ELECTRICAL ENGINEERING- PAGE 11
ELECTRICAL ENGINEERING MCQs- PAGE 11
1. In steam locomotive, electric power is provided through
(a) Battery system (b) Diesel engine generator (c) Overhead wire (d) Small turbo generator
Ans: D
2. Which of the following methods of heating is not dependent on the frequency of supply ?
(a) Induction heating (b) Dielectric heating (c) Electric Resistance heating (d) All of the above
Ans: C
3. A single-phase AC arc welding transformer supplies approximately
(a) 100 volts at 0.35 power factor (b) 60 volts at 0.35 power factor (c) 220 volts at 0.8 power factor (d) 100 volts at 0.6 power factor
Ans: A
4. Long distance railways use for their electric traction
(a) 200 V dc (b) 25 kV single phase ac (c) 25 kV two phase ac (d) 25 kV three phase ac
Ans: B
5. Which type of motor is used for elevators ?
(a) Synchronous motor (b) Inductor motor (c) Split phase motor (d) All of the above
Ans: B
6. Minimum wind speed required for generating electricity in a wind mill is
(a) 15 m/hour (b) 1 km/hour (c) 15 km/hour (d) None of the above
Ans: C
7. The rotor of a stepper motor has no
(a) Winding (b) Commutator (c) Brushes (d) All of the above
Ans: D
8. A synchronous motor is essentially a motor with
(a) Constant speed (b) Leading power factor (c) Unity power factor (d) Lagging power factor
Ans: A
9. The insulating fluids that are commonly used in circuit breakers is/are
(a) SF6 (b) Air at atmospheric pressure (c) Compressed air (d) All of the above
Ans: D
10. At low values of slip, the torque of an induction motor is
(a) directly proportional to the square of the slip. (b) inversely proportional to the square of the slip.
(c) directly proportional to the slip. (d) inversely proportional to the slip.
Ans: C
11. An infinite bus-bar has
(a) constant voltage (b) constant frequency (c) infinite voltage (d) both (a) and (b)
Ans: D
12. If the supply frequency of a 3-phase induction motor is ‘f’, then frequency of rotor emf at motor slip ‘s’ will be
(a) sf (b) (1 – s)f (c) f/s (d) None of these
Ans: A
13. If a four pole synchronous generator driven at 1500 rpm feeds a 6-pole induction motor, which is loaded to run at a slip of 5%, then speed of the motor will be
(a) 1000 rpm (b) 950 rpm (c) 1500 rpm (d) 1450 rpm
Ans: B
14. Which of the following vapour/gas will give yellow colour ?
(a) Helium (b) Mercury (c) Sodium (d) Magnesium
Ans: C
15. If the distance between the light source and the surface is reduced to half, the illumination on the surface will
(a) reduce to half of the original. (b) reduce to one fourth of the original.
(c) increase to double of the original. (d) increase to four times of the original.
Ans: D
16. 80% Ni, 20% Cr is called as
(a) Constantan (b) Nichrome (c) Kanthal (d) None of these
Ans: B
(a) Battery system (b) Diesel engine generator (c) Overhead wire (d) Small turbo generator
Ans: D
2. Which of the following methods of heating is not dependent on the frequency of supply ?
(a) Induction heating (b) Dielectric heating (c) Electric Resistance heating (d) All of the above
Ans: C
3. A single-phase AC arc welding transformer supplies approximately
(a) 100 volts at 0.35 power factor (b) 60 volts at 0.35 power factor (c) 220 volts at 0.8 power factor (d) 100 volts at 0.6 power factor
Ans: A
4. Long distance railways use for their electric traction
(a) 200 V dc (b) 25 kV single phase ac (c) 25 kV two phase ac (d) 25 kV three phase ac
Ans: B
5. Which type of motor is used for elevators ?
(a) Synchronous motor (b) Inductor motor (c) Split phase motor (d) All of the above
Ans: B
6. Minimum wind speed required for generating electricity in a wind mill is
(a) 15 m/hour (b) 1 km/hour (c) 15 km/hour (d) None of the above
Ans: C
7. The rotor of a stepper motor has no
(a) Winding (b) Commutator (c) Brushes (d) All of the above
Ans: D
8. A synchronous motor is essentially a motor with
(a) Constant speed (b) Leading power factor (c) Unity power factor (d) Lagging power factor
Ans: A
9. The insulating fluids that are commonly used in circuit breakers is/are
(a) SF6 (b) Air at atmospheric pressure (c) Compressed air (d) All of the above
Ans: D
10. At low values of slip, the torque of an induction motor is
(a) directly proportional to the square of the slip. (b) inversely proportional to the square of the slip.
(c) directly proportional to the slip. (d) inversely proportional to the slip.
Ans: C
11. An infinite bus-bar has
(a) constant voltage (b) constant frequency (c) infinite voltage (d) both (a) and (b)
Ans: D
12. If the supply frequency of a 3-phase induction motor is ‘f’, then frequency of rotor emf at motor slip ‘s’ will be
(a) sf (b) (1 – s)f (c) f/s (d) None of these
Ans: A
13. If a four pole synchronous generator driven at 1500 rpm feeds a 6-pole induction motor, which is loaded to run at a slip of 5%, then speed of the motor will be
(a) 1000 rpm (b) 950 rpm (c) 1500 rpm (d) 1450 rpm
Ans: B
14. Which of the following vapour/gas will give yellow colour ?
(a) Helium (b) Mercury (c) Sodium (d) Magnesium
Ans: C
15. If the distance between the light source and the surface is reduced to half, the illumination on the surface will
(a) reduce to half of the original. (b) reduce to one fourth of the original.
(c) increase to double of the original. (d) increase to four times of the original.
Ans: D
16. 80% Ni, 20% Cr is called as
(a) Constantan (b) Nichrome (c) Kanthal (d) None of these
Ans: B
17. The PLC was invented by
(a) Bill Gates (b) Dick Morley (c) Bill Landis (d) Tod Cunningham
Ans: B
18. Match the Lists L-I and L-II. L – I L – II 1. Bolometer A. Flow 2. H-Bridge B. Displacement 3. LVDT C. Radiation 4. Anemometer D. DC Motor 1 2 3 4
(a) C D B A (b) D C A B (c) A C B D (d) D C B A
Ans: A
19. Which meter is suitable for the measurement of 10 mV at 50 MHz ?
(a) Moving iron voltmeter (b) CRO (c) Electrostatic voltmeter (d) VTVM
Ans: B
20. Programmable Logical controllers are the devices that were invented basically to replace
(a) Switches (b) Circuit Breakers (c) Relays (d) None of the above
Ans: C
21. Load cell essentially is a
(a) Thermistor (b) Strain gauge (c) Photo-voltaic cell (d) None of these
Ans: B
22. Stranded wires are mainly used to
(a) reduce skin effect (b) reduce metal fatigue (c) reduce proximity effect (d) both (b) and (c)
Ans: D
(a) Bill Gates (b) Dick Morley (c) Bill Landis (d) Tod Cunningham
Ans: B
18. Match the Lists L-I and L-II. L – I L – II 1. Bolometer A. Flow 2. H-Bridge B. Displacement 3. LVDT C. Radiation 4. Anemometer D. DC Motor 1 2 3 4
(a) C D B A (b) D C A B (c) A C B D (d) D C B A
Ans: A
19. Which meter is suitable for the measurement of 10 mV at 50 MHz ?
(a) Moving iron voltmeter (b) CRO (c) Electrostatic voltmeter (d) VTVM
Ans: B
20. Programmable Logical controllers are the devices that were invented basically to replace
(a) Switches (b) Circuit Breakers (c) Relays (d) None of the above
Ans: C
21. Load cell essentially is a
(a) Thermistor (b) Strain gauge (c) Photo-voltaic cell (d) None of these
Ans: B
22. Stranded wires are mainly used to
(a) reduce skin effect (b) reduce metal fatigue (c) reduce proximity effect (d) both (b) and (c)
Ans: D
23. A large size synchronous generator is protected against overloads by
(a) over current relay (b) mho relay (c) temperature sensitive relay (d) Buchholz relay
Ans: C
24. Earth resistance comprises of A. Resistance of soil away from electrode. B. Contact resistance between electrode and soil. C. Resistance of metal electrode
(a) A only (b) A and B only (c) A and C only (d) A, B and C together
Ans: D
25. When cathode is positive with respect to anode in an SCR, the number of blocked p-n junctions is
(a) 1 (b) 2 (c) 3 (d) 4
Ans: B
26. If a forward voltage (less than forward breakover voltage) is suddenly applied across anode and cathode of a thyristor, it may result into
(a) Damage to the thyristor (b) Premature triggering of the thyristor because of high dV/dt
(c) Reduced holding current of the thyristor (d) All of the above
Ans: B
27. In a thyristor d.c. chopper, which type of commutation results in best performance ?
(a) Voltage commutation (b) Current commutation (c) Load commutation (d) Supply commutation
Ans: C
28. The power supply whose output voltage varies with variation in input voltage or output load current is known as
(a) Regulated Power Supply (b) Unregulated Power Supply (c) Uninterruptible Power Supply (d) Switched Mode Power Supply
Ans: B
29. For an SCR, dV/dt protection is achieved by the use of
(a) RL in series with SCR (b) L in series with SCR (c) RC in series with SCR (d) RC across SCR
Ans: D
30. Which of the following motors is used in household refrigerators ?
(a) AC series motor (b) DC shunt motor (c) Reluctance motor (d) Single phase induction motor
Ans: D
31. The method suitable for heating of a conducting medium is
(a) Induction heating (b) Indirect arc heating (c) Eddy current heating (d) Resistance heating
Ans: A
32. A power plant has to supply loads as follows : 12 pm to 5 am = 500 kW; 2 pm to 5 pm = 2500 kW 5 am to 10 am = 800 kW; 5 pm to 8 pm = 2000 kW 10 am to 12 noon = 2000 kW; 8 pm to 10 pm = 1500 kW 12 noon to 2 pm = 1000 kW; 10 pm to 12 pm = 1000 kW Total units during 24 hours and load factor will be respectively
(a) 51.66 units, 31% (b) 31k units, 51.66% (c) 31k units, 33% (d) None of the above
Ans: B
33. SMPS are superior to linear power supplies in respect of
(a) size and efficiency (b) efficiency and regulation (c) regulation and noise (d) noise and cost
Ans: A
34. Differential relays are used for the protection of equipments against
(a) Internal faults (b) Over current (c) Reverse current (d) Reverse power
Ans: A
35. A 3-phase circuit breaker is rated at 1250 A, 2000 MVA, 33 kV, 4s. Its making current capacity will be
(a) 35 kA (b) 89 kA (c) 79 kA (d) 69 kA
Ans: B
36. Main function of the fuse is to
(a) Protect the line (b) Open the circuit (c) Protect the appliance (d) Prevent excessive current
Ans: D
37. Distribution voltage levels in India are
(a) 11 kV, 400 V, 3 φ (b) 33 kV, 11 kV, 3 φ (c) 220 kV, 11 kV, 3 φ (d) None of the above
Ans: A
38. By burden on the relay, we generally mean
(a) Current rating of relay (b) Voltage rating of relay (c) Volt-ampere rating of relay (d) Watt rating of relay
Ans: C
39. In a static over-current relay, inverse time characteristics are obtained by
(a) A differentiating circuit (b) An integrating circuit (c) A transistor amplifier (d) A transistor switch
Ans: B
40. Main purpose of oil in OCB is to
(a) provide insulation (b) provide cooling of contacts (c) quenching arc (d) None of the above
Ans: C
41. Which of the following circuit breaker is generally used in railway electrification ?
(a) Air Blast circuit breaker (b) Minimum Oil circuit breaker (c) Bulk Oil circuit breaker (d) SF6 circuit breaker
Ans: A
42. Aluminium conductor cables can be joined by
(a) Gas welding (b) Soldering (c) Compression (d) Thermit welding
Ans: C
43. From the point of view of safety, the resistance of earthing electrode should be
(a) Low (b) High (c) Medium (d) The value of resistance of earth does not affect the safety
Ans: A
44. Electric arc welding process produces temperature upto
(a) 1000 °C (b) 1500 °C (c) 3500 °C (d) 5550 °C
Ans: D
45. During the resistance welding heat produced at the joint is proportional to
(a) I2R (b) kVA (c) Current (d) Voltage
Ans: A
46. At atmospheric pressure, the dielectric strength of SF6 is about
(a) 2.5 times of air (b) 2.5 times of oil (c) 2.5 times of vacuum (d) None of the above
Ans: A
47. Mho relay is
(a) current restrained current relay. (b) voltage restrained directional relay.
(c) current restrained directional relay. (d) voltage restrained current relay.
Ans: B
48:-Edison screw type lamp holders are used for lamp with _________ wattage range.
A:-above 600 w B:-upto 200 w C:-above 200 w below 600 w D:-above 200 w below 300 w
Ans: D
49:-To increase the ampere hour rating, the cells are to be connected in
A:-parallel B:-series parallel C:-parallel series D:-series
Ans: A
50:-"Don't try to stop a running machine with hands" comes under
A:-General safety B:-Personal safety C:-Machine safety D:-Social safety
Ans: B
(a) over current relay (b) mho relay (c) temperature sensitive relay (d) Buchholz relay
Ans: C
24. Earth resistance comprises of A. Resistance of soil away from electrode. B. Contact resistance between electrode and soil. C. Resistance of metal electrode
(a) A only (b) A and B only (c) A and C only (d) A, B and C together
Ans: D
25. When cathode is positive with respect to anode in an SCR, the number of blocked p-n junctions is
(a) 1 (b) 2 (c) 3 (d) 4
Ans: B
26. If a forward voltage (less than forward breakover voltage) is suddenly applied across anode and cathode of a thyristor, it may result into
(a) Damage to the thyristor (b) Premature triggering of the thyristor because of high dV/dt
(c) Reduced holding current of the thyristor (d) All of the above
Ans: B
27. In a thyristor d.c. chopper, which type of commutation results in best performance ?
(a) Voltage commutation (b) Current commutation (c) Load commutation (d) Supply commutation
Ans: C
28. The power supply whose output voltage varies with variation in input voltage or output load current is known as
(a) Regulated Power Supply (b) Unregulated Power Supply (c) Uninterruptible Power Supply (d) Switched Mode Power Supply
Ans: B
29. For an SCR, dV/dt protection is achieved by the use of
(a) RL in series with SCR (b) L in series with SCR (c) RC in series with SCR (d) RC across SCR
Ans: D
30. Which of the following motors is used in household refrigerators ?
(a) AC series motor (b) DC shunt motor (c) Reluctance motor (d) Single phase induction motor
Ans: D
31. The method suitable for heating of a conducting medium is
(a) Induction heating (b) Indirect arc heating (c) Eddy current heating (d) Resistance heating
Ans: A
32. A power plant has to supply loads as follows : 12 pm to 5 am = 500 kW; 2 pm to 5 pm = 2500 kW 5 am to 10 am = 800 kW; 5 pm to 8 pm = 2000 kW 10 am to 12 noon = 2000 kW; 8 pm to 10 pm = 1500 kW 12 noon to 2 pm = 1000 kW; 10 pm to 12 pm = 1000 kW Total units during 24 hours and load factor will be respectively
(a) 51.66 units, 31% (b) 31k units, 51.66% (c) 31k units, 33% (d) None of the above
Ans: B
33. SMPS are superior to linear power supplies in respect of
(a) size and efficiency (b) efficiency and regulation (c) regulation and noise (d) noise and cost
Ans: A
34. Differential relays are used for the protection of equipments against
(a) Internal faults (b) Over current (c) Reverse current (d) Reverse power
Ans: A
35. A 3-phase circuit breaker is rated at 1250 A, 2000 MVA, 33 kV, 4s. Its making current capacity will be
(a) 35 kA (b) 89 kA (c) 79 kA (d) 69 kA
Ans: B
36. Main function of the fuse is to
(a) Protect the line (b) Open the circuit (c) Protect the appliance (d) Prevent excessive current
Ans: D
37. Distribution voltage levels in India are
(a) 11 kV, 400 V, 3 φ (b) 33 kV, 11 kV, 3 φ (c) 220 kV, 11 kV, 3 φ (d) None of the above
Ans: A
38. By burden on the relay, we generally mean
(a) Current rating of relay (b) Voltage rating of relay (c) Volt-ampere rating of relay (d) Watt rating of relay
Ans: C
39. In a static over-current relay, inverse time characteristics are obtained by
(a) A differentiating circuit (b) An integrating circuit (c) A transistor amplifier (d) A transistor switch
Ans: B
40. Main purpose of oil in OCB is to
(a) provide insulation (b) provide cooling of contacts (c) quenching arc (d) None of the above
Ans: C
41. Which of the following circuit breaker is generally used in railway electrification ?
(a) Air Blast circuit breaker (b) Minimum Oil circuit breaker (c) Bulk Oil circuit breaker (d) SF6 circuit breaker
Ans: A
42. Aluminium conductor cables can be joined by
(a) Gas welding (b) Soldering (c) Compression (d) Thermit welding
Ans: C
43. From the point of view of safety, the resistance of earthing electrode should be
(a) Low (b) High (c) Medium (d) The value of resistance of earth does not affect the safety
Ans: A
44. Electric arc welding process produces temperature upto
(a) 1000 °C (b) 1500 °C (c) 3500 °C (d) 5550 °C
Ans: D
45. During the resistance welding heat produced at the joint is proportional to
(a) I2R (b) kVA (c) Current (d) Voltage
Ans: A
46. At atmospheric pressure, the dielectric strength of SF6 is about
(a) 2.5 times of air (b) 2.5 times of oil (c) 2.5 times of vacuum (d) None of the above
Ans: A
47. Mho relay is
(a) current restrained current relay. (b) voltage restrained directional relay.
(c) current restrained directional relay. (d) voltage restrained current relay.
Ans: B
48:-Edison screw type lamp holders are used for lamp with _________ wattage range.
A:-above 600 w B:-upto 200 w C:-above 200 w below 600 w D:-above 200 w below 300 w
Ans: D
49:-To increase the ampere hour rating, the cells are to be connected in
A:-parallel B:-series parallel C:-parallel series D:-series
Ans: A
50:-"Don't try to stop a running machine with hands" comes under
A:-General safety B:-Personal safety C:-Machine safety D:-Social safety
Ans: B
51:-The ripple factor of a power supply is a measure of
A:-Its voltage regulation
B:-Diode rating
C:-Its filter efficiency
D:-Purity of power output
Ans: D
52:-The function of a commutator in a DC generator is
A:-To change DC to AC
B:-To collect current from conductors
C:-To change AC to DC
D:-To conduct the current to the brushes
Ans: C
53:-The field coils of a DC generator are usually made of
A:-Carbon
B:-Copper
C:-Cast iron
D:-Graphite
Ans: B
54:-In a two point starters the series resistors is required for
A:-To limit the starting current
B:-Starting the motor
C:-To limit the back emf
D:-To give heavy current at starting
Ans: A
55:-In two watt meter method of measuring three phase power one of the wattmeter shows zero reading what would be the value of the power factor in this case
A:-1
B:-0.5
C:-zero
D:-1.5
Ans: B
56:-Rotor of an induction motor runs always
A:-At synchronous speed
B:-At more than synchronous speed
C:-At less than synchronous speed
D:-In opposite direction to the field
Ans: C
57:-The difference between the synchronous speed and the actual rotor speed is called
A:-Fractional slip
B:-Slip speed
C:-Rotor speed
D:-Actual rotor speed
Ans: B
58:-The slip of an induction motor will be low when
A:-Rotor Resistance is low B:-Friction loss is low
C:-Windage loss is low D:-Rotor resistance is high
Ans: A
59:-The split rings are made of
A:-Brass B:-Gunmetal C:-Bronze D:-Hard drawn copper
Ans: D
60:-Which motor should not be started on no load?
A:-Shunt motor B:-Cumulative compound motor
C:-Series motor D:-Differential compound motors
Ans: C
61:-The barrier potential for a silicon PN junction is _______V.
A:-0.3 V B:-0.7 V C:-0.2 V D:-0.5 V
Ans: B
62:-In which DC generator the armature and field current will be equal?
A:-Shunt B:-Long shunt compound C:-Short shunt compound D:-Series
Ans: D
63:-Which type of starter used to start both shunt and compound DC motor?
A:-Three pointer starter B:-Two point starter C:-DOL starter D:-Star-delta starter
Ans: A
64:-When the speed of alternator increases the frequency?
A:-Decreases B:-Increases C:-Remains same D:-None of the above
Ans: B
65:-Alternators are rated in
A:-KW B:-KWH C:-KVA D:-Full load current
Ans: C
66:-Most widely used transformer oil is
A:-Animal oil B:-Cooking oil C:-Vegetable oil D:-Mineral oil
Ans: D
67:-The line insulators are made up to
A:-Mica B:-Porcelain clay
C:-Asbestos D:-Ceramic
Ans: B
68:-Epoxy compound used with underground cable does not need
A:-Heating B:-Armouring C:-Insulation D:-Core
Ans: A
69:-The chemical used in breather is
A:-Copper sulphate B:-Sodium chloride C:-Silica gel D:-Potassium chloride
Ans: C
70:-Graphite is used in nuclear power plant as a
A:-Fuel B:-Coolant C:-Electrode D:-Moderator
Ans: D
71:-Which of the following power plants is free from environmental problems?
A:-Diesel engine B:-Nuclear power plant C:-Hydro electric power plant D:-Steam power plant
Ans: C
72:-Which type of insulator is used in stay wire?
A:-Egg type B:-Pin type C:-Shackle type D:-Suspension type
Ans: A
73:-Which of the following power plant has the maximum capital cost?
A:-Steam power plant B:-Nuclear power plant C:-Hydro electric power plant D:-Diesel power plant
Ans: B
74:-The working principle of a transformer is
A:-Static induction B:-Self induction C:-Mutual induction D:-None of the above
Ans: C
75:-The colour of neutral wire of a cable is
A:-Red B:-Yellow C:-Orange D:-Black
Ans: D
76:-The amount of matter in a body is called
A:-mass B:-weight C:-density D:-none of these
Ans: A
77:-The rate of change of position in a particular direction is called
A:-speed
B:-velocity
C:-acceleration
D:-none of these
Ans: B
78:-Which one of the following is a basic unit of MS Excel?
A:-Row B:-Column C:-Cell D:-Word
Ans: C
79:-Isolation of fire from the supply of oxygen by blanketing it with foam, sand etc. comes under which fire extinguishing method A:-Starving B:-Smothering C:-Cooling D:-Blanketing
Ans: B
80:-One gallon is
A:-1.546 litres B:-2.546 litres C:-3.546 litres D:-4.546 litres
Ans: D
81:-60 Km/hr into m/sec is
A:-10.66 m/sec B:-12.66 m/sec C:-14.66 m/sec D:-16.66 m/sec
Ans: D
82:-The property of material to be drawn into thin sheets without fracture is
A:-Ductility B:-Malleability C:-Machinability D:-None of these
Ans: B
83:-The multiplication 0.1 × 0.001 is equal to
A:-0.1 B:-0.01 C:-0.001 D:-0.0001
Ans: D
84:-Multiply 6/13 by the reciprocal of 9/16 is equal to
A:-96/117 B:-32/39 C:-54/208 D:-None of these
Ans: B
85:-To increase the range of an ammeter ________ is used.
A:-C.T. B:-multiplier C:-shunt D:-P.T.
Ans: C
86:-Extension of MS Word file is
A:-.doc B:-.xls C:-.text D:-.ppt
Ans: A
87:-Sin`theta` is equal to
A:-Opposite side / adjecent side B:-Adjecent side / hypotenus
C:-Opposite side / hypotenus D:-None of these
Ans: C
88:-The value of 1/tan45 is equal to
A:-0 B:-1 C:-45 D:-1/45
Ans: B
89:-The unit of luminous flux is
A:-lumen B:-candle power C:-lux D:-meter candle
Ans: A
90:-Heat is a form of
A:-Work B:-Power C:-Energy D:-None of these
Ans: C
91:-Conventional representation of 1st angle and 3rd angle projection includes
A:-Two eccentric circles B:-Two concentric circles C:-Two circle of same diameter D:-None of these
Ans: B
92:-700×500×15 mm drawing board designated by
A:-`"D_0"` B:-`"D_1"` C:-`"D_2"` D:-`"D_3"`
Ans: C
93:-594×841 trimmed size of drawing sheet designated by
A:-`"A_0"` B:-`"A_1"` C:-`"A_2"` D:-`"A_3"`
Ans: B
94:-In 3rd angle projection the Top view (plan) is drawing
A:-Right side of elevation B:-Left side of elevation C:-Below the elevation D:-Above the elevation
Ans: D
95:-In 1st angle projection the end view from right side of an object is drawing
A:-Right side of elevation B:-Left side of elevation C:-Right side of plan D:-Left side of plan
Ans: B
96:-Size of copper plate electrode for plate earthing is
A:-60×60 cm×6.3 mm B:-60×60 cm×3.15 mm C:-30×30 cm×6.3 mm D:-30×30 cm×3.15 mm
Ans: B
97:-The angle of isometric axis is
A:-270° B:-120° C:-360° D:-130°
Ans: B
98:-The number of a pentagon is
A:-3 B:-4 C:-5 D:-6
Ans: C
99:-The isometric view of a circle is
A:-Parabola B:-Ellipse C:-Triangle D:-Rectangle
Ans: B
100:-The length of an arrow head is
A:-Same as width B:-Two times of width C:-Three times of width D:-Four times of width
Ans: C
A:-Its voltage regulation
B:-Diode rating
C:-Its filter efficiency
D:-Purity of power output
Ans: D
52:-The function of a commutator in a DC generator is
A:-To change DC to AC
B:-To collect current from conductors
C:-To change AC to DC
D:-To conduct the current to the brushes
Ans: C
53:-The field coils of a DC generator are usually made of
A:-Carbon
B:-Copper
C:-Cast iron
D:-Graphite
Ans: B
54:-In a two point starters the series resistors is required for
A:-To limit the starting current
B:-Starting the motor
C:-To limit the back emf
D:-To give heavy current at starting
Ans: A
55:-In two watt meter method of measuring three phase power one of the wattmeter shows zero reading what would be the value of the power factor in this case
A:-1
B:-0.5
C:-zero
D:-1.5
Ans: B
56:-Rotor of an induction motor runs always
A:-At synchronous speed
B:-At more than synchronous speed
C:-At less than synchronous speed
D:-In opposite direction to the field
Ans: C
57:-The difference between the synchronous speed and the actual rotor speed is called
A:-Fractional slip
B:-Slip speed
C:-Rotor speed
D:-Actual rotor speed
Ans: B
58:-The slip of an induction motor will be low when
A:-Rotor Resistance is low B:-Friction loss is low
C:-Windage loss is low D:-Rotor resistance is high
Ans: A
59:-The split rings are made of
A:-Brass B:-Gunmetal C:-Bronze D:-Hard drawn copper
Ans: D
60:-Which motor should not be started on no load?
A:-Shunt motor B:-Cumulative compound motor
C:-Series motor D:-Differential compound motors
Ans: C
61:-The barrier potential for a silicon PN junction is _______V.
A:-0.3 V B:-0.7 V C:-0.2 V D:-0.5 V
Ans: B
62:-In which DC generator the armature and field current will be equal?
A:-Shunt B:-Long shunt compound C:-Short shunt compound D:-Series
Ans: D
63:-Which type of starter used to start both shunt and compound DC motor?
A:-Three pointer starter B:-Two point starter C:-DOL starter D:-Star-delta starter
Ans: A
64:-When the speed of alternator increases the frequency?
A:-Decreases B:-Increases C:-Remains same D:-None of the above
Ans: B
65:-Alternators are rated in
A:-KW B:-KWH C:-KVA D:-Full load current
Ans: C
66:-Most widely used transformer oil is
A:-Animal oil B:-Cooking oil C:-Vegetable oil D:-Mineral oil
Ans: D
67:-The line insulators are made up to
A:-Mica B:-Porcelain clay
C:-Asbestos D:-Ceramic
Ans: B
68:-Epoxy compound used with underground cable does not need
A:-Heating B:-Armouring C:-Insulation D:-Core
Ans: A
69:-The chemical used in breather is
A:-Copper sulphate B:-Sodium chloride C:-Silica gel D:-Potassium chloride
Ans: C
70:-Graphite is used in nuclear power plant as a
A:-Fuel B:-Coolant C:-Electrode D:-Moderator
Ans: D
71:-Which of the following power plants is free from environmental problems?
A:-Diesel engine B:-Nuclear power plant C:-Hydro electric power plant D:-Steam power plant
Ans: C
72:-Which type of insulator is used in stay wire?
A:-Egg type B:-Pin type C:-Shackle type D:-Suspension type
Ans: A
73:-Which of the following power plant has the maximum capital cost?
A:-Steam power plant B:-Nuclear power plant C:-Hydro electric power plant D:-Diesel power plant
Ans: B
74:-The working principle of a transformer is
A:-Static induction B:-Self induction C:-Mutual induction D:-None of the above
Ans: C
75:-The colour of neutral wire of a cable is
A:-Red B:-Yellow C:-Orange D:-Black
Ans: D
76:-The amount of matter in a body is called
A:-mass B:-weight C:-density D:-none of these
Ans: A
77:-The rate of change of position in a particular direction is called
A:-speed
B:-velocity
C:-acceleration
D:-none of these
Ans: B
78:-Which one of the following is a basic unit of MS Excel?
A:-Row B:-Column C:-Cell D:-Word
Ans: C
79:-Isolation of fire from the supply of oxygen by blanketing it with foam, sand etc. comes under which fire extinguishing method A:-Starving B:-Smothering C:-Cooling D:-Blanketing
Ans: B
80:-One gallon is
A:-1.546 litres B:-2.546 litres C:-3.546 litres D:-4.546 litres
Ans: D
81:-60 Km/hr into m/sec is
A:-10.66 m/sec B:-12.66 m/sec C:-14.66 m/sec D:-16.66 m/sec
Ans: D
82:-The property of material to be drawn into thin sheets without fracture is
A:-Ductility B:-Malleability C:-Machinability D:-None of these
Ans: B
83:-The multiplication 0.1 × 0.001 is equal to
A:-0.1 B:-0.01 C:-0.001 D:-0.0001
Ans: D
84:-Multiply 6/13 by the reciprocal of 9/16 is equal to
A:-96/117 B:-32/39 C:-54/208 D:-None of these
Ans: B
85:-To increase the range of an ammeter ________ is used.
A:-C.T. B:-multiplier C:-shunt D:-P.T.
Ans: C
86:-Extension of MS Word file is
A:-.doc B:-.xls C:-.text D:-.ppt
Ans: A
87:-Sin`theta` is equal to
A:-Opposite side / adjecent side B:-Adjecent side / hypotenus
C:-Opposite side / hypotenus D:-None of these
Ans: C
88:-The value of 1/tan45 is equal to
A:-0 B:-1 C:-45 D:-1/45
Ans: B
89:-The unit of luminous flux is
A:-lumen B:-candle power C:-lux D:-meter candle
Ans: A
90:-Heat is a form of
A:-Work B:-Power C:-Energy D:-None of these
Ans: C
91:-Conventional representation of 1st angle and 3rd angle projection includes
A:-Two eccentric circles B:-Two concentric circles C:-Two circle of same diameter D:-None of these
Ans: B
92:-700×500×15 mm drawing board designated by
A:-`"D_0"` B:-`"D_1"` C:-`"D_2"` D:-`"D_3"`
Ans: C
93:-594×841 trimmed size of drawing sheet designated by
A:-`"A_0"` B:-`"A_1"` C:-`"A_2"` D:-`"A_3"`
Ans: B
94:-In 3rd angle projection the Top view (plan) is drawing
A:-Right side of elevation B:-Left side of elevation C:-Below the elevation D:-Above the elevation
Ans: D
95:-In 1st angle projection the end view from right side of an object is drawing
A:-Right side of elevation B:-Left side of elevation C:-Right side of plan D:-Left side of plan
Ans: B
96:-Size of copper plate electrode for plate earthing is
A:-60×60 cm×6.3 mm B:-60×60 cm×3.15 mm C:-30×30 cm×6.3 mm D:-30×30 cm×3.15 mm
Ans: B
97:-The angle of isometric axis is
A:-270° B:-120° C:-360° D:-130°
Ans: B
98:-The number of a pentagon is
A:-3 B:-4 C:-5 D:-6
Ans: C
99:-The isometric view of a circle is
A:-Parabola B:-Ellipse C:-Triangle D:-Rectangle
Ans: B
100:-The length of an arrow head is
A:-Same as width B:-Two times of width C:-Three times of width D:-Four times of width
Ans: C
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