Power Generator

101. The brush voltage drop in a dc machine is about

1. 0.1V
2. 2V
3. 10V
4. 20V

View answer

102. The common 9v flat battery for transistor radio has ___________ cells connected ins series

1. 12
2. 3
3. 6
4. 9

View answer

103. The common dry cell, which is a primary cell having a carbon positive electrode and a zinc negative electrode in an electrolyte of sal ammoniac and a depolarizer

1. Leclanche cell
2. Faure storage cell
3. Lead acid cell
4. Lithium cell

View answer

104. The commutator pitch for a simplex lap winding is equal to

1. number of poles of the machines
2. 1
3. poles pairs
4. 2

View answer

105. The core type transformer is generally suitable for

1. high voltage and small output
2. low voltage and high output
3. high voltage and high output
4. low voltage and low output

View answer

106. The core type transformer provides

1. much longer magnetic pattern
2. lesser average length per turn
3. shorter magnetic path
4. longer magnetic path

View answer

107. The coupling field between electrical and the mechanical systems of a dc machine is

1. electric field
2. both electric and magnetic fields
3. magnetic field
4. electromagnetic field

View answer

108. The current in armature conductors of a dc machine is

1. pure dc
2. ac
3. pulsating dc
4. pure dc plus pulsating dc

View answer

109. The deciding factor in the selection of a dc motor for a particular application is its characteristics

1. speed torque
2. torque armature current
3. speed armature current
4. speed

View answer

110. The demand for a large increase in torque of a dc series motor is met by a

1. large decrease in current
2. large increase in speed
3. large decrease in speed
4. small decrease in speed

View answer