Page 358 - GMAT 2017b_Neatb

Electronics Information Test 1

20. A compound motor usually has 27. The following equipment is required for a “2-line
(A) only a shunt field return-call” electric bell circuit:
(B) both a shunt and a series field (A) 2 bells, 2 metallic lines, 2 ordinary push buttons,
(C) only a series field and 1 set of batteries
(D) no brushes. (B) 2 bells, 2 metallic lines, 2 return-call push
buttons, and 2 sets of batteries
21. In lights controlled by three-way switches, the (C) 2 bells, 2 metallic lines, 2 return-call push
switches should be treated and put in as buttons, and a set of batteries
(A) flush switches (D) 2 bells, 2 metallic lines, 1 ordinary push button,
(B) single-pole switches 1 return-call push button, and 1 set of batteries
(C) three double-pole switches
(D) three-pole switches

22. When working on live 600-volt equipment where
rubber gloves might be damaged, an electrician should
(A) work without gloves
(B) carry a spare pair of rubber gloves
(C) reinforce the fingers of the rubber gloves with
rubber tape. 1 2 3 4
(D) wear leather gloves over the rubber gloves.
28. The standard coupling above for rigid electrical
23. A “mil” measures a(n) conduit is
(A) eighth of an inch. (A) 1
(B) millionth of an inch (B) 2
(C) thousandth of an inch. (C) 3
(D) ten-thousandth of an inch. (D) 4

29. Metal cabinets used for lighting circuits are grounded
to
(A) eliminate electrolysis
LAMPS
GENERATOR (B) ensure that the fuse in a defective circuit will
blow
(C) reduce shock hazard
EACH LAMP TAKES 1 AMPERE
(D) simplify wiring.
24. The current in the wire at the point indicated by the
arrow above is 30. Low Potential is a trade term that refers to
(A) 1 ampere (A) 700 volts
(B) 2 amperes (B) 600 volts or less
(C) 3 amperes (C) 1,200 volts
(D) 4 amperes. (D) 900 volts
25. If a fuse of higher than the required current rating is 31. The purpose of having a rheostat in the field circuit of
used in an electrical circuit, a DC shunt motor is to
(A) better protection will be afforded. (A) control the speed of the motor
(B) the fuse will blow more often since it carries more (B) minimize the starting current
current. (C) limit the field current to a safe value
(C) serious damage may result to the circuit from (D) reduce sparkling at the brushes
overload.
(D) maintenance of the large fuse will be higher 32. A polarized plug generally has
(A) two parallel prongs of the same size
26. The electrical contacts in the tuner of a television set (B) prongs at an angle with one another
are usually plated with silver. Silver is used to (C) magnetized prongs
(A) avoid tarnish (D) prongs marked plus and minus
(B) improve conductivity
(C) improve appearance
(D) avoid arcing

361