Description : When a megohmmeter is used to test the dielectric strength of wire insulation, the initial dip of the pointer toward 'zero' is caused by _____________. A. good insulation B. the leakage of ... of dirty insulation C. the capacitance of the circuit D. the dielectric absorption effect of the insulation
Last Answer : Answer: C
Description : A wire loop is moved parallel to a uniform magnetic field. The induced emf in the loop: a. depends on the shape b. depends on area c. depends on nature of loop d. zero
Last Answer : d. zero
Description : A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part a. remains the same b. is doubled c. is halved d. becomes zero
Last Answer : a. remains the same
Description : An infinitely long wire carries a current of three amps. The magnetic field outside the wire: w) points radially away from the wire x) points radially inward y) circles the wire z) is zero.
Last Answer : ANSWER: Y -- CIRCLES THE WIRE
Description : A COPPER strip is placed in one compartment of a voltaic cell and a wire connects this strip to a piece of metal in the other compartment through a voltmeter. If the voltmeter reads zero, the other piece of metal is: w) zinc x) mercury y) silver z) copper
Last Answer : ANSWER: Z -- COPPER
Description : What is the voltage of a neutral wire ?
Last Answer : Neutral cable voltage 0
Description : The current (I) and voltage (V) graphs for a given metallic wire at two different temperature `(T_(1))` and `(T_(2))` are shown in fig. It is conclude
Last Answer : The current (I) and voltage (V) graphs for a given metallic wire at two different temperature `(T_(1))` and `(T_( ... `T_(1)=T_(2)` D. `T_(1)gt2T_(2)`
Description : What is the function of a fuse wire? (a) To prevent an unduly high electric current from passing through a circuit (b) To increase the current supply (c) To decrease the current supply (d) To stabilise the voltage
Last Answer : Ans:(a)
Description : If the total source voltage of the three-wire distribution system shown in the illustration is 240 volts, what is the voltage across load L5? [ NOTE: Kirchhoff's voltage and current laws apply ] EL-0075 A. 110.4 volts B. 112.2 volts C. 113.0 volts D. 114.8 volts
Last Answer : Answer: D
Description : The distance between a generator and its load is 100 feet. What would be the approximate total voltage drop across a two wire supply cable if the current were 5.5 amperes and the resistance of the wire were 2.525 ohms per 1,000 feet? A. 0.5 volts B. 1.38 volts C. 1.90 volts D. 2.77 volts
Description : If the total source voltage of the three-wire distribution system shown in the illustration is 240 volts, what is the voltage across load L1? [NOTE: Kirchhoff's voltage and current laws apply.] EL-0075 A. 110.4 volts B. 112.2 volts C. 113.3 volts D. 114.8 volts
Description : If the total source voltage of the three-wire distribution system shown in the illustration is 240 volts, what is the voltage across load L2? [NOTE: Kirchhoff's voltage and current laws apply.] EL-0075 A. 110.4 volts B. 112.2 volts C. 113.0 volts D. 114.8 volts
Description : If the total source voltage of the three-wire distribution system shown in the illustration is 240 volts, what is the voltage across load L3? [NOTE: Kirchhoff's voltage and current laws apply.] EL-0075 A. 110.4 volts B. 112.2 volts C. 113.0 volts D. 114.8 volts
Last Answer : Answer: B
Description : When troubleshooting a console circuit card suspected of being faulty, the last step would be to _______________. A. check the fuses and voltage levels of all power supplies in the console B. clean dust ... -on types D. substitute a new or repaired spare card and check the operation of the circuit
Description : If the total source voltage of the three-wire distribution system shown in the illustration is 240 volts, what is the voltage across load L4? EL-0075 A. 110.4 volts B. 112.2 volts C. 113.0 volts D. 114.8 volts
Last Answer : Answer: A
Description : The frequency of an alternator at a given RPM is determined by the _____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage
Description : The frequency output of an operating alternator is controlled by the _____________. A. relative speed of the rotor poles B. number of turns of wire in the armature coil C. strength of the magnets used D. output voltage
Description : One factor that determines the frequency of an alternator is the ____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage
Description : Which of the following precautions should be taken when troubleshooting various power circuits using a common solenoid-type mechanical voltage tester (wiggins)? A. Never use this tester on circuits greater ... voltage expected in the circuit in order to prevent damage from an off-scale reading.
Description : The secondary coil of a transformer in which the voltage is stepped down are usually made of thicker wire than primary. Why?
Last Answer : The secondary coil is made of thicker wire to sustain larger electric current.
Description : Change in length and cross-sectional area of metal wire changes A. current B. voltage C. resistance D. magnetic effect
Last Answer : resistance
Description : How many voltage outputs are available from a two-phase three-wire alternator?
Last Answer : Three.
Description : As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only (a) 31.25 percent of copper (b) 33.3 percent of copper (c) 66.7 percent of copper (d) 125 percent of copper
Last Answer : (a) 31.25 percent of copper
Description : Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is (a) 25 percent (b) 50 percent (c) 75 percent (d) 100 percent
Last Answer : (b) 50 percent
Description : The function of the earth wire in an extra high voltage line is to?
Last Answer : The function of the earth wire in an extra high voltage line is to provide a shield to the phase conductors from direct lightning stroke.