Last Answer : In capacitor start single-phase motors current in the starting winding leads the voltage.
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101 views
1 answer
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Mar 20, 2018
by
anonymous

What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these
Last Answer : What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these
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100 views
1 answer
asked
Apr 29, 2018
by
anonymous

What are the five types of single phase motors used in the industry?
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79 views
0 answers
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Mar 15, 2018
by
anonymous

Last Answer : In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.
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223 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : If the capacitor of a single-phase motor is short-circuited the motor will not start.
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104 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to improve power factor.
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710 views
1 answer
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Mar 20, 2018
by
anonymous

Stepper motors are used in (1) printers (2) lifts (3) amplifiers (4) oscillators
Last Answer : Stepper motors are used in printers
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68 views
1 answer
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Apr 29, 2018
by
anonymous

Last Answer : Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.
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120 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : Series capacitors are used to compensate for line inductive reactance.
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77 views
1 answer
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Mar 20, 2018
by
anonymous

A relay used for protection of motors against overload is : (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay
Last Answer : D
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547 views
2 answers
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May 8, 2018
by
anonymous

Last Answer : D.C. shunt motors are used for driving machine tools.
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85 views
1 answer
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Mar 20, 2018
by
anonymous

Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these
Last Answer : Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these
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2.8k views
1 answer
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Apr 29, 2018
by
anonymous

Last Answer : Commonly used standard capacitor is concentric cylindrical type.
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92 views
1 answer
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Mar 21, 2018
by
anonymous

Last Answer : In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.
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162 views
1 answer
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Mar 20, 2018
by
anonymous

Which capacitor is used for high frequency?
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78 views
0 answers
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Mar 15, 2018
by
anonymous

Why shunt capacitor is used?
Last Answer : To improve voltage at receiving end and power factor
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94 views
1 answer
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Mar 15, 2018
by
anonymous

Why capacitor bank is used?
Last Answer : In industrial or factory used E.B Power supply must be maintained above 0.90 power factor is compulsory for avoid EB Penalty. So APFC ( automatic Power factor control ) panel is used to maintained balance the load and PF maintained.
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169 views
3 answers
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Mar 15, 2018
by
anonymous

Last Answer : If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.
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169 views
1 answer
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Mar 20, 2018
by
anonymous
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Damper winding is provided in 3 phase synchronous motors to :
Last Answer : Damper winding is provided in 3 phase synchronous motors to : provide starting torque and prevent hunting
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93 views
1 answer
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Apr 29, 2018
by
anonymous

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then (A) the flux is constant (B) the flux first decreases and then increases in ... increases and decreases in the opposite direction with the same magnitude (D) current flows through the rotor
Last Answer : In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then the flux first decreases and then increases in the same direction
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95 views
1 answer
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Apr 28, 2018
by
anonymous

Last Answer : The starting winding of a single-phase motor is placed in stator.
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115 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.
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234 views
1 answer
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Mar 20, 2018
by
anonymous

Slot harmonics are reduced in induction motors by using (A) fractional-pitch windings (B) fractional-slot windings (C) integral-slot windings (D) distributed windings
Last Answer : Slot harmonics are reduced in induction motors by using fractional-slot windings
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79 views
1 answer
asked
Apr 28, 2018
by
anonymous

Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as (A) One-third of their synchronous speed (B) One-fifth of their synchronous speed (C) One-seventh of their synchronous speed (D) One-ninth of their synchronous speed
Last Answer : Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as One-seventh of their synchronous speed
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102 views
1 answer
asked
Apr 28, 2018
by
anonymous

Which of the following test is usually conducted to determine the efficiency of traction motors ? (A) Field’s test (B) Swinburne’s test (C) Hopkinson’s test (D) Retardation test.
Last Answer : Which of the following test is usually conducted to determine the efficiency of traction motors ? (A) Field’s test (B) Swinburne’s test (C) Hopkinson’s test (D) Retardation test.
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248 views
1 answer
asked
Apr 28, 2018
by
anonymous

Which of the following motors is being extensively used in servo applications ? A. AC motor B. Field controlled dc motor C. Armature controlled dc motor D. None of these
Last Answer : Which of the following motors is being extensively used in servo applications ? A. AC motor B. Field controlled dc motor C. Armature controlled dc motor D. None of these
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203 views
1 answer
asked
Apr 26, 2018
by
anonymous

In case of conductively compensated D.C. series motors, the compensating winding is provided?
Last Answer : In case of conductively compensated D.C. series motors, the compensating winding is provided in series with armature winding.
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97 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.
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250 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : A direct online starter is used for starting motors up to 5 H.P.
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83 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : When two D.C. series motors are connected in parallel, the resultant speed is normal speed.
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378 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : In D.C. shunt motors as load is reduced the speed will remain almost constant.
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145 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : Differentially compound D.C. motors can find applications requiring low starting torque.
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125 views
1 answer
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Mar 20, 2018
by
anonymous
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Last Answer : Most of the fractional horsepower motors have either plain or sleeve bearings.
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92 views
1 answer
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Mar 20, 2018
by
anonymous
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Last Answer : As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for sound equipment.
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115 views
1 answer
asked
Mar 20, 2018
by
anonymous

What is the difference between synchronous and asynchronous motors?
Last Answer : The motor which rotates at constant speed is called synchronous motor. And that constant speed is called as synchronous speed. And the motor which does not rotates at constant speed are called asynchronous motor. Asynchronous motor is also called as Induction motor.
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143 views
1 answer
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Mar 15, 2018
by
anonymous

SINGLE PHASE INDUCTION MOTORS MCQ
Last Answer : 101. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on (a) running winding (b) rotor winding (c) field winding (d) compensating winding Ans: a ... motor is usually reduced by using (a) gearing (b) belts (c) brakes (d) chains Ans: a
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3 answers

Capacitors
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
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181 views
2 answers
asked
Apr 19, 2020
by
anonymous
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Why capacitors are used to improve power factor?
Last Answer : Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.
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183 views
3 answers
asked
Aug 18, 2019
by
anonymous

State any four types of capacitors.
Last Answer : Types of capacitors: i) Air capacitor ii) Paper capacitor iii) Mica capacitor iv) Ceramic capacitor v) Electrolytic capacitor vi) Poly-carbon capacitor
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103 views
1 answer
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Sep 4, 2018
by
anonymous

The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as
Last Answer : The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as non-linear circuit.
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335 views
1 answer
asked
Mar 25, 2018
by
anonymous

Capacitors for power factor correction are rated in?
Last Answer : Capacitors for power factor correction are rated in kVAR.
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84 views
1 answer
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Mar 25, 2018
by
anonymous

Last Answer : For measurements on high voltage capacitors, the suitable bridge is Schering bridge.
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312 views
1 answer
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Mar 21, 2018
by
anonymous

Last Answer : In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.
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185 views
1 answer
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Mar 20, 2018
by
anonymous
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103 views
0 answers
asked
Mar 20, 2018
by
anonymous

Last Answer : Series capacitors on transmission lines are of little use when the load VAR requirement is small.
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187 views
1 answer
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Mar 20, 2018
by
anonymous

What are the different types of capacitors?
Last Answer : (b) is facilitated by telomerase
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88 views
1 answer
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Mar 15, 2018
by
anonymous

Which capacitors are suitable for DC filter circuits?
Last Answer : Electrolytic capacitors are suitable for DC filter circuits.
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83 views
1 answer
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Mar 8, 2018
by
anonymous

Last Answer : To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.
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131 views
1 answer
asked
Mar 20, 2018
by
anonymous
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Last Answer : Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because it has low starting as well as running currents at relatively high power factor.
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74 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a ceiling fan employing capacitor run motor secondary winding surrounds the primary winding.
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101 views
1 answer
asked
Mar 20, 2018
by
anonymous
