42.

43.

44.

45.

46.

47.

48.

Armature of a DC machine is made of
(A) conducting material (B) insulating material

(C) non-ferrous material (D) silicon steel

Which DC motor has got maximum self loading property?
(A) shunt motor

(B) series motor

(C) differentially compounded motor

(D) cumulatively compounded motor

When a DC series motor is connected to an AC supply, then
(.... See more

125/23

85.

86.

87.

88.

89.

90.

91.

Which of the following statements related to Servo motor is incorrect ?
A) Provides high levels of torque at highspeed

B
0
D

It is inexpensive and widely available

)
)
) Servo motor can work in AC or DC

) It can be operated at 80-90% efficiency

Large number of narrow slots in stator of an AC motor is preferred because

See more

D:-Shorted
Correct Answer:- Option-B
Question29:-Among them which motor has highest starting torque
A:-Shaded pole motor
B:-Universal motor
C:-Capacitor start induction run motor
D:-Permanent capacitor motor
Correct Answer:- Option-B

Question30:-The cells of 2 volt and each having an internal resistance of 0.2 Q are jointed in series. If 10 Q external
resistance is connected accross the circuit, what will be the current flowing through the

D:-1.6.... See more

78. How the speed control of universal motor used for sewing machine is done?
(A) Introducing friction mechanism
(B) Tapping the field at various point
(0 Centrifugal mechanism
(1)) Introducing a variable resistance in series with the ‏تد‎ 5۳
74. Buchholz relay is operated by :
(ക) 688 pressure (B) Eddy current
(ര Blectrostatic induction (D) Electromagnetic induction
75. The size of earth wire is determined by :
(A) the atmospheric condition
(B).... See more

10.

11

12.

13.

14.

15.

A constant speed motor is ;
(ക Synchronous motor (B) Squirrel cage IM
(0 Universal motor (D) Slip ring IM

The highest transmission volage in Kerala:
(ക) 500 2 (B) 400 KV
(C) 220KV (௩) 110 KV

When the lead acid cell is fully discharged the anode becomes?

ക ೫050, (8) Pb

0 ೫00% (D) ೭00
The resistance of a wire is 2 chm. If the diameter of the ಕ is redu.... See more

52.

53.

54.

55.

86.

57.

58.

59.

60.

In which type of DC Motor, Two point starter 15 used?
(A) Series motor (B) Shunt motor

(0) Long shunt compound motor (D) Short shunt compound motor

What is the SWG of copper earth conductor if the maximum circuit current is 15?
മു No.14 ೫ No.10
000 (D) No.8

What is the effect of single phasing in three phase induction motor?<.... See more

D:-Shorted
Correct Answer:- Option-B
Question29:-Among them which motor has highest starting torque
A:-Shaded pole motor
B:-Universal motor
C:-Capacitor start induction run motor
D:-Permanent capacitor motor
Correct Answer:- Option-B
Question30:-The cells of 2 volt and each having an intemal resistance of 0.2 Q are jointed in series. If 10 Q external
resistance is connected accross the circuit, what will be the current flowing through the
A:-1.5A
B:-1..... See more

D:-Shorted
Correct Answer:- Option-B
Question29:-Among them which motor has highest starting torque
A:-Shaded pole motor
B:-Universal motor
C:-Capacitor start induction run motor
D:-Permanent capacitor motor
Correct Answer:- Option-B
Question30:-The cells of 2 volt and each having an intemal resistance of 0.2 Q are jointed in series. If 10 Q external
resistance is connected accross the circuit, what will be the current flowing through the
A:-1.5A
B:-1..... See more

41.

42.

43.

44.

45.

46.

47.

48.

49.

030/2020

From the following power plants which one has the least operating cost ?
A) Hydro-electric B) Solar
C) Thermal D) Nuclear

In DC shunt motor what is the relation between speed, flux and back EMF ?

A) ‏معلا @ )8 جج۷‎
©) (भः ഉ) Eb » oN

The maximum permissible voltage drop in a 240 V network is 30%. What is th.... See more

10.

11.

12.

13.

14.

15.

16.

What is the pressure Inside the Acetylene cylinder?
(^) 120-150 kg/cm? (B) 80-100 kg/cm?
(0) 15-16 kg/cm? (D) 18-36 kg/cm?

The Ammeter is used in :
(A) combination of series and parallel circuit
൯ inearth wire
(C) parallel connection

(D) 8€1168 connection

The same current passes through each resistance ina:
(A) _ parallel circuit
(8). series circui.... See more

C:-Frequency is equal to resonance frequency
D:-Frequency is zero
Correct Answer:- Option-A

Question17:-If the maximum value of dynamically induced emf produced in a
conductor a DC generator is 100V, then what will be the value of induced emf when
the conductor cuts the magnetic field at 30°?

A:-50 Volts

B:-100 Volts

C:-30 Volts

D:-86 Volts

Correct Answer:- Option-A

Question18:-What is the formula used to calculate t.... See more

52.

53.

54.

85.

86.

57.

൫8.

60.

The direction of rotation of a DC motor is determined by :

(^) Fleming's right hand rule (18 Fleming's left hand rule

(C) Right hand grip rule (10) Maxwell's cork screw rule
The back e.m.f. of a D.C motor depends on :

(ಗಿ) Shape of conductors (B) Field flux

(0) Type of commutator (D) Brush material

The main function of starter of the DC Mo.... See more

61. When a 3 phase induction motor is switched to star position through a star delta starter :
(A) 8 times the torque produced than the delta position
(B) 3 times torque produced than the delta position

(0) ಇ times the torque produced than the delta position

™ times torque produced than the delta position

62. In a manual star delta starter, the stop button connection is in series with the :
(A) No volt coil
(B) Over load relay contact
(¢) No vo.... See more

10, The crawling in an induction motor is caused by :

(5) improper design of the machine (8) low voltage supply

(C) high load (D) harmonics developed in the motor
11, The commutator segments are placed in :

(வி rotor (ए) stator (3) armature )©( 084
12. Reduction in the capacitance of capacitor start motor results in reduced :

(A} noise (B} starting torque

(C) speed (D) armature reaction
13. In an ac circuit the ratio of KW/kVA repre.... See more

88,

89.

60.

61.

62.

68.

64.

65.

The inductance of a long solenoid is measured as 1 mH. What will be its inductance, if the
number of turns is doubled?

(4) 1mH 0) 4mH

(0 05mH D) 2mH

The energy stored in the magnetic field of a salenoid carrying a current of 10 A is 0.5 J, What
will be the stored energy if the number of turns is doubled and the current is halved?

A 14 8 89

(.... See more

69.

71.

79.

74.

75,

76.

What will be the load power factor, if one waltmeter read positive and the other zero in a
two wattmeter method for power measurement ?

(ಗಿ) पणा (18) 2616 (ಲ) 05 lag (D) 05 lead

A dynamometer moving coil instrument can measure :
(ಗಿ) ac only (B) d.c. only
(C) both acand १.६. (D) only pulsating quantities

Which of the following bridge rectifiers has highest harm.... See more

65.

66.

۔67

68.

69.

70.

71.

12:

A

Which of the following is the most popular DAC?
(^) R - 2R ladder type (03) weighted - resister type
(C) switched - current source type (10) swilched — capacitor type

The sequential circuit in which the output depends only on the present state of flip-flops is

called a ——— cireuit.
) ‏۷٣۳‎ ⋅ (0) ೫1೧೧
(~) तावन्त), .... See more

31.

32.

33.

34.

35.

36.

87.

38.

CRGO laminations in a transformer are used to minimise :

(ക) ‏براه‎ current loss (B) hysteresis [055
)0 0011 (ಗಿ) and (B) (D) 001800 1085
An Air-core transformer, as compared to iron core transformer, has +
(^) less magnetic core loss (B) more magnetic core 1088
(0 no magnetic core loss (D) less ohmic loss

Transformer maximum efficiency, for a co.... See more

۸:٤
‎D:-Very low‏
‎Correct Answer:- Option-C‏
‎Question39:-in core type transformers the number of flux paths are‏
2ھ
‎B:-more than 2‏
‎C:-Half of the path‏
‎D:-single‏
‎Correct Answer:- Option-D‏
‎Question40:-The relation between the excitation current and magnetic flux of a transformer is‏
‎A:-Current leads flux‏
‎B:-Flux leads the current‏
‎C:-They are in phase‏
‎D:-None of the above‏
�.... See more

61.

62.

63.

64.

65.

66.

67.

68.

69.

70.

71.

032/2020

In 0.0. machine the yoke is made of
A) Cast steel
C) Silicon steel

B) Soft iron
D) None of the above

The armature of a d.c. machine is laminated in order to reduce
A) Copper loss B) Eddy current loss
C) Hysteresis loss D) Frictional loss

In 6.0. machine the armature winding is placed on roto.... See more

030/2020

50.

51.

52.

53.

54.

55.

In 5.1. System what will be the unit of Torque of DC motor ?
A) Newton-meter

B) Joule

C) Newton-centimeter

0) Kilogram-meter

What is the purpose of bedding in an underground cable ?

A) To increase the conductivity of the cable

B) To protect the metallic sheath from mechanical injury from armoring
C) To hold the insulators on which conductor.... See more

030/2020

62.

63.

64.

65.

66.

67.

During rheostat breaking of DC series motors
A) Motor is reversed in direction

B) Motor is run as a generator

C) Motor is run at high speed

D) Motor is run at reduced speed

ACSR conductors could be joined by using
A) Oval shaped sleeves

B) Straight sleeve and nut connector

C) Compression sleeves

D) Universal P.G. clamp

How.... See more

030/2020

75.

76.

77.

78.

79.

80.

is the factor which least affects the sag of a transmission line.
) Weight of the conductor
) Current through the conductor
C) Atmospheric temperature
) 106 deposition on the conductor

What is the purpose to conduct blocked rotor test in 8 three phase induction motor ?
A) To determine the full load copper loss

B) To determine the mechanical and iron loss

.... See more

098/23

25.

26.

27.

28.

29.

30.

If the applied voltage of a certain transformer is increased by 50% and the frequency
is reduced to 50% the maximum core flux density at secondary side will be

A) Bn B) 23൩
0) 1.5871 0) 3871

A 3 phase 16 pole alternator has 144 slots, then the distribution factor in the machine is
A) 0.959 B) 0.84
C) 0.8 D) 1

The eddy current loss of a transformer at 150 V, 6.... See more

Question65:-A 4 pole three phase induction motor operates from 440 V, 50 Hz
supply. At 4% slip, the speed of the motor is

A:-1500 rpm

B:-1400 rpm

C:-1440 rpm

D:-None of the above
Correct Answer:- Option-C

Question66:-The rotor resistance and leakage reactance of an induction motor is ௩,
and x, respectively. If the stator impedance is neglected, the maximum torque of an
induction motor occurs at a slip of

A:-Slip = 2 / X2
See more

D:-Becomes two times of their former value
Correct Answer:- Option-C
Question34:-Brushes of a DC generator are always placed along the
A:-Geometric neutral axis
B:-Magnetic neutral axis
C:-Perpendicular to GNA
D:-Perpendicular to MNA
Correct Answer:- Option-B
Question35:-Which type of motor is used in elevators?
A:-Differentially compound motor
B:-Cumulatively compound motor
C:-Series motor
D:-Shunt motor
Correct Answer:- Option-B
Question3.... See more