Technical MCQs

1. In an induction motor, the difference between the synchronous motor and the actual speed is known as: (A) Lag (B) Slip (C) Back lash (D) Regulation 2. In actual induction motor, the slip is generally: (A) 1 to 3% (B) 2 to 4% (C) 3 to 5% (D) 4 to 6% 3. An induction cannot have maximum speed of: (A) 3000 rpm (B) 2000 rpm (C) 1000 rpm (D) 500 rpm 4. What will be the rotor frequency, when a motor is switched on? (A) Same as slip frequency (B) Zero (C) Same as supply frequency (D) 10 Hz 5. The starting current in a squirrel cage induction motor is: (A) 1 to 2 times the rated voltage (B) 5 to 7 times the rated voltage (C) Equal to rated voltage (D) Half of the rated voltage 6. Which rotor is used in a 3 phase slip ring induction motor? (A) Wound rotor (B) Short circuited rotor (C) Double cage rotor (D) All 7. In induction motors, the phenomenon of crawling occurs due to: (A) High load (B) Jammed bearings (C) Harmonics developed in the motor (D) Low voltage 8. If the supply voltage is chan

1. in power generation, for economy: (A) Load factor should be high (B) Diversity factor should be high (C) Load factor and diversity factor should be low (D) Plant utilization factor 2. Which category of consumers can provide highest load factor: (A) A cold storage plant (B) A domestic consumer (C) A continuous process plant (D) A steel melting unit using arc furnace 3. Generally a load of consumer is measured in terms of: (A) Amperes (B) kW (C) Volts (D) Ampere hour 4. Increases load during summer months is due to: (A) Increased use of fans and air conditioners (B) Increased business activity (C) Vacations in institutions (D) Increased water supply 5. If the base load of a system is the same as the maximum demand, the load factor will be: (A) Infinity (B) Zero (C) 1 percent (D) 1 6. Due to 1 ton air-conditioner, load is nearly: (A) 1kW to 2kW (B) 100 W (C) 500 W (D)   400 W 7. Due to a ceiling fan, load is nearly: (A) 10 W (B) 20 W (C) 30 to 40 W (D) 40 to 50 W 8. From the following,

1. In case of mica, dielectric strength can be expected to be more than: (A) 1000 kV/mm (B) 500 kV / mm (C) 1500 kV / mm (D) None 2. Which of the following dielectric material is not preferred for high frequency applications? (A) Polystyrene (B) Teflon (C) Butyl rubber (D) Polyethylene 3. Normally polar dielectrics are used for: (A) Microwaves (B) Dc and power frequencies (C) High frequencies (D) None 4. from the following which is polar dielectric: (A) Polyethylene (B) Nylon (C) Quartz (D) Teflon 5. Which is non-polar dielectric? (A) Castor oil (B) Plasticized cellulose acetate (C) Phenolic plastics (D) Polystyrene 6. In liquid dielectric which impurity has significant effects in reducing the breakdown strength? (A) Ionic impurities (B) Moisture (C) Dissolved gases (D) Dust 7. The break down voltage V and gap d is normally related with other as: (A) V=kd n (B) V=kd 2 (C) d= kV 2 (D) None 8. A good dielectric should not have the following property: (A) Freedom from gaseous inclusion (B

1. Usually carbon arc lamps are used in: (A) Street lighting (B) Photography (C) Domestic lighting (D) Cinema projectors 2. Solid angle has the unit: (A) Radian (B) Candela (C) Solid angle (D) Steradian 3. Candela is a unit of: (A) Wavelength (B) Luminous flux (C) Luminous intensity (D) None 4. Luminous flux has the unit: (A) Lumen (B) Lux (C) Candela (D)  Steradian For More related MCQs: Electrical Engineering MCQs/Quizzes 5. in which, the highest level of illumination is needed: (A) Hospital wards (B) Railways platforms (C) Bedrooms (D) Proof readings 6. In which the lowest level of illumination is needed: (A) Auditorium (B) Railway platforms (C) Fine engraving (D) Displays 7. Which lamp is cheapest for the same wastage? (A) GLS lamps (B) Fluorescent tube (C) Mercury vapor lamp (D) Sodium vapor lamp 8. Which of the following has the unit Lumen/ watt? (A) Brightness (B) Light flux (C) Luminous efficiency (D) Light flux 9. Candela is the unit of which: (A) Brightness (B) Luminous effic