If the no load voltage of a certain generator is 220V and the rated load voltage is 200V, then the voltage regulation is: a. 1% b. 10% c. 20V d. 9%
Description : When 220V dc shunt alternator generating the voltage at rated value. If direction of rotation is reversed, then alternator will a) Build up its voltage with same polarity b) Build up its voltage with opposite polarity c) No build up of voltage d) None
Last Answer : Ans: No build up of voltage
Description : A dc shunt generator has a speed of 800 rpm when delivering 20 A to the load at the terminal voltage of 220V. If the same machine is run as a motor it takes a line current of 20A from 220V supply. The speed of ... . (B) more than 800 rpm. (C) less than 800 rpm. (D) both higher or lower than 800 rpm.
Last Answer : (C) less than 800 rpm.
Description : The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : (A) 34.64 kVA (B) 75 kVA (C) 20 kVA (D) None of the above
Last Answer : The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : 34.64 kVA
Description : The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage ____________. A. droop B. drop C. dip D. regulation
Last Answer : Answer: C
Description : The power factor of an AC generator operating singularly is determined by the __________. A. connected load B. prime mover speed C. field excitation D. generator's rated voltage
Last Answer : Answer: A
Description : The power factor at which a paralleled AC generator operates is usually adjusted by the _____________. A. connected load B. prime mover speed C. field excitation D. generator's rated voltage
Description : Determine the empirical formula of an oxide of iron that has 69.9% iron & 30.1% dioxygen by mass. -General Knowledge
Last Answer : Given: % of iron by mass = 69.9 % % of oxygen by mass = 30.1 % Relative moles of iron in iron oxide: = Percentage of iron by mass/Atomic mass of iron = 69.9/55.85 = 1.25 Relative moles of oxygen in iron ... to oxygen: = 1.25: 1.88 = 1:1.5 = 2:3 ∴ The empirical formula of the iron oxide is Fe2O3.
Description : If the expected time of completion of a project is 60 weeks with a standard deviation of 5 weeks, the probability of completing the project in 50 weeks and 65 weeks respectively will be (A) 2.3% and 84.1% (B) 97.7% and 84.1% (C) 97.7 % and 15.9% (D) 15.9% and 97.7%
Last Answer : (A) 2.3% and 84.1%
Description : a) For a transmission line, Find SWR and reflection coefficient R if, i. There is no reflected voltage. ii. Reflected voltage and incident voltage is equal. iii. If reflected voltage=20V and incident voltage=10V. iv. If reflected voltage=10V and incident voltage =20V.
Last Answer : reflection coefficient R=Vr/Vi i. There is no reflected voltage. i.e,Vr=0 R=0 SWR= 1+R/1-R=1 ii. Reflected voltage and incident voltage is equal. Vr=Vi; R=1 SWR= 1+R/1-R=1+1/1-1=infinity iii. If reflected ... and incident voltage =20V. Vr=10 and Vi=20 R=10/20=0.5 SWR= 1+R/1-R=1+.5/1-.5=3
Description : If 1-phase voltage is 220V, why is 3-phase 440V and not 660V ?
Last Answer : Phase voltage =220v /( phase to neutral) Line voltage = 380 v ( phase to phase) Phase angle difference 120° So when two phases reach vmax +ve I.e. (+220v) + (+220v) = 440v that time due ... these event happen very fast. Hence we have 440 v only in three phase motor. √3.phase voltage= 380 v.
Description : The speed of a d.c. shunt motor at no-load is (A) 5 to 10% (B) 15 to 20% (C) 25 to 30% (D) 35 to 40% higher than its speed at rated load.
Last Answer : (A) 5 to 10%
Description : What is a typical ARC voltage setting when welding with the TIG (GTAW) process? a) 18-20V b) 24-26V c) 10-12V d) 70-90V
Last Answer : c) 10-12V
Description : An a.c series circuit has resistance of 10ohm, inductance of 0.1H and capacitance of 10µf, voltage applied to circuit is 200V. find (i) Resonant frequency (ii) Current at resonance (iii) Power at resonance
Last Answer : Solution: For RLC series circuit
Description : The rated temperature rise of an electric motor is the _____________. A. average temperature at any given latitude B. normal temperature rise above the standard ambient temperature at rated load ... D. permissible difference in the ambient temperature of the motor due to existing weather conditions
Last Answer : Answer: B
Description : As shown in the illustration, when the 'speed control' system is in 'SPLIT' _______________. EL-0096 A. Relays #1, #5 and #8 are not used B. the 'slew rated controller' is grounded through Relay ... E/P converters' are bypassed and air is fed directly to the governors via the 'load sharing valve'
Description : Which of the following is a better investment ? (A) 10%, Rs. 100 shares at Rs. 120. (B) 9%, Rs. 100 shares at Rs. 110.
Last Answer : Which of the following is a better investment ? (A) 10%, Rs. 100 shares at Rs. 120. (B) 9%, Rs. 100 ... B. B C. Both (A) and (B) D. Data insufficient
Description : Livestock How much of the total GNP is shared by livestock? A. 9% B. 10% C. 11% D. 12%
Last Answer : ANSWER: C
Description : How much of the total GNP is shared by livestock? A. 9% B. 10% C. 11% D. 12%
Description : A portfolio comprises of two stocks A and B. Stock A gives a return of 8%and stock B gives a return of 7%. Stock A has a weight of 60% in the portfolio. What is the portfolio return? A. 9% B. 11% C. 10% D. 8%
Last Answer : D. 8%
Description : The following solutions are isotonic (same osmolarity as the plasma): a. Harman's solution b. 0.9% saline c. 10% mannitol d. 5% glucose
Last Answer : . 5% glucose
Description : What is the contribution of Animal Husbandry Sector in the agricultural growth ? (A) 10% (B) 12% – 15% (C) 7% – 9% (D) 5%
Last Answer : (C) 7% – 9%
Description : Rice covers how much % of total arable area of world (a) 5% (b) 6% (c) 9% (d) 10%
Last Answer : (d) 10%
Description : Maximum percentage of longitudinal steel in a column should be less than [ A ] 6% [ B ] 8% [ C ] 9% [ D ] 10%
Last Answer : [ B ] 8%
Description : Gross assets are Rs.1,01,000, fictitious assets Rs.350 are included in the gross assets. External liabilities are Rs.7,500. 6% prefer share capital is Rs.45,000. Equity capital is 4,500 equity shares of Rs.10 each fully ... . The Net Asset Value Per share is A Rs.11 B Rs.10.70 C Rs.15 D Rs.20
Last Answer : Rs.10.70
Description : A two -winding single phase transformer has a voltage regulation of 4.5% at full - load and unity power -factor. At full -load and 0.80 lagging power-factor, the voltage regulation will be: (A) 4.5% (B) less than 4.5% (C) more than 4.5% (D) none of the above
Last Answer : A two -winding single phase transformer has a voltage regulation of 4.5% at full - load and unity power -factor. At full -load and 0.80 lagging power-factor, the voltage regulation will be: more than 4.5%
Description : Arun sold two napkins at same price.He earned 10% profit on one napkin and suffered 10% loss on the other, what was his overall profit/loss percentage? a)No profit no loss b)1% profit c)1% loss d)None of these
Last Answer : c)1% loss
Description : Turn ratio of a transformer is 5. If 220 V AC is applied to its primary coil, voltage in the secondary coil will be: a. 44V b. 4.4 V c. 220V d. 1100V
Last Answer : c. 220V
Description : A lamp of 100W at 200V is supplied current at 100 volts. It will be equivalent to the lamp of: a. 50W b. 40W c. 25W d. 10W
Last Answer : A lamp of 100W at 200V is supplied current at 100 volts. It will be equivalent to the lamp of: 25W
Description : Two 100W, 200V lamps are connected in series across a 200V supply. The total power consumed by each lamp will be in Watts
Last Answer : 4800
Description : A vessel is equipped with two ship's service generators. Generator #1 is rated at 900 kw and generator #2 is rated at 600 kw. During parallel operation, with a hotel load of 1,000 kw, what should be the kw load on generator #2? A. 100 kw B. 400 kw C. 500 kw D. 600 kw
Description : Two paralleled alternators are operating near rated load. If one trips out mechanically, which of the listed actions should be taken FIRST? A. Restart the tripped machine immediately. B. Strip the board ... circuits. C. Start the emergency generator. D. Transfer all vital loads to the emergency bus.
Description : A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is (A) magnetizing (B) demagnetizing (C) cross-magnetizing (D) ineffective
Last Answer : A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is demagnetizing
Last Answer : In a separately excited generator supplying rated load the armature reaction is always present.
Description : One method of testing for a reversed shunt field coil in a DC generator or motor is by connecting the field to a direct current source, at reduced field rated voltage, and test for ... placed near each field C. test lamp across adjacent fields D. copper jumper across the interpole connections
Description : Why the earthing transformer primary voltage is 16.5 kV rated in main generator even though actual voltage during the E/F is root 3 times less?
Last Answer : The transformer should not saturate during E/F otherwise it will cause ferroresonance with the GT winding capacitance. Dangerous O/V and neutral shifting will occur. During loss of load or field ... saturation. Saturation can also occur due to point on wave of application causing flux doubling.
Description : A 500 MW, 3-phase, Y-connected synchronous generator has a rated voltage of 21.5 kV at 0.85 p.f. The line current when operating at full load rated conditions will be (A) 13.43 kA (B) 15.79 kA (C) 23.25 kA (D) 27.36 kA
Last Answer : A 500 MW, 3-phase, Y-connected synchronous generator has a rated voltage of 21.5 kV at 0.85 p.f. The line current when operating at full load rated conditions will be 15.79 kA
Description : The voltage regulation of an alternator having 0.75 leading p.f. load, no-load induced e.m.f. of 2400V and rated terminal voltage of 3000V is ————————————— A) 20% B) —20% C) 150 D) -26.7
Last Answer : -20
Description : The % of ‘K’ in Extracellular fluid is about (A) 1% (B) 2 to 3% (C) 10% (D) 15%
Last Answer : Answer : A
Description : Energy transfer from one traphic level to other in a food chain is (a) 10% (b) 20% (c) 1% (d) 2%
Last Answer : Ans. ((a))
Description : An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is: (A) 9.21 (B) 4.605 (C) 100 (D) 0.001
Last Answer : (B) 4.605
Description : The Percentage of Water used for Drinking in the world is? A. 1% (Answer) B. 10% C. 3% D. 5%
Last Answer : A. 1% (Answer)
Description : Decrease in field strength on top of Mount Everest is A. 10% B. 5% C. 1% D. 0.3%
Last Answer : 0.3%
Description : Suppose an investment of $100 has grown to $110 in one year. What is the return on investment? (A) 0.1% (B) 1.0% (C) 10% (D) none of these
Last Answer : (C) 10%
Description : A well designed transformer loses power under A. 10% B. 1.20% C. 0.1% D. 20%
Last Answer : 0.1%
Description : Energy transfer from one trophic level to other, in a food chain, is (a) 10% (b) 20% (c) 1% (d) 2%
Last Answer : (a) 10%
Description : How much percentage of the body water by weight is in the blood plasma. a. 1% b. 5% c. 10% d. 15%
Last Answer : 5%
Description : What map unit (centimorgan) is adopted in the construction of genetic maps? (a) A unit of distance between genes on chromosomes, representing 50% cross over. (b) A unit of distance between two ... 100% cross over. (d) A unit of distance between genes on chromosomes, representing 1% cross over.
Last Answer : (d) A unit of distance between genes on chromosomes, representing 1% cross over.
Description : Women work two-thirds of the world’s working hours, produce half of the world’s food and yet earn only 10% of the world’s income and own less than 1% of the world’s property. It is a matter of a. Economical. b. Gender. c. Sociological. d. All of the above.
Last Answer : b. Gender.
Description : Which of the following is a constituent of vinegar? (A) Around 10% alcohol (B) Around 1% acetic acid (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : Pick out the wrong statement. (A) The annual depreciation rate for machinery and equipments in a chemical process plant is about 10% of the fixed capital investment (B) Annual depreciation rate ... chemical industry, research and development cost amounts to about 15% of net sales realisation (NSR)
Last Answer : (D) In a chemical industry, research and development cost amounts to about 15% of net sales realisation (NSR)