MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In an autotransformer of voltage ratio V1/V2V1u003eV2, the fraction of power transferred inductively is proportional to |
| A. | V1/ (V1+V |
| B. | 2)V2/V1 |
| C. | (V1-V2) / (V1+V2) |
| D. | (V1-V2) /V1 |
| Answer» E. | |
| 2. |
If K is the phase-to-phase voltage ratio, then the line-to-line voltage ratio in a 3-phase Y—? transformer is |
| A. | K |
| B. | K/v3 |
| C. | v3K |
| D. | v3/K |
| Answer» D. v3/K | |
| 3. |
In a 3-phase induction motor crawling happens at |
| A. | any speed |
| B. | no-load speed |
| C. | odd multiples of fundamental |
| D. | even multiplies of fundamental |
| Answer» D. even multiplies of fundamental | |
| 4. |
a moving coil instrument has a resistance of 10O and gives full scale defection at 0.5 V potential difference across it. how it be adapted to measure a current upto 100 A |
| A. | By connecting shunt resistance of 0.005O across the meter |
| B. | By connecting shunt resistance of 0.05O across the meter |
| C. | By connecting shunt resistance of 5O across the meter |
| D. | By connecting shunt resistance of 10O across the meter |
| Answer» B. By connecting shunt resistance of 0.05O across the meter | |
| 5. |
In moving iron instruments, the iron moves in a direction to cause |
| A. | coil inductance to be constant |
| B. | mutual inductance to be minimum |
| C. | minimum reluctance path |
| D. | decrease in the flux passing through it |
| Answer» D. decrease in the flux passing through it | |
| 6. |
If current through the operating coil of a moving iron instrument is doubled,the operating force becomes |
| A. | one and a half times |
| B. | 2 times |
| C. | 3 times |
| D. | 4 times |
| Answer» E. | |
| 7. |
Which of the following instruments has the highest torque/weight ratio among the given instruments ? |
| A. | Attraction type MI instrument |
| B. | Repulsion type MI instrument |
| C. | Permanent magnet moying coil instrument |
| D. | Electrodynamometer instrument |
| Answer» D. Electrodynamometer instrument | |
| 8. |
a 4-pole, 3-phase induction motor runs at 1440 rpm on a 50 Hz supply. find the slip speed. |
| A. | 2940 rpm |
| B. | 1500 rpm |
| C. | 1440 rpm |
| D. | 60 rpm |
| Answer» E. | |
| 9. |
The material to be used in the manufacture of a standard resistor should be of |
| A. | low resistivity |
| B. | highresistivityandlowtemperature coefficient |
| C. | high temperature coefficient |
| D. | lowresistivityandhightemperature coefficient |
| Answer» C. high temperature coefficient | |
| 10. |
The multiplying power of the shunt of a milliammeter is 8. If the circuit current is 200 mA, then current through the meter is |
| A. | 25 mA |
| B. | 200 mA |
| C. | 1600 mA |
| D. | 3200 mA |
| Answer» B. 200 mA | |
| 11. |
two holes are drilled in the disc on a diameter of energy-meter to |
| A. | increase ventilation |
| B. | reduce the weight of disc |
| C. | eliminate creeping on no-load |
| D. | increase deflecting torque |
| Answer» D. increase deflecting torque | |
| 12. |
In which of the following transformers, is the secondary winding always kept closed ? |
| A. | Current transformer |
| B. | potential transformer |
| C. | power transformer |
| D. | distribution transformer |
| Answer» B. potential transformer | |
| 13. |
In electrodynamometer ammeter,the deflection of the pointer is proportional to |
| A. | meanofcurrentsinfixedcoiland moving coil |
| B. | square of the current in moving coil |
| C. | RMS value of current in fixed coil |
| D. | mean-square of currents in fixed coil and moving coil |
| Answer» E. | |
| 14. |
The reactance of 1 farad capacitance when connected to a DC circuit is |
| A. | infinite |
| B. | 1Ω |
| C. | 0.5Ω |
| D. | zero ohms |
| Answer» B. 1Ω | |
| 15. |
A series circuit has R =..4 0, XL = 12 E2 and Xc = 9 Q and is supplied with 200 V, 50 Hz.Calculate the power. |
| A. | 6400 W |
| B. | 8000 W |
| C. | 14,400 W |
| D. | 19,200 W |
| Answer» B. 8000 W | |
| 16. |
The AC bridge used for measurement of dielectric loss of capacitor is |
| A. | andersion bridge |
| B. | schering bridge |
| C. | wien bridge |
| D. | hay's bridge |
| Answer» C. wien bridge | |
| 17. |
a supply voltage of 230 V, 50 Hz is fed to a residental building. write down its equation for instantaneous value. |
| A. | 163 sin 314.16 t |
| B. | 230 sin 314.16 t |
| C. | 325 sin 314.16 t |
| D. | 361 sin 314.16 t |
| Answer» D. 361 sin 314.16 t | |
| 18. |
in an R-L series circuit, the phase difference between applied voltage and circuit current will increase if |
| A. | XL is increased |
| B. | R is increased |
| C. | XL is decreased |
| D. | supply frequency is decreased |
| Answer» B. R is increased | |
| 19. |
a current of 5 mA flows in a resistanceless choke from a 200 v alternating source. the energy consumed in the choke is |
| A. | 0 J |
| B. | 44 J |
| C. | 500 J |
| D. | 1000 J |
| Answer» B. 44 J | |
| 20. |
The magnetic material used in permanent magnets is |
| A. | iron |
| B. | soft steel |
| C. | nickel |
| D. | hardened steel |
| Answer» E. | |
| 21. |
the main advantage of temporary magnets is that we can |
| A. | change the manetic flux |
| B. | use any magnetic material |
| C. | decrease the hysteresis loss |
| D. | magnetize without any source |
| Answer» B. use any magnetic material | |
| 22. |
Magnetic lines of force coming from a magnet |
| A. | intersect at infinity |
| B. | intersect within the magnet |
| C. | cannot intersect at all |
| D. | cancel at pole faces |
| Answer» D. cancel at pole faces | |
| 23. |
The B-H curve for________will be a straight line passing through the origin. |
| A. | air |
| B. | soft iron |
| C. | hardened steel |
| D. | silicon steel |
| Answer» B. soft iron | |
| 24. |
A circuit has inductance of 2 H. If the circuit current changes at the rate of 10 A/sec, then self-induced emf is |
| A. | 5 V |
| B. | 0.2 V |
| C. | 20 V |
| D. | 10V |
| Answer» D. 10V | |
| 25. |
the flux through each turn of a 100-turn coil is(t³-2t)mWh,where 't' is in seconds.find the magnitude of the induced emf at t=2s |
| A. | 1 V |
| B. | 0.8 V |
| C. | 0.4 V |
| D. | 0.2 V |
| Answer» B. 0.8 V | |
| 26. |
hysteresis is the phenomenon in the magnetic cicuit by which |
| A. | H lags behind B |
| B. | B lags behind H |
| C. | B and H are always same |
| D. | setting up a constant flux is done |
| Answer» C. B and H are always same | |
| 27. |
A coil with a certain number of turns has a specified time constant.If the number of turns is doubled, its time constant would |
| A. | remain unaffected |
| B. | become double |
| C. | become four-fold |
| D. | get halved |
| Answer» C. become four-fold | |
| 28. |
Energy stored in an inductor is given by |
| A. | 1/v2(LI)² |
| B. | 1/2 L²I |
| C. | 1/vLI |
| D. | 1/2 LI² |
| Answer» E. | |
| 29. |
The north pole of a magnet is moved away from a metallic ring. The induced current in the ring flows |
| A. | clockwise |
| B. | anticlockwise |
| C. | first anticlockwise and then clockwise |
| D. | first clockwise and then anticlockwise |
| Answer» C. first anticlockwise and then clockwise | |
| 30. |
Four resistances 2 Ω, 4 Ω, 5 Ω, 20 Ω are connected in parallel.Their combined resistance is |
| A. | 1 Ω |
| B. | 2 Ω |
| C. | 4 Ω |
| D. | 5 Ω |
| Answer» B. 2 Ω | |
| 31. |
A 200 W, 200 V bulb and a 100 W, 200 V bulb are connected in series and the voltage of 400 V is applied across the series connected bulbs. Under this condition |
| A. | 100 W bulb will be brighter than 200 W bulb |
| B. | 200 W bulb will be brighter than 100 W bulb |
| C. | Both the bulbs will haveequal brightness |
| D. | Both the bulbs will be darker than when they are connected across rated voltage |
| Answer» B. 200 W bulb will be brighter than 100 W bulb | |
| 32. |
The unit of volume resistivity is |
| A. | ohm-m3/m2 |
| B. | ohm-m2/m |
| C. | ohm-gram-m/gram |
| D. | ohm-m4/m3 |
| Answer» B. ohm-m2/m | |
| 33. |
Tesla is same as |
| A. | Weber/meter |
| B. | Weber/(meter)² |
| C. | Farad/meter |
| D. | Henry/(meter)² |
| Answer» C. Farad/meter | |
| 34. |
a peice of oil soaked paper has been inserted between the parallel plate capacitor.then the potential difference between the plates will |
| A. | increase |
| B. | decrease |
| C. | remain unaltered |
| D. | become zero |
| Answer» C. remain unaltered | |
| 35. |
Kannan is the brother of Kumar. Lakshmi is the daughter of Kumar. Kalai is sister of Kannan and Goving is the brother of Lakshmi. Who is the uncle of Govind ? |
| A. | Kumar |
| B. | Kalai |
| C. | Lakshmi |
| D. | Kannan |
| Answer» E. | |
| 36. |
the current drawn by a tungusten filament lamp is measured by an ammeter the ammeter reading under steady state condition will be_________the ammeter reading when the supply is switched on. |
| A. | same as |
| B. | less than |
| C. | greater than |
| D. | double |
| Answer» C. greater than | |
| 37. |
A stove element draws 15 A when connected to 230 V line. How long does it take to consume one unit of energy ? |
| A. | 3.45 h |
| B. | 2.16 h |
| C. | 1.0 h |
| D. | 0.29 h |
| Answer» E. | |
| 38. |
The total number of students in class A and class B is 120. If 15 students from class A are taken and added to class B, the number in class B becomes twice that of A. Find out the number of students in class A in the beginning. |
| A. | 80 |
| B. | 65 |
| C. | 55 |
| D. | 40 |
| Answer» D. 40 | |
| 39. |
Find out the pair of numbers that do not belongs to the group for each of common property. |
| A. | 144----81 |
| B. | 169-----------600 |
| C. | 196---------121 |
| D. | 100-----------225 |
| Answer» C. 196---------121 | |
| 40. |
In the questions given below, select the missing number/letter from the given responses.Question:17, 19, 23, 29, ? |
| A. | 33 |
| B. | 35 |
| C. | 31 |
| D. | 39 |
| Answer» D. 39 | |
| 41. |
In the questions given below, select the missing number/letter from the given responses.Question: 49--------100----------649-----------36-----------481-----------1-----------2519-----------?-----------15 |
| A. | 14 |
| B. | 16 |
| C. | 17 |
| D. | 18 |
| Answer» D. 18 | |
| 42. |
In the questions given below, select the missing number/letter from the given responses.Question:E-----------G-------------IR----------U--------------XJ----------N---------------? |
| A. | P |
| B. | R |
| C. | O |
| D. | Q |
| Answer» C. O | |
| 43. |
In the questions given below, select the missing number/letter from the given responses.Question:?-------------921-----------13 |
| A. | 49 |
| B. | 37 |
| C. | 64 |
| D. | 63 |
| Answer» C. 64 | |
| 44. |
In the questions given below, select the missing number/letter from the given responses.Question:23, 24,27, 28, 31, 32, ? |
| A. | 30 |
| B. | 33 |
| C. | 29 |
| D. | 35 |
| Answer» E. | |
| 45. |
Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it ?i_b_ub_ubt_blu_tub |
| A. | ubtiu |
| B. | utlub |
| C. | tulbu |
| D. | butlu |
| Answer» C. tulbu | |
| 46. |
In the questions given below, a series is given, with one number/letter missing. Choose the correct alternative from the given ones that will complete the series.Question: 15, 39, 74, 122, ?, 265 |
| A. | 151 |
| B. | 165 |
| C. | 171 |
| D. | 185 |
| Answer» E. | |
| 47. |
In the questions given below, a series is given, with one number/letter missing. Choose the correct alternative from the given ones that will complete the series.Question: ELFA, GLHA, ILJA, ? MLNA |
| A. | OLPA |
| B. | KLMA |
| C. | LLMA |
| D. | KLLA |
| Answer» E. | |
| 48. |
In the questions given below, which one of the given responses would be a meaningful order of the following .Question: 1. Flower 2. Seed 3. Plant 4. Fruits 5. Branches 6. Tree |
| A. | 2, 3, 6, 5, 1, 4 |
| B. | 2, 6, 3, 1, 4, 5 |
| C. | 2, 1, 4, 6, 5, 3 |
| D. | 2, 1, 3, 6, 5, 4 |
| Answer» B. 2, 6, 3, 1, 4, 5 | |
| 49. |
In the questions given below, which one of the given responses would be a meaningful order of the following .Question: 1. Wrist 2. Arm 3. Shoulder 4. Finger 5. Palm 6. Nail |
| A. | 6, 4, 5, 2, 1, 3 |
| B. | 3, 2, 5, 1, 4, 6 |
| C. | 5, 4, 6, 1, 2, 3 |
| D. | 3, 2, 1, 5, 4, 6 |
| Answer» E. | |
| 50. |
In the questions given below, select the one which is different from the other three responses. |
| A. | Petrol |
| B. | Diesel |
| C. | Kerosene |
| D. | LPG |
| Answer» E. | |