. |
| Answer» D. All of the above. | |
| 217. |
Heavy duty cranes are used in |
| A. | Heavy engineering workshops |
| B. | Steel plants |
| C. | Ore handling plants |
| D. | All of the above. |
| Answer» D. All of the above. | |
| 218. |
1/2 hour rated motors are used for |
| A. | light duty cranes |
| B. | medium duty cranes |
| C. | heavy duty cranes |
| D. | none of the above. |
| Answer» B. medium duty cranes | |
| 219. |
Which of the following drive can be used for derricks and winches ? |
| A. | DC motors with Ward Leonard control |
| B. | AC slip-ring motors with variable resistance |
| C. | Pole changing squirrel cage motors |
| D. | Any of the above. |
| Answer» D. Any of the above. | |
| 220. |
The number of sets used in pole changing type squirrel cage motors for derricks and winches, is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6. |
| Answer» B. 3 | |
| 221. |
A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the medium speed is used for |
| A. | lifting |
| B. | hoisting |
| C. | lowering |
| D. | landing the load. |
| Answer» A. lifting | |
| 222. |
A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the lowest speed is used for |
| A. | lifting |
| B. | hoisting |
| C. | lowering |
| D. | landing the load. |
| Answer» D. landing the load. | |
| 223. |
For handing fragile articles in a crane |
| A. | low speed is preferred |
| B. | medium speed is preferred |
| C. | high speed is preferr |
| Answer» A. low speed is preferred | |
| 224. |
The range of horse power of electric motor drives for rolling mills is of the order of |
| A. | 1 to 10 HP |
| B. | 15 to 25 HP |
| C. | 50 to 100 HP |
| D. | 100 to 500 HP. |
| Answer» D. 100 to 500 HP. | |
| 225. |
Motors preferred for rolling mill drive is |
| A. | dc motors |
| B. | ac slip ring motors with speed control |
| C. | any of the above |
| D. | none of the above. |
| Answer» C. any of the above | |
| 226. |
The .......motors, because of their inherent characteristics, are best suited for the rolling mills |
| A. | dc motors |
| B. | slip ring induction motors |
| C. | squirrel cage induction motors |
| D. | single phase motors. |
| Answer» A. dc motors | |
| 227. |
In case of kiln drives |
| A. | starting torque is almost zero |
| B. | starting torque and running torque are nearly equal |
| C. | starting torque is more than double of the running torque. |
| D. | all |
| Answer» C. starting torque is more than double of the running torque. | |
| 228. |
Motor preferred for kiln drives is usually |
| A. | slip ring induction motor |
| B. | three phase shunt wound commutator motor |
| C. | cascade controlled ac motor |
| D. | any of the above. |
| Answer» D. any of the above. | |
| 229. |
Belt conveyors offer |
| A. | zero starting torque |
| B. | low starting torque |
| C. | medium starting torque |
| D. | high starting torque. |
| Answer» D. high starting torque. | |
| 230. |
In case belt conveyors |
| A. | squirrel cage motors with direct-on-line starters are used |
| B. | single phase induction motors are used |
| C. | dc shunt motors are used |
| D. | induction motors with star-delta starters are used. |
| Answer» A. squirrel cage motors with direct-on-line starters are used | |
| 231. |
Which of the following motor is preferred for blowers ? |
| A. | wound rotor induction motor |
| B. | squirrel cage induction motor |
| C. | dc shunt motor |
| D. | dc series motor. |
| Answer» B. squirrel cage induction motor | |
| 232. |
Centrifugal pumps are usually driven by |
| A. | dc shunt motors |
| B. | dc series motors |
| C. | squirrel cage induction motors |
| D. | any of the above. |
| Answer» C. squirrel cage induction motors | |
| 233. |
In case of centrifugal pumps the starting torque is generally |
| A. | double the running torque |
| B. | slightly more than running torque |
| C. | same as running torque |
| D. | less than running torque. |
| Answer» D. less than running torque. | |
| 234. |
In a centrifugal pump if the liquid to be pumped has density twice that of water, then the horse power required (as compared to that while pumping water) will be |
| A. | half |
| B. | same |
| C. | double |
| D. | four times. |
| Answer» C. double | |
| 235. |
Wound rotor and squirrel-cage motors with high slip which develop maximum torque at stand still are used for |
| A. | machine tools |
| B. | presses and punches |
| C. | elevators |
| D. | all of the above. |
| Answer» B. presses and punches | |
| 236. |
Belted slip ring induction motor is almost invariably used for |
| A. | centrifugal blowers |
| B. | jaw crushers |
| C. | water pumps |
| D. | screw pumps. |
| Answer» B. jaw crushers | |
| 237. |
A solar cell converts light energy into __________ |
| A. | Electrical energy |
| B. | Thermal energy |
| C. | Sound energy |
| D. | Heat energy |
| Answer» A. Electrical energy | |
| 238. |
There are three types of the solar cells. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» A. True | |
| 239. |
The output power of the centrifugal pump is proportional to the _________ of the speed. |
| A. | Square |
| B. | Cube |
| C. | Square-root |
| D. | Cube-root |
| Answer» B. Cube | |
| 240. |
There are four types of Water pumps. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» B. False | |
| 241. |
The output of the Solar panel is DC. |
| A. | True |
| B. | False |
| C. | none |
| D. | all |
| Answer» A. True | |
| 242. |
Which of the relationship is correct in Permanent magnet DC motor? |
| A. | T ∝ (I(A)2 |
| B. | T ∝ (I(A)0 |
| C. | T ∝ Ia |
| D. | T2 ∝ Ia |
| Answer» C. T ∝ Ia | |
| 243. |
Which of the relationship is correct in Permanent magnet DC motor? |
| A. | E ∝ (N) |
| B. | E ∝ (N) |
| C. | E ∝ N |
| D. | E2 ∝ N |
| Answer» C. E ∝ N | |
| 244. |
Who made the first solar cell? |
| A. | Gerald Pearson |
| B. | Tim Bell |
| C. | Tim Cook |
| D. | Nicola Tesla |
| Answer» A. Gerald Pearson | |
| 245. |
When was the first solar cell invented? |
| A. | 1950 |
| B. | 1954 |
| C. | 1965 |
| D. | 1952 |
| Answer» B. 1954 | |
| 246. |
Which of the following is an advantage of electric traction over other methods of traction ? |
| A. | Faster acceleration |
| B. | No pollution problems |
| C. | Better braking action |
| D. | All of the above |
| Answer» A. Faster acceleration | |
| 247. |
Which of the following is the voltage for single phase A.C. system ? |
| A. | 22 V |
| B. | 440 V |
| C. | 5 kV |
| D. | 15 kV |
| Answer» A. 22 V | |
| 248. |
Long distance railways use which of the following ? |
| A. | 200 V D.C. |
| B. | 25 kV single phase A.C. |
| C. | 25 kV two phase A.C. |
| D. | 25 kV three phase A.C. |
| Answer» B. 25 kV single phase A.C. | |
| 249. |
The speed of a locomotive is controlled by |
| A. | flywheel |
| B. | gear box |
| C. | applying brakes |
| D. | regulating steam flow to engine |
| Answer» D. regulating steam flow to engine | |
| 250. |
Main traction systems used in India are, those using |
| A. | electric locomotives |
| B. | diesel engine locomotives |
| C. | steam engine locomotives |
| D. | all of the above |
| Answer» D. all of the above | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.